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Civil Engineering/Questions Answered by Expert Arshad Khan
| Subject | Date Asked |
| Tank foundation on piles | 2/8/2012 |
| Q: I have a steel water tank to be checked.The diameter of the tank is 12m & having a total weight of ... A: I am assuming that the base of the tank is self-supporting, i.e. all the 1200 tonnes will be ... | |
| Deck Slab - Steel | 2/8/2012 |
| Q: Salaam Alaikum Dear Sir, I have a doubt regarding Deck Slab on Steel Deck... I want to know ... A: This depends on whether you use proprietary profiled sheet decking (such as Comflor- see ... | |
| Stiffness Reduction & Property Modifiers | 1/26/2012 |
| Q: as i understand from ACI code, you need reduced stiffness for 3 purposes:- 1) Vertical Deflections ... A: Before asking me a question I would encourage you to please search my past answers, where you would ... | |
| Earthquake Drift Limits | 1/18/2012 |
| Q: IN ASCE - 2005 commentary, the drift combination is defined for WIND as D+0.5L+0.7W (0.7W to reduce ... A: Normally you do not apply the reduction factor in the combo, but look at the output drifts and then ... | |
| Holes through plinth beams | 1/16/2012 |
| Q: in a residential house in the city, suppose to bring drainage pipes and rain water pipes by cutting ... A: This depends on how deep the plinth beams are and what diameter and location of the holes are. If ... | |
| pile reinforcement | 1/15/2012 |
| Q: My question is what is 'spacer bar' and its function in pile cage reinforcement? the design is as ... A: Spacer bar is usally specified where you have 2 or more layers of rebar next to each other and you ... | |
| Corrosion protection | 12/30/2011 |
| Q: How to protect metal from corrosion ? A: There are many ways this can be done, such as cathodic protection, painting, galvanising, etc, etc. ... | |
| Load transfer to beams | 12/24/2011 |
| Q: sir, how to calculate the total load transfer to the beam in a structure. A: You work out the self weight of any slabs and beams spanning on to the beams, and the imposed loads ... | |
| how to model truncated dome by finite element method | 12/22/2011 |
| Q: i try to analyze a truncated dome using finite element method but i got some difficulties on how to ... A: If you had browsed my past answers you would have found this, and the earlier description of how to ... | |
| Flat slab detailing & punching shear | 12/21/2011 |
| Q: I have two questions regarding flat slab : 1.In the preparation of drawing for flat slab, i use mesh ... A: 1. Yes, this is acceptable, so long as you ensure proper lap between mesh and additional rebar. You ... | |
| Wind Loading on Lattice Structure | 12/17/2011 |
| Q: I have got a structure to be verified, this structure is equipment support and a lattice structure. ... A: Wind loading on a lattice structure is complicated due to local turbulance, vortices, suction, etc ... | |
| Bar bend diameter problem | 12/14/2011 |
| Q: In ACI code the standard bar bend radius for #10 bar is 8db. I want to ask what are the consequences ... A: This has two possible implications: 1. The bar could have developed cracks or strain hardening ... | |
| analysis part | 12/13/2011 |
| Q: sir, atleasr u cud just guide about the analysis part, pls. atleast provide me with what i m ... A: You start by working out the loads, as per my earlier Q & A:Sir,I have to submit a minor project on ... | |
| EMBDEDED CONNECTIOND DETAILS | 12/13/2011 |
| Q: can you please mention design examples, book or references for the case below:- I have steel ... A: I presume the W33 is a typo? I do not know of any references, but I would embedd the steel column ... | |
| Horse shoe tunnel area calculate | 12/10/2011 |
| Q: How to calculate horse shoe type tunnel x-sectional area. please tell with example Regards sanjay ... A: If you had browsed my past answers you would have found this: QUOTE The best way to do this is to ... | |
| WIND LOAD DRIFTS | 12/9/2011 |
| Q: I want to inquire about the drift limits in codes. FOr example in UBC-97, drift limits are based on ... A: This is the usual statistical probability used in most codes- for example the acceptance of 28 days ... | |
| WIND LOAD DRIFTS | 12/8/2011 |
| Q: I want to inquire about the drift limits in codes. FOr example in UBC-97, drift limits are based on ... A: Wind drift limits are similar to those for seismic, except that there will be no R factors, so you ... | |
| UDL v point load on a slab | 12/8/2011 |
| Q: Mr Khan In my line of work I often need to know the capacity that a reinforced concrete slab will ... A: Sorry, I had assumed that the slabs were suspended/upper storey. For ground-bearing slabs, the ... | |
| UDL v point load on a slab | 12/8/2011 |
| Q: Mr Khan In my line of work I often need to know the capacity that a reinforced concrete slab will ... A: This very much depends on the relative geometry of the slab/span and whether it is one-way or ... | |
| Eccentric footing | 12/7/2011 |
| Q: If column is not in center of footing net what is the probleam A: In that case you have what is called an "eccentric footing", so that the net pressure below the ... | |
| design of seismic building | 12/5/2011 |
| Q: Assalamualiakum Sir! Plz sir help me regarding a very major problem.. Sir am ... A: Strictly speaking, you should do dynamic amalysis for both options, but if you are running out of ... | |
| about shear | 12/3/2011 |
| Q: what is shear? A: For any gravity loading on a beam, the shear is the vertical reaction at the support, or varying ... | |
| best options for 24m long span beams | 11/14/2011 |
| Q: good day, sir,we are designing commercial building in India. In which, there are 24m long span beams ... A: Technically, I would say that only options 1, 2 and 3 should be considered- there is not much ... | |
| design of concrete structures | 11/13/2011 |
| Q: Sir,I have to submit a minor project on design of high rise building .how the dead load is estimated ... A: Fot calculating overall building loads/weight, you need to assess the self (dead) weight of the ... | |
| Eccentric footing-2 | 11/4/2011 |
| Q: SIR, this one is second attachment A: Based on the info provided, even if there was no eccentricity, the UDL pressure works out at 370 ... | |
| Steel section size | 11/4/2011 |
| Q: Can you please give me a simple way of checking the size of a section of steel for bending and ... A: You have not given me enough information to give you a precise answer, as I need to know the section ... | |
| how to interpret reinforcement | 11/2/2011 |
| Q: how do i interpret the number of reinforcement after designing shear wall in etabs .... A: If you look at the output tables, it will tell you how much rebar is needed (mm2/m), which is ... | |
| Eccentric Footing Design | 11/2/2011 |
| Q: Sir, Please find attached calc's for design of Eccentric footing. please guide me wheather i am ... A: I am sorry but the text is not readable, but I note that your pressure sketch under the footing pad ... | |
| how to calculate vertical load on a wall | 10/31/2011 |
| Q: how do i calculate vertical load on a wall A: Just work out the tributary areas of all slabs spanning on to the wall and multiply by (self wt. + ... | |
| ductility & stiffness | 10/29/2011 |
| Q: Good Day! I would like to clarify 1.what is the relation between ductility and stiffness of a ... A: 1. Stiffness determines how much a structure will deflect for a given load. Ductility determines how ... | |
| thermal pour strips | 10/27/2011 |
| Q: good to have u back....hope u had a good and safe vacation..sir regarding the our strips u suggested ... A: The pour strips should be no wider than 1 to 1.5m, so that the rebar lap splices happen within that ... | |
| conduits in concrete | 10/27/2011 |
| Q: There are 16 conduites of 15 cm to be passed verically in abutment wall (2 m wide).I read ACI 318 ... A: This depends on the location and orientation of the conduits in relation to principle axes for shear ... | |
| Joints in concrete structures | 10/16/2011 |
| Q: 1) Should vertical expansion in abutment wall to be continued in footing and what is the reaon. 2) ... A: Joints in concrete are required for two main reasons- to prevent early-age cracking of the concrete ... | |
| design of strip footing with columns not wall | 10/15/2011 |
| Q: how can i design this kind f footing and arranement of steel bars thank u much A: First of all, the question would be why have a strip footing for columns? The reason I ask is that ... | |
| Class 30 Cement content | 10/12/2011 |
| Q: I have been having this argument with my seniors regarding the cement content of a class 30 ... A: I am not sure what 32.5 ppc is, but you are using far too much cement for 1m3 of concrete! When I ... | |
| Class 30 Cement content | 10/11/2011 |
| Q: I have been having this argument with my seniors regarding the cement content of a class 30 ... A: This depends a lot on how well you do your aggregate grading and what water cement ratio you use, as ... | |
| RC DESIGN (hollow section) | 10/10/2011 |
| Q: Good day Sir. While answering a question about design of hollow circular member, u said that section ... A: If the section is symmetrical (such as a circular tube), then the neutral axis will be right through ... | |
| Tank base slab on ground | 10/7/2011 |
| Q: 1.how to design a base slab resting on ground for tank for rigid and flexible condition. 2.up to ... A: For rigid conditions (asumming stiff/rocky ground), the base slab is designed with nominal rebar, ... | |
| Moment redistribution | 10/7/2011 |
| Q: Gud morning Sir. I read your answer about the above subject. If gravity load that course high moment ... A: As I explained earlier, moment redistribution can only be done for continuous beams (not simply ... | |
| Water Cement Ratio | 10/4/2011 |
| Q: i want to know exact formula of water cement ratio how can calculate the exact water in mixer to mix A: This depends on a lot of variables, but this website gives you the procedure: ... | |
| strengthening of footings | 10/3/2011 |
| Q: Good Day! I have a warehouse need to be expanded.In this case I am adding one more frame in the ... A: You can excavate around the existing base, expose the rebar to sufficient depth (from the sides) to ... | |
| settlement of soil | 10/2/2011 |
| Q: what is settlement of soil? A: This ocurrs when the air voids within the soil particles get compressed so that the overall volume ... | |
| Thermal analysis | 10/2/2011 |
| Q: hope you will be fine...good to have you back after your vacation. actually im designing a 11 storey ... A: That is a very high gradient- surely the daily variation will not be more than 10 to 15 degrees? In ... | |
| Thermal analysis | 10/2/2011 |
| Q: hope you will be fine...good to have you back after your vacation. actually im designing a 11 storey ... A: Just work out the maximum daily variation of the temperature of the slabs (worst scenario will be ... | |
| Force on a hinge | 9/30/2011 |
| Q: I'm sorry if this question is not appropriate for your expertise, but I'm not sure who else to try, ... A: You have not indicated the height of the gate, or more importantly the vertical distance between ... | |
| project on seismic vulnerability of buildings | 9/29/2011 |
| Q: What is the scope of doing a btech final year level project on the topic seimic vulnerability ... A: Your topic can be quite technical, if you go deeper into assessing the aseismic design and ... | |
| classes of concrete | 9/29/2011 |
| Q: I would like to ask about classes of concrete... is concrete class c25 the same as c20/25 or no? it ... A: Yes, with the new system of classifying concrete, both the 28-day cylinder strength (20) and the ... | |
| LEGAL STATUS OF SAUDI BUILDING CODE | 9/28/2011 |
| Q: What is the legal status of saudi building code. Is it necessary to use it or its just as optional ... A: I have not worked in KSA, but I would assume that if you do not comply with it you will not get ... | |
| Steel quantity extract from Etabs | 9/27/2011 |
| Q: i had a query in Etabs.i had done one model in etabs,i want to extract the quantity of steel and ... A: As far as I know, ETABS does not output rebar quantities/tonnage after design (as STAAD.Pro does). ... | |
| shortening of concrete columns | 9/26/2011 |
| Q: i am searching for a good reference or software to calculate the shortening of columns according to ... A: Yes, the RCC in UK sells one at their website: ... | |
| F22 and Pier Axial Force in ETABS | 9/23/2011 |
| Q: A: F22 is axial force per unit length (so if a pier is 2m long, say the F22 is 500 kN), then for the ... | |
| Lateral Earth Pressure combination | 9/22/2011 |
| Q: Khan: I’m a structural engineer and it is not clear for me what is meant by the quoted part of ACI ... A: The way I interpret that is that when you use H in the the combos (e.g. with W and E), when earth ... | |
| No. of Blocks | 9/22/2011 |
| Q: Sir, I want to ask that How can we calculate the number of blocks for a block masonary work as size ... A: Assuming that the wall is 8 (inches?) wide, then basically you work out the elevation area of the ... | |
| shortening of concrete columns | 9/21/2011 |
| Q: i am searching for a good reference or software to calculate the shortening of columns according to ... A: One of the best reference for this, with step-by-step guidance is the book by Mark Fintel, SK Ghosh ... | |
| Safe working load for steel wire | 9/19/2011 |
| Q: I need to find out how much weight a piece of wire will support. The wire has a diameter of 0.18mm. ... A: The length of wire makes no difference to tensile capacity but does effect the overall elongation ... | |
| final year project | 9/19/2011 |
| Q: sir, i am a final year student in civil engineering and i want to do my FYP this semester on a topic ... A: I would suggest that you do a project on comparing which lateral stability systems are most suited ... | |
| column drop panel | 9/19/2011 |
| Q: sir, for designing stepped square footing for column drop panel i require axial load on to the ... A: You need to work out the dead and live loads reaching the edges of the drop panel, (on all 4 sides), ... | |
| Moment Redistribution | 9/17/2011 |
| Q: Sir, At last floor column have more monents. can you please explain me about Moment Redistribution? ... A: Moment re-distribution occurs when you have high support (hogging) moments in beams and low span ... | |
| doubt about pile caps | 9/15/2011 |
| Q: sir these are the pictures in our site pile caps are shown in it A: What you have shown in the picture are not piles and pile caps, but columns and column heads, or ... | |
| Joints in beam foundation | 9/5/2011 |
| Q: Khan I checking a design of a long foundation concrete beam ( 500 m.). This beam is going to ... A: Did you mean 50m, or 500m? If it is 50m, you do not need any joints. If it is 500m, and if the beams ... | |
| tie beam | 9/5/2011 |
| Q: I have a wall lengthening more than 25 meters in one direction, therefore i wanted to introduce at ... A: I am not sure if I fully understand your question, but if you have 25m of wall, with one ... | |
| design of pile cap with single pile | 9/3/2011 |
| Q: Sir, I want design a pile cap with single pile located center of pile of cap.The pile cap carrying ... A: In this case, just ensure that the column is central to the pile, but take accidental eccentricity ... | |
| ribbed slab | 9/2/2011 |
| Q: modern way of constructing ribbed slab with figures A: You have not really asked a question, but if you want details about this form of construction, ... | |
| Footing design | 9/1/2011 |
| Q: I am a fresher in the industry. I would like to know the design of a tie beam. I have an inverted ... A: Yes, you can use the inverted T-beam as a tie beam and design it for double curvature bending/shear ... | |
| Inverted beam design | 9/1/2011 |
| Q: I want to know hoe to provide the additional hanger stirrups for the inverted beams or for beams ... A: Simply work out the shear due to the slab at edge of beam and support that with additional steel ... | |
| Hello ! | 8/31/2011 |
| Q: How heights of rooms and halls are fixed with respect to their sizes ? A: They can be any height, depending on functional and architectural requirements. The minimum clear ... | |
| structure neighbouring building | 8/23/2011 |
| Q: This is general question, suppose it is required to construct G+20 building with out any basements ... A: This depends on the type of subsoil material- if it is rock or soft rock, you may not need to take ... | |
| final year project topics | 8/20/2011 |
| Q: I am a final year student of Civil engineering from India. I'm interested in doing my project in ... A: I do not know much about green concrete, maybe it means concrte with fly ash or pozzolana, as that ... | |
| Sway of Monuments | 8/17/2011 |
| Q: You said about the sway of mosque minaret that i can relax the criteria..but how much..im getting ... A: That should be fine (235mm over 60m)- you could even accept a higher sway so long as your finishes, ... | |
| Industrial Shed Expansion | 8/7/2011 |
| Q: Good Day! I have to expand an existing Industrial shed by addition of one more frame(same span that ... A: You may consider the internal column without direct wind loading, but of course the overall wind ... | |
| hollow pot floor | 8/6/2011 |
| Q: i am an engineer trying to do a hollow pot slab, can you please furnish me with the procedure or ... A: Please see my answer below: ... | |
| Gantry girder | 8/6/2011 |
| Q: we are going to construct a factory building of 17.7m span & 6m bay length having two 25 ton crane ... A: 1. For use as a gantry beam, the only way you can keep the deflection within limits is to provide ... | |
| career exploring | 7/28/2011 |
| Q: I am currently a high school student. I would like to get into medical school, but I've heard that ... A: Civil engineering is an excellent career, but you will need to have an interest in the topics and ... | |
| -ve reinforcement in cont. beams. | 7/28/2011 |
| Q: Sir, As you know, -ve moments are generally much more than the +ve moments in a continuos beam in a ... A: What happens is that the top steel yields a bit, so beam rotates very slightly, with cracks in the ... | |
| core test result | 7/28/2011 |
| Q: Good Day! While done a core test for the roof on a 9 yrs old existing building(ground only),the ... A: Firstly you should always take 3 core samples from each location to cater for coring/testing ... | |
| -ve reinforcement in cont. beams. | 7/27/2011 |
| Q: Sir, As you know, -ve moments are generally much more than the +ve moments in a continuos beam in a ... A: As you may be aware, you are allowed to redistribute between 15-25% of support moments to the span, ... | |
| Lap lengths | 7/22/2011 |
| Q: What will be difference in lap length for columns and beams,whether it will be same or not. A: The lap lengths depend on several factors, such as diameter, location (e.g. corner or face), whether ... | |
| Honeycombing | 7/19/2011 |
| Q: Sir, We have honeycombing in a beam oc 18"x12" supporting a sloped roof (33degree). The depth of ... A: If the hoenycombing is near the bottom of the beam and in the middle 1/3rd of the span, then you can ... | |
| beams and columns | 7/18/2011 |
| Q: can you help me solve this problem for my rsearch. thanks *definition of ties and stirrups ... A: Ties are mainly for columns and stirrups are mainly for beams. For both columns and beams they ... | |
| Soil Mechanics, Dry Density. | 7/17/2011 |
| Q: During my geotechnology class this morning, there was a question posed that my tutor could not ... A: I am not an expert in this field, but engineering judgement tells me that if you want a net dry ... | |
| Cement floor tiles | 6/29/2011 |
| Q: I have made cement floor tiles with steel slag by replacing various percentage of OPC. After water ... A: I would say that for use as floor tiles and blocks, your CCS tests would be sufficient- perhaps you ... | |
| Final Year thesis topics | 6/27/2011 |
| Q: .i am a 4th-year civil engineering student,,and i am preparing for my thesis, i just want to ask for ... A: If you had browsed my previous answers you would have found the following : Some topics I have ... | |
| single beam to two slabs at different levels | 6/25/2011 |
| Q: Iam modelling a villa in Etabs.I hav two Slab panels of size 6mx3m.thickness 150mm,side by side but ... A: If I was doing this modelling, I would just put the slabs at the same level, say at 2.9m level, as ... | |
| 8 dia not available, can fix 10dia , how | 6/25/2011 |
| Q: Sir At my site at first floor one of slab area is 3200mm x 3600mm Dwg shows to fix the Dia8@150 c/c ... A: If you work out the cross-sectional area of the bars and multiply by the spacing, you get a similar ... | |
| concrete footing | 6/22/2011 |
| Q: The existing house has 15 load-bearing steel piers. To build around each pier with 100mm x 200mm red ... A: This really depends on how thick the floor slab is, what rebar there is in it and also how strong ... | |
| rcc beam lapping | 6/20/2011 |
| Q: sir, i want to know about the lapping design of a beam. length of beam 20m and resting this beams ... A: You basically have to do the analysis with all load combinations and design the rebar to curtail as ... | |
| 8 dia not available, can fix 10dia , how | 6/20/2011 |
| Q: Sir At my site at first floor one of slab area is 3200mm x 3600mm Dwg shows to fix the Dia8@150 c/c ... A: Y8 at 150 c/c equals 335 mm2 per m width of slab. The equivalent Y10 would be at about 225 c/c, ... | |
| etabs section cut | 6/19/2011 |
| Q: Sir, please tell me how to determine design moment using section cut in etabs model of a box shaped ... A: You can request the analysis outputs at any pre-deterined section cuts so that this appears in the ... | |
| about QA and QC | 6/11/2011 |
| Q: whats the important difference between QA and QC? A: I am by no means an expert in this field, but logically I would say QA is to set up advance ... | |
| Brick Wall Modeling | 6/10/2011 |
| Q: Can you suggest me how do we model a brick wall masonry in ETabs as a strut model? Thank You ... A: This is a bit difficult to model as brickwork properties at a diagonal are not well defined (depend ... | |
| RAFT SLAB ON DOWNSTAND BEAMS ON THE GROUND SURFACE | 6/9/2011 |
| Q: I have a raft slab that is to be supported by ground beams 1.2m deep. The beams bear directly on the ... A: Firstly what you describe is not a raft slab, but a ground slab suspended between ground or grade ... | |
| rebar corrosion | 6/8/2011 |
| Q: Sir my question is that when a steel is placed in open atmosphere, it gets corrosion,when it reacts ... A: Yes, the rebar is protected from rusting due to the alkaline present in the concrete. You are right ... | |
| Punching Shear | 6/8/2011 |
| Q: I will be grateful if you answer me my question? Does the addition of Piles to raft reduces effect ... A: With the dimensions you have indicated, if the column is right in the centre of 4 piles, then you ... | |
| Punching Shear | 6/8/2011 |
| Q: I will be grateful if you answer me my question? Does the addition of Piles to raft reduces effect ... A: I am not sure if I have understood your question correctly, but whether you have piles or not, it ... | |
| Cross beams + Raft & lift pits | 6/8/2011 |
| Q: I have to avoid middle columns in a hall, therefore 3 beams (c/c-8.1 m)each 16.2 m long running ... A: 1. Where raft is lower than lift pit depth, then extend the liftshaft walls down to raft and either ... | |
| Cross beams. | 6/7/2011 |
| Q: I have to avoid middle columns in a hall, therefore 3 beams (c/c-8.1 m)each 16.2 m long running ... A: You have two options here: 1. Keep the slabs as 2-way spanning and use the 32.4m beam as secondary, ... | |
| Model a concrete wall | 6/6/2011 |
| Q: 1.What is the best suitable option to model a concrete wall extending from column to column for ... A: 1. Model it as a shell element, but in any case that will also behave like a shear wall. The base ... | |
| Grade Slab | 6/5/2011 |
| Q: Can you please explaing me the difference between Grade slab and Ground slab. A: If they are both supported by the ground/soil, then they refer to the same thing. Sometimes a ground ... | |
| PREFAB STRUCTURES | 6/5/2011 |
| Q: Please give me details Column beam junction, iam afride of the reduction in the size of the column, ... A: This should not be a problem so long as the joint is properly detailed. Please refer to these ... | |
| Point Restraint while modelling Raft | 6/5/2011 |
| Q: 1. While i try to expert the Raft Foundation to Etabs, what is the restraints that i should provide ... A: If you have modelled a raft in ETABS, then the columns support restraint should remain as ... | |
| Vibration problem | 6/2/2011 |
| Q: we have to construct a 6-storied residential building in a industrial zone where vibration due to ... A: The main structural safety/performance issue with this situation will be foundation material and ... | |
| structural analysis II | 5/31/2011 |
| Q: Determine the moment of resistance of an aluminium beam having a cross-section as shown. The ... A: This sounds like a homework question, which I do not normally answer. However, you can work it out ... | |
| Cracking tests on high rise shear walls | 5/30/2011 |
| Q: I would like to ask that what are the industry tests peformed on high rise core shear walls of a ... A: You did not tell me that the walls were 2.5m thick! This sounds very much like a heat-of-hydration ... | |
| Cracking tests on high rise shear walls | 5/30/2011 |
| Q: I would like to ask that what are the industry tests peformed on high rise core shear walls of a ... A: I would suggest that you first check the design and construction details, and if both these are OK ... | |
| RCC Detailing- Long Span Beam | 5/30/2011 |
| Q: We had designed a Mosque, Requiring column free hall, resulting in main girder beams spanning 22.5 ... A: For your bottom bars, option 2 is better. For top bars, again it is better to stagger the laps. ... | |
| Problems in erection of virendeel truss | 5/30/2011 |
| Q: Arshad Khan, We have designed a virendeel truss spanning 40 m and is being erected. While erection ... A: You have not confirmed whether the base plates are rotating, but this sounds like your bolts are ... | |
| Conversion of CBR to KN/M2 | 5/29/2011 |
| Q: Sir, I was surfing the internet for some information on CBR conversion and came across this site. ... A: I am not an expert in this subject but from what I know, CBR is used mainly for pavement/roads ... | |
| Problems in erection of virendeel truss | 5/29/2011 |
| Q: Arshad Khan, We have designed a virendeel truss spanning 40 m and is being erected. While erection ... A: Maybe I am understanding the exact issue, but surely if you remove the 1/3 point erection supports, ... | |
| pile cap and bored pile design | 5/25/2011 |
| Q: Mr. Khan.. I am a fresh graduate in Civil Engineering , Indonesia. I need your guidance to design ... A: You can download the pile & cap design spreadsheets from this website: ... | |
| Partition Load on slab | 5/25/2011 |
| Q: Can the partition wall loads be applied on the slab as area loads or it can only be applied as line ... A: If the partitions are lightweight (timber/fibreboard) demountable type, then you can assume a UDL of ... | |
| Query in Civil Engg. | 5/23/2011 |
| Q: Sir, I am Mohd Talha Khan from India and I have done B.Tech in civil engineering. I need a guidance ... A: If you do not like civil enginering then I would not recommend Building Engineering for you as this ... | |
| Fiber concrete | 5/20/2011 |
| Q: Please explaing me what is difference with reinforcement concrete and fiber concrete, and what is ... A: FRC works by preventing micro-cracks within concrete and significantly increases the tensile ... | |
| Foundation on fill | 5/19/2011 |
| Q: We want to build some two to three storied residential building on newly filled area. Filling depth ... A: This depends on how well the fill was compacted and whether the compaction was done in layers of ... | |
| column & Pillar | 5/14/2011 |
| Q: what is the different between column & Pillar A: In many cases these terms are interchangeable, but a column is usually subjected to mainly axial ... | |
| Wind load in Tanzania | 5/13/2011 |
| Q: Arshad Khan, I am searching for basic wind loads for buildings in Tanzania. Does a standard for the ... A: I am trying to find out for you from my contact in Tanzania, but for the moment I would hazard a ... | |
| Dynamic loads | 5/12/2011 |
| Q: How do you test dynamic loads on a structure? I see that your expertise is in sesmic design, so I ... A: If you are talking about designing buildings, then the most common methods are to use Response ... | |
| core wall design | 5/10/2011 |
| Q: i want to know the steps to design a core wall of a stair case,from where can i get those steps, ... A: In simple terms, work out the total vertical loading (W)on the total liftshaft (from ... | |
| structural mechanics | 5/10/2011 |
| Q: what is the relevance of structural mechanics to architecture A: If you mean structural analysis and design, then the relevance is that without this discipline or ... | |
| STRIP FOUNDATION Rebar | 5/10/2011 |
| Q: In a strip foundation which is distribution steel and which is main steel and which steel should be ... A: That will have no adverse effect, so long as the main rebar is sufficient to resist bending and ... | |
| STRIP FOUNDATION Rebar | 5/10/2011 |
| Q: In a strip foundation which is distribution steel and which is main steel and which steel should be ... A: This depends on the geometry and the loading, but in most cases the main rebar (stronger) is the one ... | |
| cantilever slab design in etabs | 5/9/2011 |
| Q: Good Day!!! How can I model a cantilever slab in etabs.I have a flat slab with peripheral beams and ... A: Just model it like any slab, but do not have any supporting columns at the outside edges. Maybe you ... | |
| ribbed slab in ETABS | 5/8/2011 |
| Q: I am working on my final year project. but i have a problem in modelling a one way ribbed slab in ... A: The best way to model this is to define it as a membrane, with special one-way spanning, and then ... | |
| Spacer bar | 5/8/2011 |
| Q: Need to know spacer bar shall be placed at what distance? please make a mention of code specifying ... A: There is no specific code specification for the spacing of spacers (bar or block. This really ... | |
| Project topics | 5/6/2011 |
| Q: I'm final year student in civil engineering ( Bachelor of engineering ). I'm interested in doing my ... A: If you had browsed my previous answers you would have found the following : Some topics I have ... | |
| reconstruction for a load bearing building | 5/3/2011 |
| Q: Dir sir. I'm a just graduated civil engineer. I want to rebuild my family's home in KHARTOUM-SUDAN ... A: 1. You expose it and inspect the concrete for any deterioration and expose the rebar to see if it is ... | |
| ETABS trim and extrude | 5/2/2011 |
| Q: Is there any trim/extend command in E-TABS? A: Yes, you can trim by dividing lines or areas at intersections with lines or points and then deleting ... | |
| rigid &semi rigid diaphragm | 4/30/2011 |
| Q: sir i wanna ask you about the rigid and semi rigid diaphragm, when we use each of them and the ... A: Fot most building structures you should use semi-rigid daiphragms, as they best simulate actual ... | |
| reconstruction for a load bearing building | 4/28/2011 |
| Q: Dir sir. I'm a just graduated civil engineer. I want to rebuild my family's home in KHARTOUM-SUDAN ... A: If the existing grade beam is still in good condition, and it is resting on firm rock at 80 cms ... | |
| Euro code | 4/26/2011 |
| Q: 1)What is favourable & Unfavourable actions ? (Table A1.2 (A) Page no 54 of BS EN 1990:2002 2)How ... A: 1. In this case, unfavourable for overturning would be without dead weight of equipment, and vice ... | |
| Euro code | 4/26/2011 |
| Q: 1)What is favourable & Unfavourable actions ? (Table A1.2 (A) Page no 54 of BS EN 1990:2002 2)How ... A: 1. Favourable action is when the overall stress on a member is reduced, and vice versa. 2. The load ... | |
| pad foundations | 4/23/2011 |
| Q: How thick should a pad foundation be if the load is 750kn and the allowable bearing pressure of the ... A: This depends on whether there is also bending moment or not, and also on the grade of concrete and ... | |
| civil engg | 4/20/2011 |
| Q: sir i have completed m tech in water resource engg and want to start my own consultancy .how ... A: Sorry, I do not know what the regulations are in India- I suggest you consult the local Engineers ... | |
| Practical problems. | 4/20/2011 |
| Q: I have some practical problems: 1) When concrete work is being held, sometime concrete lorry gets ... A: 1. This depends a lot on the mix, the water/cement ratio and the prevailing temperature. As a rule, ... | |
| Modelling of Ramps in ETABS | 4/19/2011 |
| Q: Sir When I am modelling a ramp as an area object in ETABS with either shell or membrane element, ... A: Unless you take care, all loading from slab/ramp elements to supporting beams will only be ... | |
| f'c and fcu | 4/17/2011 |
| Q: i need to know what is the difference between f'c and fcu of the concrete A: If you had first browsed my past answers you would have found the following: Generally a cylinder ... | |
| model export from ETABS | 4/16/2011 |
| Q: aoa i hope you will be fine...thank you for the guidance you've been giving me till now....please ... A: This really depends on the relative size and location of the liftcore to the rest of the building ... | |
| RC water tank | 4/14/2011 |
| Q: P/s advice on the best remedy for the leak occuring in a slab of a 6000 gal rc elevated water tank ... A: The best solution for this is to empty the tank (if you can), and after the concrete surface around ... | |
| CORE CUTTING IN RCC BEAM | 4/14/2011 |
| Q: Good Morning Mr. Arshad Khan: We were discussing this yesterday and I was releived with your prompt ... A: You should try and avoid cutting through sturrups, unless the hole is within the middle third span ... | |
| CORE CUTTING IN RCC BEAM | 4/13/2011 |
| Q: MY question is whether it is safe to core cut into a RCC Beam to provide for piping of Spilt Air ... A: This depends on the depth of the beam- if the beam is only 10cms deep, then cutting a 3 cm hole may ... | |
| steel construction | 4/12/2011 |
| Q: can u explain me steel onstruction and pre cast construction technology A: This is a wide ranging question and you really need to read some books or browse on Google to get ... | |
| interview | 4/11/2011 |
| Q: What is it like being a top civil engineer? What do you do on a typical day? How many years were ... A: I have answered these types of questions before, so if you do not mind, I will cut/paste the Q&A for ... | |
| model export from ETABS | 4/11/2011 |
| Q: aoa i hope you will be fine...thank you for the guidance you've been giving me till now....please ... A: 1. First do an analysis without modifiers and then adjust just as you have noted. 2. Yes, you can ... | |
| computer terms in civil engineering | 4/8/2011 |
| Q: plz i want to know role of computer applications in apmroving productivity of construction project ... A: Basically computers are tools to speed up the processes you list above (before computers were around ... | |
| diaphragm wall | 4/5/2011 |
| Q: I read in the document that 20% of allowable bond stress is to be deducted. So could you show me the ... A: Yes, so that is exactly what I said before- the rebar strength is not affected, but the bond ... | |
| point load on raft footing | 4/4/2011 |
| Q: I am designing a raft footing for a three storey building. The soil is very weak (loose ... A: You should only consider the raft as "rigid", if the thickness is more than about 0.2 to 0.25 times ... | |
| Regarding Thesis | 4/1/2011 |
| Q: Salaam walekum sir , I need your help regarding my project - COMPARTIVE COST STUDY OF RAFT ... A: This is quite a specific topic, so maybe you will not find anything on Google. However, you will ... | |
| prerequisite for a newbie structural engineer | 4/1/2011 |
| Q: sir, when a new civil engineering graduate joins structural design office , what basic knowledge do ... A: Yes, he should be able to design the simple elements you list, but he should do these by manual/hand ... | |
| Restaurant Construction | 3/31/2011 |
| Q: What type of foundation will be more suitable for a raised restaurant which is o be built on a ... A: So, what you meant is ask is whether the marshland would have an effect on the columns? Surely thsi ... | |
| Restaurant Construction | 3/31/2011 |
| Q: What type of foundation will be more suitable for a raised restaurant which is o be built on a ... A: This depends on the depth of sound/good ground- if there is good bearing surface at say 1-2 m below ... | |
| Stifness modifier | 3/30/2011 |
| Q: I am bit confuse in using stiffness modifier when to use and what value to use, i am designing by ... A: For drift limits, you are right about the factors quoted, although even here if the walls are shown ... | |
| Seismic LOad | 3/30/2011 |
| Q: I am Designing a model for a hotel located in dubai, and i know that ETABS has the defults regarding ... A: Using the default UBC (not IBC)loading with zone 2A is fine for Dubai- it is not over conservative. ... | |
| Building load calculation | 3/19/2011 |
| Q: i want to know how can i calculate the RCC Building load? A: Fot calculating overall building loads, you need to assess the self (dead) weight of the structure ... | |
| structural design | 3/18/2011 |
| Q: You recently posted a question to Seshadri Srinivasaiah in category Civil Engineering: Dear Sir, ... A: It is difficult to advise properly without more details, but I suspect that these are temperature ... | |
| Squash Court Wall | 2/18/2011 |
| Q: I have more of a practical question to ask you. In fact, I am supervising a Gymnasium Project where ... A: I am not an expert in this particular field, but my judgement is that the loading from a squash ball ... | |
| Column Model in Etabs | 2/17/2011 |
| Q: I think, a question i made yesterday is not clearly understood. My question was regarding modelling ... A: In this case you are telling me that the column is 2 ft or more wide? The two ways you can model ... | |
| Foundation type | 2/16/2011 |
| Q: What is the best type of foundation for a foundation a bungalow built close to the sea? Will a raft ... A: In that case a raft foundation is best as it minimises overall applied pressures and also reduces ... | |
| Etabs modeling of soil pressure | 2/16/2011 |
| Q: I would be grateful if you answer me my querries. 1. I need to model a single column to rest two ... A: In ETABS, all beams at different levels need to be on their own "Story", so just create an ... | |
| Portal frames | 2/15/2011 |
| Q: me and my group are assigned to do a project on portal frames, but we are not much familiar with the ... A: You have not mentioned whether this is in RCC or steel. Both will have similar analysis methods, but ... | |
| Design of RC Circular Hollow Mast | 2/14/2011 |
| Q: In one of our projects, I have to design a 35m tall RC circualr hollow Mast. Could you please guide ... A: Good to hear from you! You can model this in STAAD or SAP2000 (or similar), or do what we used to ... | |
| Foundation type | 2/12/2011 |
| Q: What is the best type of foundation for a foundation a bungalow built close to the sea? Will a raft ... A: That all depends on what the ground conditions are like. If there is competent rock near the surface ... | |
| ETABS pin - support | 2/11/2011 |
| Q: in Etabs model when found level is pinned and we apply sesmic lod,so why Etabs give us momnet value ... A: This is probably becuase you have some shear walls? In that case, the coupled forces at the corners ... | |
| Design of a circular slab | 2/10/2011 |
| Q: Are there any empirical formulae that can be used in the design of RC circular slabs (suspended) Is ... A: Yes, circular slabs analysis and design is different from rectangular slabs, as the deflection and ... | |
| expansion joint | 2/10/2011 |
| Q: Is it necessary that the width of expansion joint should increase with the height of the building? ... A: The width does need to increase with height, but only if it is a seismic zone. Basically you need to ... | |
| ETABS vertical load on shear wall | 2/9/2011 |
| Q: In etabs could is possible to define a vertical load on shear wall and should we model a under ... A: 1. Yes, if you want to apply a point load. make sure it is at a node (i.e. mesh the wall so, that ... | |
| design examples | 2/5/2011 |
| Q: sir, can you suggest ebooks,books, and other web sources that illustrate various types of RCC roof ... A: There are a lot of web sources, which you will find by putting appropriate keywords in ... | |
| sloping roof without support at centre | 2/4/2011 |
| Q: IS it possible to design a sloping roof (as shown in fig)? if yes please help in placing of beams. ... A: Yes, it is possible, but there will be significant horizontal thrusts at the eaves level (where ... | |
| Load bearing strength of steel tube filled with compressed water | 2/3/2011 |
| Q: Designing a mast made from steel tubing. Is there any data or published literature on what effect on ... A: That's an interesting concept, which I have not come across before. Looking at it from first ... | |
| Foundation /Geotechnics | 2/3/2011 |
| Q: Weldone for the good work u're doing. (Pls I'll ask 2 qtns here: Q1: I want to get full documented ... A: 1. I am not an expert on vibroflotation or vibrocompaction, but the following website will guide ... | |
| Geotechnics | 1/31/2011 |
| Q: I am working on a compacted clay dam which is to be built on an impermeable stratum. A drainage ... A: This is not really my area of expertise, but I would imagine that an RC wall cut-off barrier, ... | |
| Science Fair | 1/30/2011 |
| Q: It needs to hold at least 11 lbs, and it needs to be 1ft. off the ground. In your opinion what ... A: If you browse my past answers you will find I have a detailed Q&A session for an interview. To ... | |
| using load cases in footing design ... | 1/29/2011 |
| Q: .. is it approriate to apply load cases (e.g. the IBC 2006 ASD Basic counteractive case ... A: I am not too familiar with IBC, but on first principles you should design the RC structure for the ... | |
| Deflection Rate | 1/28/2011 |
| Q: What is the usual deflection rate you are considering in an expansion joint if the building ... A: I am not quite sure what you mean by deflection rate, but the joint gap should be enough to cater ... | |
| Cantiliver Design | 1/27/2011 |
| Q: Salaam, I have one serious problem in my project of the new construction of an old market after ... A: Your designers are right to be concerned, because for that sort of construction, you will probably ... | |
| Eccentric footing Design | 1/22/2011 |
| Q: How to design an eccentric footing? A: I have answered this before, if you had browsed my previous Q&A: **********************Can i have ... | |
| Thesis Topic about materials | 1/21/2011 |
| Q: Can i ask for a Civil engineering thesis topic on materials of construction? thanks! A: Some topics I have listed previously are: 1. High strength concrete 2. Durability of concrete. 3. ... | |
| Tanks design | 1/20/2011 |
| Q: I m designing a water tank for water treatment facility. The tanks is of 60m x 103m x 7m, and it is ... A: If you had checked my past answers, you would have found the following: *******************Dear Mr ... | |
| structural design for duplex house | 1/14/2011 |
| Q: sir, i read your answers for some questions related to house construction, i got most of the answers ... A: I am happy to hear that you read my past answers before asking more. The information you have ... | |
| Blinding concrete | 1/12/2011 |
| Q: Do we need to provide joints in blinding concrete as per any international codes? What are the ... A: Normal practice is to not have any joints in blinding concrete, especially if it is cast in ... | |
| irrigation system | 1/11/2011 |
| Q: what is the difference between a circular culvert and box culvert? and what are the advantages and ... A: They are designed differently, as circular one mainly work by radial compression whilst ractangular ... | |
| mat foundation | 1/11/2011 |
| Q: sir, How to consider the soil -raft/mat interaction as the soil is not a linear material?what about ... A: You can model the matt/raft sitting on springs (stiffness determined from ground investigations) at ... | |
| r.c.c. design & tho. | 1/10/2011 |
| Q: sir, R.c.c.design key l kon si book best hey A: Please note that this forum is in English. Try these 3 books: 1. RC Design to BS 8110 Simply ... | |
| Dynamic Analysis | 1/10/2011 |
| Q: Sir where we use dynamic Analysis and what is purpose and advantage of dynamic analysis. means in ... A: You only need to use dynamic analysis for buildings that are dynamically sensitive- such as ones ... | |
| Civil engineering | 1/8/2011 |
| Q: please i need a list of project topics on civil engineering.And i need a full project on one of the ... A: I (and fellow experts) have answered this question many times before- please browse my past answers ... | |
| Column and Beam Modifier | 1/8/2011 |
| Q: Sir, My question is that in Acia code 318-02-8.5.1(b) modifier is there for column,beams & slab. ... A: You are correct- for strength, or ultimate limit state, you should use the results from the ... | |
| Boundary element length in Etabs | 1/7/2011 |
| Q: When we design shear walls for boundary elements, the criteria we follow as per ACI 318 Chapter 21 ... A: In this case ensure that you have sufficient rebar to cater for all vertical stress throughout the ... | |
| Temperature forces in Staad | 1/5/2011 |
| Q: I am designing a control building in UAE. I want to how to apply temperature forces in STAAD.What is ... A: Basically you need to decide on the temperature range between night and day (and also between winter ... | |
| Buildings | 1/4/2011 |
| Q: 1. Remind me the different mixes for different concrete classes and their strength. 2. If given the ... A: 1. This website will help you with full details of concrete mix design: ... | |
| commercial building ring beam | 12/19/2010 |
| Q: how to design ring beam for a star shaped building(G+4) A: The principles are the same as for a rectangular building, but you will need to be careful with the ... | |
| Plate Element Loading on Staad Pro | 12/18/2010 |
| Q: Can i ask for a reasonable answer and a supporting document that pertains to the aforementioned ... A: Actually both types of loading are OK for the plates, so long as the distrubution of the loading ... | |
| Diaphragm calculation | 12/16/2010 |
| Q: How we can calculate Slab to work as a diaphragm under seismic loads? best regards A: If you analyse the building by way of a 3-D model, then the diapgragm forces will be part of the ... | |
| Normal Office Floor Slab Strength | 12/15/2010 |
| Q: Is there a normal load bearing figure in kn/m2 for the floor slabs of modern office blocks ... A: Yes, the loading is all in accordance with British Standards. For offices, the normal live (imposed) ... | |
| Tower design | 12/15/2010 |
| Q: I am analyzing high rise R.C building using ETABS 1-IS it necessary to use sequence construction ... A: 1. You only need to use construction sequence analysis if the building is over 30 storeys and/or if ... | |
| ground beams | 12/14/2010 |
| Q: Arshad i want to ask about the design of ground beams that are poured on the top of columns neck so ... A: I am not sure I completely understand your question, but ground beams cast as you say can be ... | |
| Question about Geometry | 12/9/2010 |
| Q: How is application of Geometry used in Surveying? A: Geometry is vital for surveying because all the basic priciples are used, such as pythogras theorem, ... | |
| flat slab design | 12/8/2010 |
| Q: Good day! I have a slab of size 12.8m X 5.5m .my question ,shall I design a single flat slab ... A: If you need a flat slab you cannot have any downstand beams. If you can have downstand beams, then ... | |
| Interview: Civil Engineering | 12/6/2010 |
| Q: I am currently a freshman at Virginia Tech enrolled in general engineering. I am hoping to pursue a ... A: I have answered these types of questions before, so if you do not mind, I will cut/paste th Q&A for ... | |
| Continous Bracing of column | 12/5/2010 |
| Q: If a column is continously braced along one axis what will be effective length? Will we made its ... A: If it is continuously braced then the effective length is say the same as the dimension along the ... | |
| thesis | 11/24/2010 |
| Q: Khan I'm mark Aubrey can you give me some example thesis topic anything about Civil Engineer I'm 4th ... A: You have not stated what subject you are interested in, but if it's structures, you could try: 1. ... | |
| engineering interview project | 11/23/2010 |
| Q: ..please >Please describe your engineering field. >What is your job title? >Please describe your ... A: I have answered these types of questions before, so if you do not mind, I will cut/paste th Q&A for ... | |
| Presentation Skills | 11/20/2010 |
| Q: sir can you tell me any lively ideas for paper presentation A: I am not sure whether you are asking for some topics or the style of presentation. If you want ... | |
| Example of full design | 11/19/2010 |
| Q: Sir is it possible for you to upload any old example of rcc design of G+2 building (full calculation ... A: I am sorry but I cannot do that. However, there is an excellent booklet that does exactly that, and ... | |
| expansion gap for 93m rcc structure? | 11/19/2010 |
| Q: First let me brief about my building., A rectangular RCC building with length of 93m, Width as 28m ... A: As a general rule you should have expansion joints at bewteen 40-60 m centres. So, in your case you ... | |
| RCC | 11/16/2010 |
| Q: what is a rib slab and where it is used. A: Check out my earlier responses on ribbed slabs, which are one-way spanning: ... | |
| Foundation to depth to dig in sloped ground | 11/12/2010 |
| Q: existing ground condition is Sloping from 0.00m to -1.00m in span of 30-35m Now at 0.00m foundation ... A: If you have been told to set the foundations at 2.5m depth, then I would suggest that you set the ... | |
| Width of Design Strip | 11/12/2010 |
| Q: I am analysing a 3m thick raft foundation in SAFE. I need to specify the design strip in order to ... A: This really depends on the overall size of the raft and the spacings of the major gravity loads ... | |
| Base Shears in X & Y directions | 11/11/2010 |
| Q: is the base shear for a building should be the same in both direction X & Y for the building? " base ... A: If your building is symmetrical, with same stiffness in both directions, then yes the base shear ... | |
| strap footing | 11/10/2010 |
| Q: i bought piece of land back home in east Africa, the plot is in the middle of two dwellings already ... A: As it happens I have just returned home to Nairobi, operating as a freelance consultant! There are ... | |
| Post-Tension AASHTO Girder Design | 11/8/2010 |
| Q: I just wanted to know the details on how to design a superstructure of a bridge (pre-stressed ... A: I am sorry but I do not have any sample calcs, but you can find info on: ... | |
| shaft for a lift | 11/8/2010 |
| Q: A: For achieving optimal stiffness of a building, it is best to have the liftshaft in the middle of a ... | |
| Machinery Applied (Live) loading | 11/6/2010 |
| Q: slam sir, i m designing a technical college which have basemaent and 3 floors and have wokshops on ... A: You really need to know what sort of equipment will be placed on the floors before you design a ... | |
| am confused | 11/2/2010 |
| Q: Assalamo alaykom . i have moved all the slabs from the building and run it without slab so i have ... A: As I explained, please do not use both pdelta and line constraints. Then run the model and see if ... | |
| Composite steel plate RC wall | 11/2/2010 |
| Q: I am designing RC shear walls for a high rise building. Due to the shear force exceeding the RC ... A: I am not aware of any code that covers plate embedded in concrete, so you may need to use first ... | |
| i have problems in etabs about unstability | 10/31/2010 |
| Q: Am working on a tower of 32 floor with 5 basment , i do the auto mesh method and after the run i ... A: Without seeing the model it is difficult to advise. One possible problem may be due to autoline ... | |
| Core Pilecap design | 10/29/2010 |
| Q: Please advise how to check punching shear in core pile cap around the piles and along the walls. ... A: In that case you can check the punching shear for each pile like you would do for a pile-cap. The ... | |
| Beam & Slab spans of 22' & 24' needed | 10/29/2010 |
| Q: Great info / appreciate you taking the time here. I would like a rough idea of the column, beam & ... A: A few small fruit trees will only add around 0.5 to 1 kN/m2 loading, depending on spacing. You ... | |
| section modifier in reinforced conc. shear walls | 10/28/2010 |
| Q: I want to know your opinion about assign modifiers and its value on f11,f22,f12,... when we use ... A: This really depends on the relative stiffness of the beam and the wall or the beam and the column. ... | |
| Height of Building v/s Depth of Foundation | 10/28/2010 |
| Q: As a general rule what is the ratio of the height of building to the depth of the foundation ... A: There is no fixed rule for this because the type/depth of foundation depends on the ground ... | |
| Diaphragm | 10/27/2010 |
| Q: I am analysing an 80 storey RC building in ETABS, with 2 outrigger and belt walls on 1/3 and 2/3 of ... A: This could be due to a number of reasons, one of which is if your tower is not uniformly stiff ... | |
| Beam & Slab spans of 22' & 24' needed | 10/27/2010 |
| Q: Great info / appreciate you taking the time here. I would like a rough idea of the column, beam & ... A: As you point out, this medium is not for designing, but just advising. RC Beams should nromally be ... | |
| section modifier in reinforced conc. shear walls | 10/26/2010 |
| Q: I want to know your opinion about assign modifiers and its value on f11,f22,f12,... when we use ... A: This depends on the code you are designing to, but in the Middle East we have been using: For ... | |
| Bridge Abutment settlement | 10/26/2010 |
| Q: Sir, how would one go about repairing a bump at the end of the bridge as a result of differential ... A: This is a common problem and the best way to deal with it is to install some length of ... | |
| Expansion Joints in Tanks | 10/22/2010 |
| Q: What is the criteria of providing expansion joints in large water tanks. ANSWER: Hi Bilal, This ... A: As I explained before, you can design this with or without joints, depending on construction methods ... | |
| Soil test - crane access | 10/21/2010 |
| Q: Arshad, We have to park a 100 ton crane near to a concrete retaining wall & earth embankment. We ... A: In order to not impose additional loading to the retaining wall, you will need to place the crane at ... | |
| Expansion Joints in Tanks | 10/21/2010 |
| Q: What is the criteria of providing expansion joints in large water tanks. A: This depends on whether the tank is underground or above ground, and also on the shape- if ... | |
| RCC wall design | 10/21/2010 |
| Q: Please let me know the required side wall thickness and roof thickness in RCC structure to with ... A: This depends on the materials strength. At around 25 kN/m2 pressure, each wall of 15m length will ... | |
| modeling 2 towers with etabs | 10/19/2010 |
| Q: as per my previous question dated 15-10-2010 about twin towers on etabs.my movement joint is NOT ... A: I am not too familiar with IBC 2006, but using my engineering judgement, I would say that you should ... | |
| eccentric footing | 10/19/2010 |
| Q: what is eccentric footing A: An eccentric footing is one where the load (usually from a column) is applied near one edge rather ... | |
| Raft Foundation Design | 10/19/2010 |
| Q: Mr. Khan, How does the design a raft foundation that will support generators, equiptments, etc. ... A: The support conditions at the ends will be discontinuous (taking account of any basement walls), but ... | |
| FABRIC STRUCTURES | 10/19/2010 |
| Q: What are the standards for wind loads for the design of a fabric structure such as a car parking ... A: This depends on whether the fabric is pervious (net-like) or impervious- the wind load reduces for ... | |
| Cross braces | 10/18/2010 |
| Q: For a multi-story building with cross-bracing, do I need to check the compressed braces? A: If you are only relying on braces to act in tension, then no need to check, but you must define them ... | |
| Waffle Slab Design | 10/17/2010 |
| Q: AOA, Please guide me that how can i design a two way waffle slab A: This is designed in exactly the same way as a 2-way solid slab, but when you get the moments/shears ... | |
| modeling 2 towers with etabs | 10/16/2010 |
| Q: as per my previous question dated 15-10-2010 about twin towers on etabs.my movement joint is NOT ... A: I think you need to refer to the local applicable code for this. It is possible that the code ... | |
| etabs model for twin towers | 10/15/2010 |
| Q: i have a 3 basements+ground floor and above the ground floor 2 towers continue (one 15 floor and ... A: You have not given me the overall plan dimensions of the basement, but if there is no movement joint ... | |
| Raft Foundation Design | 10/15/2010 |
| Q: Mr. Khan, How does the design a raft foundation that will support generators, equiptments, etc. ... A: The design of a raft foundation for generators, equipment, etc is similar to designing a raft for a ... | |
| rectangular combined footing reinforcement | 10/14/2010 |
| Q: Good day... while designing a combined rectangular footing I have 12mm bars in long span and 16mm ... A: Yes, that is acceptable, so long as you have designed the 12mm and the 16mm bars with the correct ... | |
| civil engineering | 10/12/2010 |
| Q: salam. sir how can we calculate stair load in etabs also lift load.??? why is it that the bending ... A: The best way to model stair loading in ETABS is to manually calculate the reactions at the landings ... | |
| Vessels foundation | 10/11/2010 |
| Q: how to design foundation. Load applied on the foundation by 10 vessels each weighing 3600kg, placed ... A: Your answer is a bit contradictory- if the c/c distance is 2.8m and the vessels are 2 m diameter, ... | |
| structure | 10/11/2010 |
| Q: Asalom o alikum Sir, what is the criteria to know the strength of existing ... A: This is difficult to do- you can either carry out some ground investigations to ascertain the ... | |
| combined footing | 10/10/2010 |
| Q: Sir, We come across with a problem of overlapping of 2 r 3 coumnfootings with footing of retaining ... A: This should be simple enough- just add or subtract the individual pressures from the footings and ... | |
| ETABS modelling - Differential settlement | 10/10/2010 |
| Q: Salam, When you have tall tower, it is obvious that the columns will be subjected to the ... A: ETABS will only take account of instantaneous elastic shortening, so for any buildings above about ... | |
| RC slab design | 10/10/2010 |
| Q: AssalamoAlaikum! Please send me step by step design of one way and two way slab. A: This is a bit complicated to explain over this medium, but there are sources on the web, such as: ... | |
| Rebars Beam to Wall connection | 10/9/2010 |
| Q: slam sir,if we have a junction on concrete wall where a column and a beam are to be joint so in ... A: This depends on whether the joint is to be moment resistant or just simply supported. If simply ... | |
| Clerk of works | 10/9/2010 |
| Q: Hope you had good holidays and rest. I wanted to know the term "clerk of work". What does it stand ... A: A clerk of works is normally someone of lower qualifications than an engineer or architect and would ... | |
| civil engineering | 10/8/2010 |
| Q: what is the role of civil engineering graduate in HPCL(hindustan petroleum corporation limited) and ... A: I am not familiar with what HPCL does, but I can imagine that a civil engineer could do land surveys ... | |
| Cracking | 10/8/2010 |
| Q: Sir, Is there any chance for cracking the roof due to the problem in foundation..? ANSWER: Hi ... A: Yes, that is possible, as the column is under compression and tensile/bending stresses may not arise ... | |
| Cracking | 10/7/2010 |
| Q: Sir, Is there any chance for cracking the roof due to the problem in foundation..? A: If the foundation has significant differential settlement (for example between one corner and ... | |
| mat foundation analysis & design | 10/6/2010 |
| Q: sir, How FEM is useful in analyzing a mat foundation?Is ANSYS can be used as finite element ... A: You can model the matt/raft sitting on springs (stiffness determined from ground investigations) at ... | |
| Large building w/o expansion joint/ Temperature effect | 10/6/2010 |
| Q: I have to design a mosque building of size 66mx66m without expansion joint. The temperature ... A: This is only a little bit larger than the recommended maximum of 50m, so I suggest you just include ... | |
| RCC FOR DAMS | 10/5/2010 |
| Q: PLEASE TELL ABOUT THE SPECIFICATIONS FOR COARSE AGGREGATE GRADING FOR RCC DAMS. ESPECIALLY IF YOU ... A: It's been a long time since I designed RCC dams, but from what I can recall, aggregates of up to ... | |
| Grillage Foundation construction | 10/2/2010 |
| Q: what is grillage foundation how it manufactured A: This is a type of foundation that looks like an up-side down slab with downstand beams in 2 ... | |
| Engineering Interview | 9/2/2010 |
| Q: Mr.Khan I Am A High school Student Hoping To Retain Some Information About Engineering In One Of My ... A: I have answered similar questions before, so I will cut/paste them below: ... | |
| Bridge and Culvert | 8/31/2010 |
| Q: please what are the difference between a culvert and a bridge A: A bridge is normally for longer spans and the deck is usually jointed with the piers/supports with ... | |
| column design | 8/28/2010 |
| Q: respected sir my question is about column.please explain me the designing of column,and how can we ... A: You need to work out the loading on the column floor-by-floor and then use the formulae in the code ... | |
| Slender column design | 8/27/2010 |
| Q: sir, i want to construct a rcc column 40feet high to sport the projection of slab over external ... A: For a column that tall, you will need to be carful about slenderness and buckling (unless the load ... | |
| Reinforcing Bars Sizes | 8/26/2010 |
| Q: Why don't we have a #12 (1.5 in diameter) bar. Similarly there is no #13,#15,#16,#17 bars in the ... A: Even in BS, there are only sizes of 6, 8, 10, 12, 16, 20, 25, 32 and 40mm. This is because you can ... | |
| Eccentric footing Design | 8/25/2010 |
| Q: Can i have image %26 calculation sheet with example for eccentric footings. I want complete ... A: I cannot send you an image, but the following will help you. This is a common problem for say a ... | |
| ETABS Staged Construction | 8/24/2010 |
| Q: I am using staged construction sequence in ETABS. I got ETABS to add the dead load of every story. ... A: Sorry for the late response. The following website should give you the necessary guidance: ... | |
| RCC Column design | 8/24/2010 |
| Q: how do you design a slender column. i mean the formula for the determination of the area of steel ... A: I am not familiar with BS 1880, but there are charts in BS 8110 Part 3, which you can use in ... | |
| beam spacing | 8/23/2010 |
| Q: salam sir,if we have a slab and we have to provide beam so what is the criteria for spacing between ... A: The beam spacing is determined mainly by the ability of the slab to span between without excessive ... | |
| Beam span & stress | 8/22/2010 |
| Q: what determine the max distance a stala beam can span i have the load 3KN/m the max stress 390N/mm ... A: I don't know what a Stala beam is, but basically the maximum any beam can span is usually limited ... | |
| Water tank | 8/22/2010 |
| Q: I would like to ask you the following 2 questions about water tank: 1-What is the minimum cover for ... A: Normally the minimum cover for water tank (without special treatment) would be around 40 mm for the ... | |
| project | 8/21/2010 |
| Q: sir ,i am a btech(civil) final year student i don't understand which topic should i select for ... A: You have not stated what subject you are interested in, but if it's structures, you could try: 1. ... | |
| Pad or Piles Foundations | 8/20/2010 |
| Q: Asalom o alikum Sir, What is the requirement for going shallow footing towards ... A: I am not quite sure I have understood your question, but the decision as to whether to use shallow ... | |
| mat foundation | 8/20/2010 |
| Q: Asalom o alikum Sir, what is the criteria in civil engineering for using mat ... A: This is quite complex, depending on soil conditions and how the loading is applied. However a ... | |
| Bill of Quantities | 8/19/2010 |
| Q: I want to know if there is any different between a BoQ prepared by a Quantitiy Surveyor with the one ... A: So long as the quantities are measured and described in accordance with the norms, there is no ... | |
| Etabs querries | 8/18/2010 |
| Q: I have few questions regarding ETABS, hope you can help me clear these points: 1.In the Global ... A: That depends on which code you use, but in any case you should proceed with the design and check ... | |
| alternative energy | 8/17/2010 |
| Q: I'm very interested in the study of alterative energy. I would like to someday create a sustainable ... A: I am not an expert in this field, but I know that this is a very topical subject and one that is ... | |
| rebars | 8/17/2010 |
| Q: salaam,sir my question is this that why we use circular rebars in our rcc works instead of any other ... A: Actually you can use any cross-section shape, but it just so happens that methods of manufacture ... | |
| Etabs querries | 8/16/2010 |
| Q: I have few questions regarding ETABS, hope you can help me clear these points: 1.In the Global ... A: 1. The reason you have a net support reaction is that temperature loading is an internal load, and ... | |
| Hollow pot construction | 8/14/2010 |
| Q: Am supervising a 0ne story construction in Nakuru-kenya with hollow pot slab. I have never seen it ... A: Hollow-pot slabs are essentially one-way spanning ribbed slabs, but the gaps between the ribs are ... | |
| Reinforced column and pad foundation | 8/13/2010 |
| Q: How do u calculate the safe ground bearing pressure and how is the imposed load determined in a pad ... A: You can get the safe bearing pressure either from local codes or technical literature (depends on ... | |
| hello | 8/12/2010 |
| Q: i want to ask questions may i know the source problems for the criteria below and suggest the ... A: These could be for various reasons, some of which could be: 1. Due to over-loading or rebar ... | |
| Final year project topics in Structural analysis and Design(Both by using Steel and Concrete) | 8/12/2010 |
| Q: Good day sir, I am final year civil engineering student …..Actually I am confused in selecting the ... A: I (and fellow experts) have answered this question many times before- please browse my past answers ... | |
| Foundations | 8/11/2010 |
| Q: if i have 25' by 14' bay and i want to design a footing for one of its columns (assume all columns ... A: This question is a bit too long and complex to help you in detail, but form my experience an ... | |
| volume - formula for trapezoidal footing | 8/9/2010 |
| Q: what is the formula for finding the volume of concrete for isolated trapezoidal footing??? please ... A: Take the lengths of the 2 parallel sides, add and divide by 2. Then mutiply this figure with the ... | |
| Safe working load for steel wire | 8/9/2010 |
| Q: I need to find out how much weight a piece of wire will support. The wire has a diameter of 0.18mm. ... A: Wire rope capacities are difficult to work out and are usually stated in a table by the ... | |
| tie runner in steel truss | 8/7/2010 |
| Q: Good day to you//// what is the use of tie runner in the steel trusses.and how can I design it.Is ... A: I am sorry but the drawing is too small to see and this is not a terminology I have come across. If ... | |
| project topis | 6/19/2010 |
| Q: m a final year student frm civil engg.. actually i m confused in selecting d project topic, i m ... A: I (and fellow experts) have answered this question many times before- please browse my past answers ... | |
| new technologies in civil engg | 6/8/2010 |
| Q: M searching for a topic for my seminar related to new technologies in environment & traffic solution ... A: I am not an expert in environment or traffic, but some new technologies in structures are: 1. ... | |
| EC 8 Response Spectrum -ETABS 9.6 | 6/1/2010 |
| Q: I am using EC 8 for seismic analysis of a building. I have set up a response spectrum as per site ... A: It is very difficult to advise you without looking at the model in detail. One reason that you could ... | |
| Structural Steelwork Connections | 6/1/2010 |
| Q: My question is like this: In steel structures, the joinery also have to be strong enough as the ... A: Joinery is a terminology used mainly in timber connections/carpentry. For steel structures, this is ... | |
| Footing Depth | 5/31/2010 |
| Q: What is the formula or thumb rule for calculating the depth of Footing slab for RCC column when the ... A: If you mean thickness, basically you need to work out the plan area and shape of the footing based ... | |
| deck slab thickness | 5/30/2010 |
| Q: my bridge deck slab thickness has to be increased to 300mm thick (drawing - 180mm) due to the ... A: The short answer is yes, it should be OK. You can work out the additional self weight and see what ... | |
| Mathematics required in civil engg.?? | 5/29/2010 |
| Q: I am civil engg student and just completed my 1st year. I am quiet afraid of mathematics. I just ... A: I know how you feel because I felt the same. You will be pleased to know that you do not need to be ... | |
| blinding concrete | 5/27/2010 |
| Q: MR/Arshad, I would like to inquire from you, if we can cast the blinding concrete one after another ... A: Blinding concrete is required just to form a level base for the waterproofing layer and for placing ... | |
| Foundation in mass concrete | 5/27/2010 |
| Q: i am designing a power house structure which is 35 am high( span is 22 m).the dimension of columns ... A: This depends on whether the columns have much moment at the base and whether the mass concrete can ... | |
| dissertation titles | 5/26/2010 |
| Q: Khan I am trying to find a good dissertation title in civil engineering and i am mostly interested ... A: I think your subject matter is vry topical and could certainly be an interesting one to pursue. I ... | |
| Tension lap and compression lap | 5/25/2010 |
| Q: I would like to ask what is tension lap and compression lap for reinforcement bar lapping? Thank ... A: This is the length of over-lap required for rebar in order to safely transfer the stress/load for ... | |
| CHS Base Plate | 5/24/2010 |
| Q: How do we check for a CHS (circular hollow section) base plate with a hole at the center? The CHS is ... A: In that case, you just divide the axial load by the area of the base plate (excluding hole) and ... | |
| modelling in etabs | 5/24/2010 |
| Q: Good day. During modelling a flat plate slab in etabs I found many of my edge beams near the bottom ... A: This is very difficult to answer without reviewing the model. One thing you should do is use ... | |
| long span trusses | 5/24/2010 |
| Q: Assalamu alaykum! It's good that muslim specialists in sciences are expanding... Could you help a ... A: You are correct that some idealisation is not accurate- such as assuming all joints in trusses as ... | |
| Self supporting helical staircases | 5/23/2010 |
| Q: can you give me a guide for the analysis and design of self supporting helical stair? thank you. A: This is quite complicated and normally one would use either empherical formulae/tables, as per the ... | |
| civil engineering | 5/22/2010 |
| Q: I'm a student entering into final year of my engineering. What kind of project shall i do?? I have ... A: You have not mentioned which aspects of civil engineering interest you most, but if this is in ... | |
| long span trusses | 5/22/2010 |
| Q: Assalamu alaykum! It's good that muslim specialists in sciences are expanding... Could you help a ... A: 1. As far as trusses are concerned, simply supported and hinged at the supports is the same thing. ... | |
| raft foundation | 5/20/2010 |
| Q: how i can design raft fondation ,please send me a complete design example. A: I cannot send you a design example, but if you are asking about the principles, then basically you ... | |
| FEA for slab and beam structures | 5/20/2010 |
| Q: I am a final year student from Russia. I'm interesting of finite element design slab and beam floor. ... A: For modelling floors and beams, there are several good software packages available, such as ... | |
| Design Review Rates | 5/19/2010 |
| Q: what is the recommended hourly rate for professional fees in Kenya for small consultancy jobs that ... A: It has been over 10 years since I last worked in Kenya, so I regret that I do not have any idea of ... | |
| steel cantilever shelter for 3 cars | 4/28/2010 |
| Q: I have to design a steel cantilever parking for 3cars. What are and how do I calculate loadings that ... A: In Mauritius, as you will not have any snow loading, the main loading will be self-weight, some ... | |
| Concrete and steel columns | 4/28/2010 |
| Q: Good day to you// I have to design a steel structure having one roof with steel columns and concrete ... A: You can do a proper analysis so long as you define the section properties correctly and you take ... | |
| final year project | 4/27/2010 |
| Q: Good day sir. I am a final yr student of civil engineering in Nigeria interested hn doing my project ... A: I (and fellow experts) have answered this question many times before- please browse my past answers ... | |
| structural analysis & design | 4/25/2010 |
| Q: What load factors shall be considered in P delta analysis using Etabs ANSWER: Hi Mohammed, ... A: I think you need to follow the recommendations of the code you are using, whether it is BS 8110, ... | |
| Rebar per cubic meter in RCC | 4/24/2010 |
| Q: How much steel required in one cubic meter Reinforced Cement Concret (RCC)i mean the steel quantity ... A: This really depends on what part of the structure your are talking about, and can vary from about 60 ... | |
| Final Year project topics | 4/23/2010 |
| Q: I'm in my final year. I need your assistance in get a project topic on highway engineering or ... A: I am not an expert in highway/transportation, but my answer below may give you some ideas relevant ... | |
| Support under plinth beams | 4/19/2010 |
| Q: In the drawings of a G +2 storey school building, it is shown that under the external plinth beams a ... A: If by PCC you mean a 50 to 75mm thick layer of weak concrete, then this is what we call blinding and ... | |
| structure | 4/17/2010 |
| Q: assalamualaikum sir thanks for u r valuable answers. SIR PLEASE TELL WHAT IS ROBUSTNESS OF A ... A: Robustness is defined as the inherent property of a structure so that it does not suffer from ... | |
| expansion joint provision for large water retaining structure | 4/17/2010 |
| Q: "if the walls and slabs are designed properly for early-age shrinkage cracking, then you do not need ... A: Jonathan, Basically this design takes account of the prevailing weather conditions, the ... | |
| Staggered reinforcement in raft | 4/16/2010 |
| Q: I want to ask what are the benefits of using staggered reinforcement in raft foundation and why some ... A: The main advantage of staggered rebar lapping is to avoid rebar congestion at localised zones and ... | |
| shear wall | 4/16/2010 |
| Q: assalamualaikum sir sir pl. tell me that what will happen to base shear in a building if we ... A: I presume you mean that the shear wall will not continue down to ground floor and the foundations? ... | |
| Green Buildings | 4/14/2010 |
| Q: hope u r fine am a 3rd year student am intrested in doing final year project in green buildings itz ... A: Yes, this is a hot topic so a good one to pursue. If you do a search on Google.com, you will find ... | |
| Structural Software | 4/13/2010 |
| Q: assalamualaikum sir why staad pro. does not give accurate results for analysis for building having ... A: All the sofware packages you have listed are merely tools- if the input is incorrect the ouput is ... | |
| Foundation on Fill | 4/13/2010 |
| Q: Our site is a small part of very large flat flood basin 30 km from the sea. The permanent water ... A: I am not an expert in geotechnics, nor have you given enough data. The answers depend on the ... | |
| Different questions | 4/13/2010 |
| Q: I hope that you are fine and keeping good. My questions are, In pitched room, what acts as diaphragm ... A: If you are asking about ETABS, there will be no diaphragm in a pitched roof- you just rely on the ... | |
| raft foundation | 4/12/2010 |
| Q: hw to design circular raft foundation A: This is quite complex, depending on soil conditions and how the loading is applied. A raft ... | |
| Raft pile foundation design | 4/12/2010 |
| Q: I am a structure student, studying a model on ground engineering. I have to build the pisa tower as ... A: This then depends on the pile capacities vs length and diameter. If you can cater for all loading ... | |
| Mass Vs. Weight in ETABS | 4/11/2010 |
| Q: I am using ETABS for modeling an irregular multi-story structure. Seismic load lateral system for ... A: The discrepancy could be due to several reasons, such as definition of mass source (menu>Define>Mass ... | |
| Cantilever Retaining Wall | 4/11/2010 |
| Q: In a cantilever retaining wall, the stem design moment is A: This sounds like a homework question, which you really should learn the baics of yourself before ... | |
| Water flowing in hole in concrete floor | 4/8/2010 |
| Q: I don't know if you can help w/ this. If you can't perhaps you could steer me in the right ... A: I am not an expert in this, nor do I have enough info on the building/surroundings etc, but have you ... | |
| dynamic seismic load | 4/8/2010 |
| Q: Good day to you sir. Is Etabs can automatically consider the dynamic seismic load? or how I can do ... A: Not automatically- you have to use the RSA mode and then input the appropriate data in order to do ... | |
| Strap Footing | 4/7/2010 |
| Q: Sir, I have a problem designing an isolated footing for a 400mmx600mm RC column because of large ... A: This depends on the relative stiffnesses of the sub-grade, the pad footings and the strap beam. It ... | |
| Civil Structural Engineer | 4/7/2010 |
| Q: I want to design residential building for that i want to know what is the formula of calculation ... A: Fot calculating loads, you need to assess the self (dead) weight of the structure by calculating the ... | |
| Rigid foundations | 4/5/2010 |
| Q: please give me the answer to this question and I'll be very grateful the question is: when we ... A: This is based on engineering judgement and depends partly on what the supporting strata is and also ... | |
| structural Engg | 4/5/2010 |
| Q: sirA.O.A. i am in the process of designing a rcc structure with 9m column grid spacing on each ... A: This depends on the live loading and also usage of the floor (defelction criteria). You may find ... | |
| structural engineer | 4/3/2010 |
| Q: how can i control in very thick raft (3.50m)thickness to avoid high temperature borned in internal ... A: The main control measures are: 1. Use up to 60% cement replacement(pozzalana, pulverised fly ash, ... | |
| Repair of Column Cracks | 4/3/2010 |
| Q: .im a newly licensed civil engineer in the Philippines..im about 23 and still an amateur in the ... A: You have not indicated whether this is a new or old construction. If it is old, vertical cracks ... | |
| shear pins | 4/3/2010 |
| Q: I am sudha,i want the details about shear pins,what is the importance of shear pins,in which ... A: This is not a terminology I have come across in RC, apart possibly from pre-cast sections ... | |
| Structural enginering how to design piles caps which can support more than five piles | 4/2/2010 |
| Q: I am a structural engineer here in Dubai Now i have faced to design a pile cap which can transmit ... A: Actually you can design a pile cap with up to 5 piles (5th one directly under the column in the ... | |
| Thickness of PT Slab | 4/2/2010 |
| Q: Even though my sense tells me this correct also, my engineers tells me otherwise after they have ... A: If your Adapt design is showing thickness and rebar, you also ned to take account of the costs of ... | |
| SAP 2000 | 4/1/2010 |
| Q: Esteemed Sir, Aadab. Sir i have to analyze an isolated RCC Footing using SAP2000.The problem is ... A: For isolated footings, use SAP 2000 only if you want to do detailed FEA analysis, otherwise it is ... | |
| End Releases In ETABS | 3/31/2010 |
| Q: Assalam o allaikum sir again , how r y ? hope you are fine inshALLAH , Sir i have one more question ... A: In practical terms it is not possible to construct such a junction without any moment transfer ... | |
| Hidden Beams | 3/31/2010 |
| Q: what is hidden beam in a slab or merged beam ? i need the placement of reinforcment is slab and beam ... A: A hidden beam is also known as a flush or merged beam, usually used to support slabs that are either ... | |
| Any way to obtain a licence certificate in Civil Engg. | 3/29/2010 |
| Q: I own a construction company and i'm in this field for the last 12 years involved in residential ... A: That depends on how the site boundary markers are placed and what distances are shown on the layout ... | |
| Steel shuttering Design | 3/28/2010 |
| Q: Dear sir pls tell me design calculation for steel shuttering? A: This can be designed using the locally applicable standard on structural steelwork, but when ... | |
| Transverse Reinforcement Critieras for Simply Supported Flexural Members | 3/26/2010 |
| Q: Assalam o allaikum , i m a big fan of yours , you have a huge amount of knowledge mashALLAH , May ... A: I am not sure which 4 criteria you speak of, but perhaps you mean lateral reinforcement? Lateral ... | |
| Any way to obtain a licence certificate in Civil Engg. | 3/26/2010 |
| Q: I own a construction company and i'm in this field for the last 12 years involved in residential ... A: Yes, there are lots of colleges that offer distance learning, such as: ... | |
| Depth. of foundation | 3/26/2010 |
| Q: Sir, Please tell me what could be the max and minimum depth of any foundation in normal Indian ... A: This really depends on gound conditions and annual weather conditions. For example, on good rock, ... | |
| PT Slab Cost Effectiveness | 3/26/2010 |
| Q: Dr Khan, I am told that PT slab is the most cost effective structural system, but I am a little ... A: You are quite correct. In purely terms of materials (concrete/rebar), RC slabs are more economical ... | |
| roof slab design | 3/26/2010 |
| Q: Good morning Sir, I need RCC roof slab design procedure thanks Ashraf A: This is too general a question, but this may assist you(RC roof design is similar to floor design, ... | |
| Seeking project guidance | 3/24/2010 |
| Q: Sir, Our project is on Non-Linear Finite Element Analysis on raft foundation.We are using ANSYS ... A: I am not familiar with ANSYS, but most FEA software work on the principle of beam on elastic ... | |
| Question on Mass Underground Transportation Idea | 3/24/2010 |
| Q: Hey Mr. Khan - I have a question regarding an idea that I can not get out of my head. I love ... A: The concept is technically feasible but will be very expensive and hence not financially viable. ... | |
| Tie Beams | 3/24/2010 |
| Q: Sir, I live in Seismic Zone V area (Guwahati, India) and am building a 3 storey building.The columns ... A: This is difficult to answer as it depends on various aspects. However, generally the tops of tie ... | |
| How to calculate area of tunnel | 3/23/2010 |
| Q: Sir, I have a doubt of calculating area of tunnel of d shaped and horse shoe shaped tunnels can you ... A: The best way to do this is to divide up the X-section shape into a semi-circle, a rectangle and ... | |
| civil | 3/22/2010 |
| Q: Sir i have drawing of a building which is designed on isolated footing which consisit 3 types of ... A: Your question is not very clear, but in any case floor slabs are not normally cast straight on top ... | |
| Redesign of pile cap | 3/22/2010 |
| Q: I am an Assistant RE on one construction site in Malaysia. Recently the RC driven pile refuse to set ... A: If the column vertical reaction remains on the position of the original 300x300 stump, then ... | |
| canal building | 3/22/2010 |
| Q: I am trying to find how much the water canal building costs if dimension is 800 kilometers long, 200 ... A: This question is difficult to answer because it depends on the design of the canal (whether it is ... | |
| future career | 3/19/2010 |
| Q: .im a newly licensed civil engineer in the Philippines..im about 23 and still an amateur in the ... A: I would not paint such a pessimistic picture- Civil Engineering is a fantastic career, with lots of ... | |
| ETABS MODEL.. Different Questions | 3/18/2010 |
| Q: Please review the etabs model . THe link is ... A: I could not open the zipped folder (says it is empty), but in any case your strange results may be ... | |
| Expansion/ construction joint in RCC retaining wall | 3/18/2010 |
| Q: i am a.l.Baiju, i have one doubt, in the RCC retaining wall (height about 2m to 3m maximum), at what ... A: This depends on whether the retaining wall is exposed to the weather (in direct sunlight, etc). If ... | |
| steel column footing | 3/9/2010 |
| Q: While designing a footing for a steel column for a warehouse ,do we need to consider the moment at ... A: This depends on the detailing of the joint- if it is a true pin joint, then the answer is no; ... | |
| Shear design for slab in SAFE | 3/7/2010 |
| Q: Currently i am using SAFE as tool to design based slab. I notice that output have no shear ... A: If you are using SAFE v12, and if you invoked Run>Analysis & Design (instead of just Run>Analysis), ... | |
| Two Way Continuous Slab | 2/24/2010 |
| Q: i want to know that in two way continuous slab for extra top reinforcement over support,for 1st span ... A: This is a difficult question to answer as it depends on how the slabs have been analysed and what ... | |
| concrete slab | 2/24/2010 |
| Q: I would like to design a 9m x 6m concrete slab to carry a container weighing 6tons. May you help me ... A: Due to liability reasons I do not do actual designs over this forum, just give advice. I presume ... | |
| concrete 2 nd floor | 2/24/2010 |
| Q: i am building a house in the country without plans,the local contractor is very experienced,but as ... A: Firstly, if you have not water-proofed the earth-retaining wall then your storage area will always ... | |
| EATBS Slab Moments in Beams | 2/24/2010 |
| Q: Last time, I have asked you about mesh slabs which using membranes. And thank you very much for your ... A: Your image is not clear enough to see the figures, but looking at the BM diagrams, I suspect the ... | |
| Regarding the Bill Of Quantity. | 2/23/2010 |
| Q: I am Jijo JOhn working in Muscat as a Quantity Surveyor. I have one doubt is that in BOQ one item ... A: Any amounts mentioned against "Item" or "Lump Sum" are usually not re-measured as the prices are ... | |
| Formula for calculating raft foundation thickness | 2/22/2010 |
| Q: I am trying to determine if there is a standard formula/calculation to determine concrete raft ... A: I am afraid there is no such standard formula, as the raft thickness is determined by various ... | |
| expansion joint | 2/22/2010 |
| Q: I have been wondering how expansion joint is introduced in long spans (500m) cable-stayed ... A: Yes, in long span bridges, the expansion joints are usually located where there is minimum moment. ... | |
| calculating levels | 2/20/2010 |
| Q: if my datum mark is 38.085 invert level 36.320 cover level 37.485 what would be the depth to dig and ... A: The depth to dig is 37.485-36.320= 1.165m plus depth required for the pipe and any bedding. The ... | |
| Raft foundation design. | 2/20/2010 |
| Q: Salam. i have modelled & analysed a G+10 storey structure in Staad-pro by providing plates for the ... A: In that case you have 2 options only- drop the raft by incorporating a basement, or use piles. ... | |
| Building a Deck | 2/19/2010 |
| Q: How far apart can I space 8x8's or 12x12's as opposed to 6x6's for the pillars that will support a ... A: This really also depends on the sizes of the horizontal cross-members (beams) as they need to be ... | |
| Continuation of last question | 2/19/2010 |
| Q: If the 165mm slab that is there had steel reinforcing bars in it, either 1 or 2 layers would that ... A: The presence of rebar will only have a small influence on performance of the slab, as that depends ... | |
| Industrial building slab strength | 2/19/2010 |
| Q: I am working on a project to move a number of separate business units to a single site. The site is ... A: Yes, your assumption could be correct, but this depends on the loading the slab has been subjected ... | |
| Industrial building slab strength | 2/19/2010 |
| Q: I am working on a project to move a number of separate business units to a single site. The site is ... A: If the slab is only 165mm thick, then the subgrade will need to support more than 200 kN/m2. Without ... | |
| Industrial building slab strength | 2/18/2010 |
| Q: I am working on a project to move a number of separate business units to a single site. The site is ... A: If the weight is evenly distributed amongst the 6 feet, then the static pressure under each foot is ... | |
| Raft foundation design. | 2/18/2010 |
| Q: Salam. i have modelled & analysed a G+10 storey structure in Staad-pro by providing plates for the ... A: If the 238 kN/m2 is fairly localised, then you need not worry too much as this will re-distribute ... | |
| Cube & cylinder Tests | 2/17/2010 |
| Q: Sir, may i know that where we should use Cylinder for testing concrete and where we should use ... A: There is no difference when it comes to quality control- one system is common in the USA whilst the ... | |
| beam span | 2/16/2010 |
| Q: please how do i go about solving a problem thus;optimization of the span of steel cantilevered ... A: Perhaps you mean how to optimise the design of a cantilever steel beam for a specific span and ... | |
| Expansion joint in huge water concrete tank | 2/16/2010 |
| Q: Do we need expansion joints in walls or base slab for an RC above ground water tank of internal ... A: No, if the walls and slabs are designed properly for early-age shrinkage cracking, then you do not ... | |
| estimation buildings | 2/15/2010 |
| Q: estimations is important in engineers so that i need to know how to calculate roofs, slabs ANSWER: ... A: For a complete estimation, the following need to be worked out: Site clearance, excavations, ... | |
| Structural design of flat slab | 2/14/2010 |
| Q: Deflection of flat slabs, 1.How do i take or measure the critical span length to calculate for ... A: 1. You will need to use your engineering judgement on that- you can always choose 2 or 3 alternative ... | |
| civil technology project | 2/12/2010 |
| Q: sir, i am in btech civil engg first year only, but highly interested in projects related to ... A: The only projects I can think of combining "electronics" and civil engineering are: 1. Using strain ... | |
| Stone Wall Holes | 2/11/2010 |
| Q: Sir, for construction of over head tank on old stone building Consultant suggest us that ... A: I am not quite sure how drilling holes and putting rebar will support a tank, but so long as the ... | |
| Water Pressure | 2/10/2010 |
| Q: I hope that you are fine and keeping good. My Question is that, we have to design a Steel ... A: Upthrust or floatation is only a problem when you construct a basement or tank or swimming pool ... | |
| boundry wall | 2/10/2010 |
| Q: i need to construct a hollow block work boundary wall 4.5 meters high adjacent to my neighbors ... A: This is quite a complex problem with potential danger of undermining the neighbors wall foundations. ... | |
| Degree Of Freedoms | 2/9/2010 |
| Q: I need to know the Degree Of Freedoms of Shell Elements, Plate Elements and Membrane Elements. ... A: This info is available in the ETABS help menus: ********************** Type options. A wall or slab ... | |
| suggestion for a project topic | 2/8/2010 |
| Q: I am a final year student in Civil Engineering. I am thinking of developing an idea for a project ... A: I am not an expert in this field, but relating to structures, you could look into: 1. Effect of ... | |
| estimation buildings | 2/6/2010 |
| Q: estimations is important in engineers so that i need to know how to calculate roofs, slabs ANSWER: ... A: Iron and asbestos roof sheets are normally measured in m2 along the slope and then you need to add ... | |
| structural beam design. | 2/6/2010 |
| Q: I NEED TO DESIGN A H-BEAM TO CARYY A LOAD OF 1.5TONS SIMPLY SUPPORTED ON BOTH THE ENDS AND SPAN IS ... A: Due to liability reasons I do not do actual designs over this form, but just give advice. You have ... | |
| Ask about dynamic, slab | 2/5/2010 |
| Q: It it the first time I ask you so I hope you willing to answer me! 1/ I have a difficult in analysis ... A: I don't know what the precise problem is, but use the Help menu to find the solution. Maybe you need ... | |
| Ask about dynamic, slab | 2/5/2010 |
| Q: It it the first time I ask you so I hope you willing to answer me! 1/ I have a difficult in analysis ... A: You appear to have done the modelling OK and can use the 2 sets of modal info to analyse for ... | |
| single column pad foundation | 2/4/2010 |
| Q: I plan to build a 2 story house in Brazil with concrete post and beam construction and a single ... A: So long as the slope is original ground (i.e. not fill), then you can step the foundations down to ... | |
| Chemistry for Civil Engineers | 2/4/2010 |
| Q: I read your last chat with Mahommad please elaborate more on the matter and where els can we use ... A: In addition to that, you can also use chemistry to check the quality of soils for foundations and ... | |
| Foundation of a house | 2/4/2010 |
| Q: Csn u please suggest me a website where I can get basics of building a house, specially about laying ... A: Yes, you can use the foundation as a basement but if the water table is high you will need to ... | |
| Shell Elements | 2/2/2010 |
| Q: I wud like to know why do we assign slabs with beams as a membrane,flat slabs as a shell and raft ... A: If you are referring to ETABS, please go the the help section and it is all explained there. Also, ... | |
| designing beam | 2/1/2010 |
| Q: Arshad, While analyzing a multi span frame using some software, we get values for stress. We reduce, ... A: Without looking at this in detail, due to creep effects, and natural re-distribution, I would ... | |
| Pipe Bridge Detail Design | 1/31/2010 |
| Q: I have to design a pipe bridge for a water treatment plant. I have not idea where to start with this ... A: The most common/easy type of bridge for this is a truss bridge. Check these sites: ... | |
| Eccentric foundation | 1/29/2010 |
| Q: Sir, i want to place a column of a proposed frame structure adjascent to a load bearing wall of ... A: For this, you can provide an eccentric foundation and counter-balance the out-of-balance moment ... | |
| Slab | 1/28/2010 |
| Q: i hope you will be fine and good. Please tell me that what is one way slab and two way slab ... A: I think you need to study a book on basic design. One way slab means that all the loading is ... | |
| RCC wall retaining Scrap | 1/26/2010 |
| Q: I hope that you are fine and keeping good. I have to design a RCC Chamber which will serve to store ... A: This is an unusual type of loading and it really depends on size/shape of the pieces. The lateral ... | |
| Steel formula | 1/26/2010 |
| Q: please tell me that what is the formula of steel in RCC. A: This is quite complex and varies on whether you are designing beams or columns or walls. I suggest ... | |
| box culvert design | 1/25/2010 |
| Q: pls kindly show me reinforcement details of double cell culvert size 1.5*1.5mts lengths ... A: Jambo Aliyu, Please refer to my earlier answers to a ... | |
| help to build black pool | 1/20/2010 |
| Q: Dr.Arshad We are constructing a Pool. Our architect has intention to have black pool bed.We have ... A: Firstly, if you apply a plaster or screed you need to ensure that the concrete base has fully dried ... | |
| senior project | 1/19/2010 |
| Q: Arshad. I am Hani. I am a senior student from Bahrain in the middle east. I have an idea for my ... A: Here are three suggestions for connections in steel structures: 1. Welded compared with bolted ... | |
| Overlapping | 1/19/2010 |
| Q: Please tell me that whats the perfect formula to find out overlap for coulmns & beams. A: You have not clarified whether this is for RC structures and the lapping you are asking for is for ... | |
| RC Beams/columns sizing | 1/18/2010 |
| Q: respected sir this is my first mail to you. i wants to know that while fixing the dimension of ... A: You have not mentioned whether this is for steel or RC structures. The latter is more complicated, ... | |
| Expansion joints | 1/16/2010 |
| Q: I am doing under ground powerhouse structure design.Its my first job.my question is what are the ... A: If this is a buried structure, you do not need any expansion joints as the temperature will be ... | |
| Details about Under ground structures | 1/16/2010 |
| Q: I am doing under ground powerhouse structure design.Its my first job.my question is what are the ... A: You need detailed site investigations data so as to determine soil properties and water table, so ... | |
| moment redistribution | 1/16/2010 |
| Q: Arshad, While analyzing a multi span frame using some software, we get values for stress. We reduce, ... A: If you design the span with 37.56 kNm as a recatngular section you will get a certain amount of ... | |
| Gantry Col Design | 1/16/2010 |
| Q: I require good references, prefably design examples on how to design built up column sections. I ... A: A good reference is the Steel Designers Manual: ... | |
| moment redistribution | 1/15/2010 |
| Q: Arshad, While analyzing a multi span frame using some software, we get values for stress. We reduce, ... A: Redistribution is normally done in RC frames, not so much in steel frames, unless it is for ... | |
| 1st year thesis topic about Civil Engineering | 1/15/2010 |
| Q: Khan I'm KIEL can you give me some thesis topic anything about Civil Engineer I'm just only 1st year ... A: This is such a vast subject so really you should select a topic that interests you. Some examples: ... | |
| FLATSLAB THICKNESS | 1/15/2010 |
| Q: What flat slab thickness do I assume for a shopping floor with column supports in a grid spacing of ... A: This really depends on various factors, such as: 1. Whether you can use column heads/drop panels or ... | |
| Civil jobs | 1/15/2010 |
| Q: Good evening; I was wondering if you can help me with possible jobs for myself with my situation? I ... A: You should have no problems whatsoever in pusuing a very successful career in civil engineering. So ... | |
| slab design | 1/14/2010 |
| Q: i need to design a reinforced concrete slab to go on top of a box culvert.the arrangement is culvert ... A: This really depends on what loading the culverts have been designed for- if they are for use in ... | |
| Wind Loading on sloping surfaces | 1/13/2010 |
| Q: I hope that you are fine and doing good. My Question is regarding how to calculate wind load on ... A: This is quite a complex subject and you need to study the codes of practice on wind loading in order ... | |
| masters project topic | 1/12/2010 |
| Q: Khan I am a civil engineering graduate who wants to have his masters in structural engineering from ... A: If you type these subjects in Google, you will get a lot of research/reference material. Regarding ... | |
| frame analysis | 1/12/2010 |
| Q: While designing a building, we generally analyze a frame consisting of footing, columns and ... A: 1. Yes, column rebar can be different in different planes/axes- it is normally equal in opposite ... | |
| frame analysis | 1/12/2010 |
| Q: While designing a building, we generally analyze a frame consisting of footing, columns and ... A: Normally if you design a frame as 2-D, then you have to assume that stability in the orthogonal ... | |
| THESIS | 1/11/2010 |
| Q: I m working on my PG Thesis titled 'Effect of eccentricity on analysis and design of isolated ... A: This seems to be a simple and straight forward topic, and you may wish to consider following ... | |
| Earthquake design | 1/11/2010 |
| Q: I have heard that in japan rubber can be used as a shock absorber in case of an earthquake. My ... A: There are 2 ways that rubber can be used to mitigate effects of earthquakes: 1. As visco-elastic ... | |
| MBA after BE(civil) | 1/10/2010 |
| Q: I am BE(civil)2009 passout.want to know that whether I shuld further do MBA and in which area of ... A: This really depends on what subjects you are interested in. I would recommned that you do at least ... | |
| Bc value ACI 21.4 | 1/9/2010 |
| Q: ACI 318-05 Eq 21-3 and 21-4 are used for determining the minimum area of transverse reinforcement to ... A: I have not used this clause, but from first principles I would reckon that the smaller dimension is ... | |
| Minaret Design | 1/9/2010 |
| Q: I hope that you are fine and doing good. My Question is regarding Minaret Design. While desiging ... A: As the minaret is not normally considered to be habitable, the overall deflection due to ... | |
| waterproofing | 1/9/2010 |
| Q: Respected sir i want to ask the procedure of roof waterproofing and wet areas waterproofing. and ... A: These two areas are similarly waterproofed by using either bitumen or rubber linings, and then ... | |
| Minaret Design | 1/9/2010 |
| Q: I hope that you are fine and doing good. My Question is regarding Minaret Design. While desiging ... A: You are correct that a lower C of G and wider deeper base will assist for stability, especially if ... | |
| Concrete Strength | 1/7/2010 |
| Q: Top five floors of a 11 story building are to be removed / demolished, what would be its effect on ... A: As all the live-loading for the upper 5 storeys will not be in place, the columns/shear walls below ... | |
| Design of RC Column | 1/7/2010 |
| Q: I want to construct a small change room of size 8.00 x 4.48 x 3.00 mtr size(outer wall ... A: You have not given sufficient info to me, but in any case you can do the calculation as follows: 1. ... | |
| Thesis Topic | 1/7/2010 |
| Q: I'm a graduate of architecture and currently undergoing a master's degree program in civil ... A: One type of pre-fabricated building system that is catching on in Europe is the twin-wall system ... | |
| pier design | 1/6/2010 |
| Q: I am doing Intake structure design,it consist of 6 piers inclined at 78 degree with unsymmetrical ... A: Without knowing the exact geometry of the piers, I would guess that you need to design them as ... | |
| container office | 1/6/2010 |
| Q: i have to design a container office.I already designed the foundations by considering the load ... A: The only uplift you will get is from high cross wind loading, that may give rise to suction on the ... | |
| sand bulkage | 1/4/2010 |
| Q: if i get a sand bulk-age is minimum or maximum from specified limit what is the further action in ... A: The best way to avoid problems with bulkage is to do weight-batching rather than volume batching. If ... | |
| Swimming pool design | 1/3/2010 |
| Q: What are the basic things need to be considered while designing a swimming pool.shall I get an idea ... A: The design of a swimming pool should be done from first principles, as it is relatively simple- no ... | |
| Center of mass in Etabs | 1/3/2010 |
| Q: Can u let know the difference between centre of mass and centre of rigidity.Also how to see these ... A: Centre of Mass location depends on the geometry of the building, as well as distribution of weight ... | |
| Center of mass in Etabs | 1/2/2010 |
| Q: Can u let know the difference between centre of mass and centre of rigidity.Also how to see these ... A: If you have a completely symmetrical structure in terms of slabs, columns, lift-core walls, slab ... | |
| Design "R" letter shape by reinforced concrete | 1/1/2010 |
| Q: It's required to design "R" letter shape by reinforced concrete How can I design this? I want to ... A: The structural system will be as follows, if only gravity loading is considered (i.e. no lateral ... | |
| retaining wall | 12/30/2009 |
| Q: I want to cast 24 meter long 3 meter high and 250 thick retaining wall in one pour.Consultant ... A: You can pour the full length, but your design for the distribution (horzontal) rebar will need to ... | |
| senior project | 12/29/2009 |
| Q: Good morning Dr.Arshad Khan I am Hani from Bahrain in the middle east. I am doing my senior project ... A: This really depends on what interests you most, but here are some suggested subjects: 1. Modern ... | |
| floating slab | 12/29/2009 |
| Q: While considering a floating slab for the footing of a small building what are things to be ... A: I don't quite understand what you mean by a floating slab/footing. If you mean a raft slab/footing, ... | |
| Structures & detailing | 12/28/2009 |
| Q: I am am ruwan I Gawe me instruction "FOUNDATION Design" (raft foundation,Pad foundation & ETC) ... A: In oredr to understand that, please study some books on RC design- this is too big a subject to ... | |
| DEFLECTION IN RC SLAB | 12/28/2009 |
| Q: ARSHAD WE HAVE 26 CM POST TENSION SLAB , BUT AFTER 3MONTHS SINCE WE HAVE CASTED THIS SLAB WE NOTICE ... A: From what I can make out, this is a flat slab and the span in question is an end-span. In this case ... | |
| DEFLECTION IN RC SLAB | 12/28/2009 |
| Q: ARSHAD WE HAVE 26 CM POST TENSION SLAB , BUT AFTER 3MONTHS SINCE WE HAVE CASTED THIS SLAB WE NOTICE ... A: You have not indicated whether the span in question is on-way or two-way spanning, continuous ... | |
| subgrade modulus to area springs | 12/28/2009 |
| Q: Sir, Good day to you. How can I convert subgrade modulus to area springs in etabs. A: So long as you have consistent units (i.e. Force/Length3 ), then all you need to do is assign the ... | |
| masonary infils | 12/27/2009 |
| Q: my question is regarding infill wals . ubc requires to provide expansion joint between side face of ... A: You are quite correct- this detail is very important especially where the in-fill blockwork does not ... | |
| modeling of ground supported concrete slabs | 12/26/2009 |
| Q: i want to model ground supported industrial slabs using sap2000 software and then want prepare a ... A: 1. Meshing is dictated by overall slab proportions and any concentrated loading positions. There ... | |
| modeling of ground supported concrete slabs | 12/25/2009 |
| Q: i want to model ground supported industrial slabs using sap2000 software and then want prepare a ... A: In order to do this properly, you need to do full site investigations, including a plate-bearing ... | |
| Elevator Loading .Etabs | 12/24/2009 |
| Q: I am using lift core as concrete shear wall. My question is how to take the lift loading in the ... A: Yes, that is correct- normally this is 7.5 kN/m2 within the lift machine room space. You should ... | |
| Load Combinations Eurocode 8 | 12/23/2009 |
| Q: I hope that you are fine and keeping good. I have a 4 Story Building to design as per Eurocode 2 & ... A: I have not used Eurocode 8 much, but this website should assist you for load combinations: ... | |
| Foundation Design | 12/23/2009 |
| Q: I am am ruwan I Gawe me instruction "FOUNDATION Design" (raft foundation,Pad foundation & ETC) ... A: I do not quite understand what you are asking, but these websites should assist you: ... | |
| design of pile cap bridge using BS 8110 | 12/22/2009 |
| Q: can i use BS 8110 as a guide to design a bridge pile cap, instead of BS 5400. THANKS Ir ARSHAD! A: Technically there is no reason why you cannot use BS8110 for this, but you may need to check with ... | |
| Piles alignment with Pile Cap | 12/21/2009 |
| Q: 1. if the position of piles move what should i do with my column? what would happen 2my pile cap? ... A: The pile cap should remain positioned centrally on the piles. If the column cannot be re-positioned ... | |
| structural dynamics | 12/21/2009 |
| Q: In the book structural dynamics:theory and computation(2 edition) by mario paz,plz can u tell me how ... A: I do not have that book, but these websites should assist you: ... | |
| raft slabs | 12/21/2009 |
| Q: Good Morning from sunny South africa Sir. per my subject, please suggest where may download a ... A: The basic detailing of a raft is like that of a suspended flat slab, but upside-down. So, if you ... | |
| Slabless stair design | 12/21/2009 |
| Q: I hope that you are fine and keeping good.. I have to design a slabless staircase. I have googled ... A: This website has some suggested detailing: ... | |
| steel deck concrete on wood frame support | 12/20/2009 |
| Q: Mr. Arshad, I am at the initial stage of planning a residential family project, utilizing as many ... A: Corrugated sheets can be used as permanent shutters/formwork for RC slabs, and if they have any ... | |
| About civil engineering terms | 12/20/2009 |
| Q: could you tell something about civil engineering terms for example in the building type floors ... A: These websites will assist: http://diydata.com/general_building/building_glossary.php ... | |
| choosing of final year project | 12/18/2009 |
| Q: please, i would like you to give me project topics that i can choose from relating to reiforced ... A: Here are some suggestions: 1. High strength concrete 2. Durability of concrete. 3. Optimisation of ... | |
| pre engineering building | 12/17/2009 |
| Q: What is exactly a pre engineering building? Thanking you, A: A pre-engineered building is one that has its main structural members analysed, designed and sized ... | |
| thumb rule | 12/17/2009 |
| Q: how i i use thumb rule in construction & What is the specification for thumb rule. ANSWER: Hi ... A: I have already answered this question before,and explained that there are many variables that effect ... | |
| Mini/Micro dams | 12/16/2009 |
| Q: Is it at all possible to construct micro dams,specifically to catch rain water/run off in small ... A: Yes it is possible to construct micro/Mini dams, which could be made from either concrete of earth ... | |
| thumb rule | 12/16/2009 |
| Q: how i i use thumb rule in construction & What is the specification for thumb rule. A: There are many rules of thumb- you need to ask me a specific question about a specific subject so ... | |
| Study of RCC Design | 12/16/2009 |
| Q: Sir I am a Diploma Engineer.I want to learn Rcc Design in detail.Plz guide me.Plz let me know if ... A: Yes there is a lot of on-line learning material, such as: ... | |
| stone masonary | 12/15/2009 |
| Q: I want to construct 6m in height retaining wall in slopping please tell me bottom width & top width ... A: This depends on a lot of variables, such as type and compaction of soil to be retained, quality of ... | |
| Equipment Foundation | 12/15/2009 |
| Q: Good day to you. I am a civil engineer and working in Oil&gas projects. i would like to know about ... A: This is too complex a subject to describe in detail over this forum, but you can get info from the ... | |
| standerds of | 12/14/2009 |
| Q: I want basic standers limits in rcc work & how i get. A: Your question is not very clear but if you want some standards and basic guidance in RC design, then ... | |
| Void in foundation for a tree | 12/14/2009 |
| Q: I hope that you are fine and keeping good. Sir, I am designing a building inwhich the architect ... A: If you have a basement and the raft is at say 3m depth, then there may not be a need to provide a ... | |
| Void in foundation for a tree | 12/14/2009 |
| Q: I hope that you are fine and keeping good. Sir, I am designing a building inwhich the architect ... A: This really depends on the type of tree, as some have roots that grow downwards whilst others have ... | |
| tendering and estimating | 12/13/2009 |
| Q: method statment for rubble foundation construction activity? A: This should assist: ... | |
| Lift Shaft design | 12/13/2009 |
| Q: thanx for previous answers. While doing a G+5 Buiding with a basement ,I wanted to start the lift ... A: You can start from the GF, but you will still need a 1.5m (approx) deep pit for the lift over-shoot ... | |
| Rebar Lap Length in-case of welding | 12/12/2009 |
| Q: good morning, I would like to know what is the Lap Lengths for Welding, actually we fixed wall ... A: This really depends on what type of electrides and weld (shape/size) you use. However, if you are ... | |
| Concrete Setting and Strength Gain Rates | 12/11/2009 |
| Q: WHAT IS INITIAL & FINAL SETTING TIME OF CONCRETE OF PARTICULAR GRADE OF CONCRETE THAT IS ... A: This depends on a lot of variables such as temperature, humidity, cement content, water/cement ... | |
| final year project | 12/11/2009 |
| Q: i am a final year student, i need to choose a project of different and simple concept because i am ... A: You have not mentioned which aspects of civil engineering interest you most, but if this is in ... | |
| pile foundation | 12/10/2009 |
| Q: thanx alot for your previous answers , -if we have tower without basement , water level is -1.5m , ... A: Yes, in this case include tie-beams and place the fllor slab on grade. But remember that tie beams ... | |
| Section cuts-etabs | 12/9/2009 |
| Q: I have viewed the tutorial of section cuts in etabs.. also have looked in the help files and done a ... A: Yes, this part is covered in the help menu, as quoted below. These are left and right sides of the ... | |
| etabs modification factor | 12/8/2009 |
| Q: Thanx for the previous answers. If I analyse a building in etabs with the default modification ... A: No, it depends on which code you are designing to, and so you need to stick to the recommendations ... | |
| pile foundation | 12/8/2009 |
| Q: Could you PLZ give me your opinion if i can (use group of piles with cap under each column and add ... A: Yes, you can use pile caps and to help in waterproofing and also ease of construction, you can ... | |
| pile foundation | 12/8/2009 |
| Q: Could you PLZ give me your opinion if i can (use group of piles with cap under each column and add ... A: The choice between using a raft or pile caps and slab depends on many variables such as overall ... | |
| Section cuts-etabs | 12/7/2009 |
| Q: I have viewed the tutorial of section cuts in etabs.. also have looked in the help files and done a ... A: Aplogies for this late answer, but I have not used section cuts much myself and I agree with you ... | |
| Pour Strips/ Shrinkage strips | 12/7/2009 |
| Q: Greetings sir! Nice to see you on this site. I had one concern about pour strip or shrinkage strip ... A: In both cases, the pour strip should be at least as wide as the lap length of the rebar, and hence ... | |
| stair supporting beam construction | 12/7/2009 |
| Q: The question I had was on the procedure of the construction of the beam supporting the intermediate ... A: I principle your gut feeling is correct, but in practice the method I have mentioned is commonly ... | |
| retaining wall design ? | 12/7/2009 |
| Q: i am a civil engineering student in wales i have been asked a question on the design of a mass ... A: This forum discourages doing homework assignments, but I will of course give you some pointers. ... | |
| stair supporting beam construction | 12/6/2009 |
| Q: The question I had was on the procedure of the construction of the beam supporting the intermediate ... A: This is a perfectly acceptable sequence of construction. All you need to do is prepare the face of ... | |
| Soil Mechanics Projects | 12/5/2009 |
| Q: SIR I AM A FINAL YEAR CIVIL ENGINEERING STUDENT.I WANT TO DO A PROJECT RELATING TO SOIL .PLEASE CAN ... A: I am not an expert in this field, but relating to structures, you could look into: 1. Effect of ... | |
| Dynamic-Diaphragm Eccentricity | 12/4/2009 |
| Q: I hope that you are fine and keeping good. When i perform static analysis i define 4 type of ... A: Yes, that is correct, but also ensure you have the negative direction load combinations. As for ... | |
| Projected loads | 12/3/2009 |
| Q: I hope that you are keeping good. My question are regarding a stadium that i have to model and ... A: 1. Yes projected gravity load is correct. Also remember to add in the dynamic loading due to crowds, ... | |
| Cost estimate for a concrete water tank | 12/3/2009 |
| Q: The school at which I volunteer in Kathmandu has an opportunity to gain a financial grant. This will ... A: The dimensions now look fine. I have designed many such tanks and have never had to resort to using ... | |
| Shear wall weight in psf | 12/3/2009 |
| Q: I hope that you are fine and doing keep. I want to ask about calculating weight of beams and shear ... A: I don't know why you wish to work this out, but the only sensible way is to work out the total ... | |
| Cost estimate for a concrete water tank | 12/3/2009 |
| Q: The school at which I volunteer in Kathmandu has an opportunity to gain a financial grant. This will ... A: Firstly I would recommend that you review the geometry so as to minimise total surface area, hence ... | |
| Questions regarding civil engineering | 12/2/2009 |
| Q: How does your job include Geography? How are mapps used in your job? What special techniques or ... A: 1. For design of roads, canals, railways, bridges dams etc, one need a good idea of the geography, ... | |
| final year project | 12/2/2009 |
| Q: Good day. I am in my fourth year of civil engineering about to start working on a final yr project ... A: This is too complex a subject to go through this medium, but you can learn the basics of STAAD.Pro ... | |
| UBC Torsional Irregularity | 12/2/2009 |
| Q: I hope that you are fine and keeping well. I have a question regarding torsional irregularity ... ... A: From what I can make out by way of a quick review, your spreadsheet looks OK, and your ... | |
| model hollowcore slabs in etabs | 12/2/2009 |
| Q: pls let me know how to model hollowcore slabs in etabs A: Here are 2 ways you can do this: 1. Model slabs as Shell, with special one-way load distribution. ... | |
| knowledge about reinforcement and structure | 12/1/2009 |
| Q: asslam alaikum Sir, i m a civil engineer fresher in dubai and i have n upcoming interview for asst ... A: Best of luck in your interview. You can refer to BS 8110 for detailing rules amd also check these ... | |
| Ribbed Slab Cross-rib | 12/1/2009 |
| Q: .. i want to ask what is exactly the "cross rib" ? how it works ? and when we put it ?? but to ... A: Perhaps you have not understood what I meant. A ribbed slab comprises ribs at say 450 to 600mm ... | |
| Ribbed Slab Cross-rib | 12/1/2009 |
| Q: .. i want to ask what is exactly the "cross rib" ? how it works ? and when we put it ?? but to ... A: Yes, one cross-rib at mid-span of a ribbed slab helps to distribite concentrated loads that ... | |
| concrete technology | 11/30/2009 |
| Q: Hi Can U please tell me how can we reduce the heat of hydration of cement? A: By minimising the cement content or replacing some cement with pozzalana or fly ash. You can also ... | |
| concrete tehnology | 11/30/2009 |
| Q: Can U please tell me the advantages of gap-graded mix? A: With gap graded aggregate, you achieve the best density, durability and strength of a concrete mix ... | |
| hollow blocks | 11/25/2009 |
| Q: im building two floor building in Nairobi. the slab on top of the sitting room 6mx6m and want to use ... A: Yes, you can use hollow blocks (or clay pots) in between RC ribs to form a what is called ... | |
| design of footings | 11/24/2009 |
| Q: I have a bearing capacity of soil i want to construct two story building how i decide depth of ... A: These are very basic principals that you should study from a text book before attempting to design a ... | |
| Questions:Etabs Beam Design and UBC | 11/24/2009 |
| Q: I hope that you are fine and keeping good. I am using etabs for frame analaysis and design. My ... A: The reason you are getting different moments in the support beams is because you have modelled one ... | |
| reinforcement details when beam cross each other | 11/24/2009 |
| Q: four columns in rectangle say A,B,C,D The center to center distance A to B is 6m & B to c is 10m ... A: You have not indicated whether the beams terminate at A,B,C, and D or whether they are continuous. ... | |
| Main & Secondary beam sections | 11/23/2009 |
| Q: how i decide main beam & secondary beam in slab when their depth are same? A: Work out which one attracts more loading due to it position within the slab, and make that primary. ... | |
| Questions:Etabs Beam Design and UBC | 11/23/2009 |
| Q: I hope that you are fine and keeping good. I am using etabs for frame analaysis and design. My ... A: I think you must be changing all the slab modifiers- you should only reduce the m11, m12 and m22 ... | |
| Large Opening in Flat Slab | 11/22/2009 |
| Q: Is it possile to provide a cutting of 1200 mm dia in a flatslab for the purpose of spiral staircaase ... A: If the spacing is only 2.7m, then with a hole 1.2m diameter the slab stops behaving like a ... | |
| Large Opening in Flat Slab | 11/21/2009 |
| Q: Is it possile to provide a cutting of 1200 mm dia in a flatslab for the purpose of spiral staircaase ... A: You are not clear on whether this is in an existing slab or one that is being designed. In either ... | |
| core cutting test | 11/21/2009 |
| Q: what is the criteria for core cutting test.? on how many days test result this is recommended .? ... A: The strength gain after 28 days depends on several factors, including method and length of curing, ... | |
| core cutting test | 11/20/2009 |
| Q: what is the criteria for core cutting test.? on how many days test result this is recommended .? ... A: Yes, you can cut cores anytime after 7-14 days (so long as concrete is hard enough not to ... | |
| Temperature analysis in R.C.C. building | 11/17/2009 |
| Q: this is Ravi Shankar, please tell me that what are the process of Temperature analysis in ETABS ... A: If your building does not have very stiff columns or shear walls, then the temperature analysis may ... | |
| How to construct domes using etabs | 11/16/2009 |
| Q: Mr.Arshad Khan I am an undergraduate student and I have a project that includes the design of a ... A: The procedure is as I described in my answer above. In addition, you can visit the CSI website and ... | |
| Basement Walls, plinth beams | 11/15/2009 |
| Q: I hope that you are fine and keeping good. My questions are 1) We provide beams at plinth level all ... A: UBC makes the recommendation you have quoted as these members, when cracked, lead to higher ... | |
| Basement Walls, plinth beams | 11/14/2009 |
| Q: I hope that you are fine and keeping good. My questions are 1) We provide beams at plinth level all ... A: The effect of plinth beams on lateral stiffness/deflection depends a lot on the geometry (e.g. depth ... | |
| flat slab and flat plate | 11/14/2009 |
| Q: 1-What are the methods and applications of the flat slab and flat plate in Bahrain? 2- What are the ... A: Flat slabs in Bahrain are either plain RC or post-tensioned. The latter are more economical for ... | |
| Basement Walls, plinth beams | 11/14/2009 |
| Q: I hope that you are fine and keeping good. My questions are 1) We provide beams at plinth level all ... A: 1. If the plinth beams are contributing to lateral stiffness of the frames, then include them in the ... | |
| etabs wall design | 11/14/2009 |
| Q: How I will get the reinforcement for a wall after the analysis and design?thanking you. A: This procedure is a bit long to describe over this medium, but if you refer to the manuals provided ... | |
| Fireproofing of steel buildings | 11/13/2009 |
| Q: can u plz guide me that in which cases we make our building fireproof with reference to steel ... A: Fire ratings are determined in accordance with local authority regulations and so you need to refer ... | |
| Column Loading | 11/12/2009 |
| Q: while doing analysing a G+1 villa,I do not need major moment or shear transfer to a particular ... A: Changing the rebar distribution will make little difference. You can alter the load-paths by ... | |
| structural design | 11/11/2009 |
| Q: is it possible to provide a column of size 150x700 in a G+1 villa ? thanking you, A: Only if it is a very lightly loaded column (in fact this could be classified as an RC wall), and you ... | |
| Foundations in swamps | 11/10/2009 |
| Q: What type of Foundation would you choose to erect a water tower that is being placed on concrete ... A: A raft would be adviseable, as swamps can have soft ground, and the raft will spread the pressure ... | |
| Final Year project topics | 11/9/2009 |
| Q: ..could u suggest me some latest structural engg project topics... i m more interested in some ... A: This is such a wide subject- it could any of the following: 1. High strength concrete 2. ... | |
| In some portion of beam decreasing the effective Cover will effect the strength of beam? | 11/9/2009 |
| Q: Here in our project some portion of roof inverted beam has to chipped off to fix the purlins(Inorder ... A: If the portion of concrete you have chipped off is in the compression zone (e.g. mid-span of a ... | |
| Construction demolition | 11/8/2009 |
| Q: arshad could you give me some advice and procedures about the method of demolition apart of ... A: Without knowing the details it is difficult to advise, but basically for a hordy slab system that ... | |
| Final Year project in Kenya | 11/7/2009 |
| Q: I am final a year Civil Engineering student in Kenya, and am not sure which project I should choose ... A: Jambo Eick, This is not quite my area of expertise, but knowing the problems of urban cities in ... | |
| Etabs (Perimeter beam for flat plate) | 11/7/2009 |
| Q: I am now modeling a 5 Storey car building (flat plate system with perimeter beam). I notice that the ... A: Yes, what you assume is correct- if the slab is quite stiff in relation to the beam, then it will ... | |
| Supports under Raft(Etabs) | 11/7/2009 |
| Q: I hope that you are fine and keeping good ! I was reading an etabs design manual of Atkins and it ... A: If you have access to the Atkins Stroogle website, you will see the full arguments there for and ... | |
| civil engineer | 11/6/2009 |
| Q: what are some advantages and disadvantages of a civil engineer? A: I presume you enquire about a career in civil engineering? If so, the advantages are that you will ... | |
| stay plates | 11/5/2009 |
| Q: plz explain what are stay plates and how their spacing is decided ? regards thanks in advance A: These are stiffener plates either at the ends or along the lengths of I-beams, H-columns or ... | |
| ETABS questions | 11/5/2009 |
| Q: I want a pdf file of reinforced concrete building by using ETABS,i don't clear it's tutorial. A: Your query is not very clear to me. I presume you are looking for an input file (EDB file) for a RC ... | |
| ETABS Section Cuts | 11/4/2009 |
| Q: I defined the section cut by providing (x,y) coordinates. how can I view the section cut? thanking ... A: many of the questions you ask me about ETABS can be answered by simply going to the help menu, such ... | |
| structural design | 11/2/2009 |
| Q: 1.I would like to clarify.while I'm doing modelling in etabs,I'm not providing any kind of freedom ... A: 1. You can consider them fixed, but with property modifiers to simulate cracked sections for ... | |
| Assessing a new house | 11/2/2009 |
| Q: Good day sir, Please how do i assess a new house for soundness of Civil, structural, electrical, ... A: You really need to consult an estate agent/surveyor for a detailed list, but these websites should ... | |
| Relation between the thickness of a wall and its length | 11/2/2009 |
| Q: If I consider a dam that is 10 meters in height then the pressure at the bottom of the dam will be ... A: This depends on which type of dam wall you are designing- an arch dam or a gravity dam or a ... | |
| Anchoring in RCC | 10/31/2009 |
| Q: I have to anchor a roof truss in an existing RCC Beam.. (this is an issue it self ) So the problem ... A: There is no drawing attached, but in any case you should not just rely on an adhesive as that can ... | |
| Flat slab design of tall building | 10/30/2009 |
| Q: Refer to the question and your answer at ... A: Yes, your approach can work so long as you do not intend the slabs to be fully-fixed to the core ... | |
| cantilever slabs | 10/28/2009 |
| Q: Can you please tell me about cantilever slab. Like what are it's adnavtages, where to provide ... A: The main advantage is that you can have a column-free zone for movement and views below the slab. ... | |
| Horrizontal Stirrups for Beam Bracket | 10/28/2009 |
| Q: I am working as a Quantity surveyor over here in Abu Dhabi. I am confused with Horizontal Stirrups ... A: Horizontal stirrups are normally provided for brackets and corbels to resisit the tensile forces ... | |
| Point load on load bearing wall | 10/28/2009 |
| Q: |I have a 9 M by 9 M hall with only external load bearing wall. To divide the slab inside I have ... A: Yes, so long as the contact pressure does not exceed the capacity of the load-bearing blocks and ... | |
| structural design | 10/27/2009 |
| Q: thanx so much for your presence sir.I would like to get clarified on following 1.upto howmany floors ... A: 1. This depends on the slenderness and natutal frequency of the building as well as local codes. In ... | |
| structural eng | 10/15/2009 |
| Q: Sir, In R.C building demolition/renovation how can one demolish groundfloor columns to create a ... A: This is a complex and potentially dangerous proposition, as the only way you can do it safely is to ... | |
| Concrete tesing thesis | 10/11/2009 |
| Q: My name is Ernst and I'm a final year Civil Engineering student, I just received my thesis topic ... A: There is a lot of material available on the internet, if you google the subject (such as ... | |
| structural design | 10/10/2009 |
| Q: Is it possible to rotate a column (eg.500x200) to 90 deg. in the above floor from its position in ... A: This is a major change in size, as the only common area is 200X200, so I would say it will be ... | |
| solid slab shear | 10/9/2009 |
| Q: why solid slab have no stirrups A: This is mainly because shear in solid slabs is evenly distributed at the beam/wall supports and is ... | |
| Spring Stiffness & Subgrade Modulus | 10/8/2009 |
| Q: how can I convert soil bearing cappacity to area springs ? thanking you.... A: This is dependant on the soil type and its level of compaction. You normally get subgrade modulus ... | |
| Expansion joints in structures | 10/8/2009 |
| Q: when the length of structure(buildings) exceeds certain limit, then expansion joint is provided, ... A: If the foundations are good and you do not have any problems with differential settlement, then you ... | |
| Expansion joints in Water retaining structures | 10/5/2009 |
| Q: Sir, Do we need to insist expansion joints in walls or base slab for an RCC Ground water reservoir ... A: If the design takes care of all stresses caused due to temperature variations, and if you take care ... | |
| rcc slab | 10/4/2009 |
| Q: How should the slabs in multi-storey rcc frame structure( buildings of four to five storey) be ... A: If it is possible to provide continuity rebar across two adjacent slab panels, then that is the ... | |
| striuups | 10/4/2009 |
| Q: please explain me the difference of 4 legged,6 legged %26 8 legged stirrups with sketch must A: You can have 4, and 6-leg stirrups, but these are normally in wider beams, otherwise there would be ... | |
| senior project dissertation topic | 10/3/2009 |
| Q: this is last year in B.Sc Civil Engineering in Bahrain. I am looking for a nice topic for my senior ... A: Yes, you have the correct approach. For case studies, you could use the Bahrain WTC (with the wind ... | |
| senior project dissertation topic | 10/3/2009 |
| Q: this is last year in B.Sc Civil Engineering in Bahrain. I am looking for a nice topic for my senior ... A: I would recommend that you go for subject 3 (Green Building Costs) as that is very topical at the ... | |
| Moment magnification factor from ETABS | 10/2/2009 |
| Q: How can I get the value of moment magnification factor from ETABS? If I do P-delta analysis does it ... A: Yes, ETABS does calculate magnification factors and includes these in the output. This applies ... | |
| etaabs | 10/1/2009 |
| Q: While doing analysis in etaabs ,Is it better to consider analysis property modification factors for ... A: Visit this website and scroll up to section 10.11.1 and you will see all the factors. ... | |
| etaabs | 9/30/2009 |
| Q: While doing analysis in etaabs ,Is it better to consider analysis property modification factors for ... A: This depends what you are analysing for- in simple terms, if it is for wind loading, you can use 1, ... | |
| Spacings of expansion joints in Gulf Region | 9/28/2009 |
| Q: I was told that due to extreme variations in temperature in a day (night time and day time in 1 ... A: As far as I know, there are only guidelines, not strict requirements. However, some local ... | |
| Spacings of expansion joints in Gulf Region | 9/28/2009 |
| Q: I was told that due to extreme variations in temperature in a day (night time and day time in 1 ... A: The daily range is around 15-20 deg C, and the maximum recommended spacing of joints is around 50m. ... | |
| Inclined RCC columns | 9/26/2009 |
| Q: Due to architectural requirements I have requirement of providing an inclined column. can you please ... A: You have asked me this question before and I answered it on 16th March as follows: The main ... | |
| core wall design | 9/26/2009 |
| Q: What is the max.opening that can be provided in a corewall for the design of multistoried ... A: This depends on the aspect ratio of the opening in relation to the core wall, but in any case you ... | |
| Retaining Wall Cracks | 9/25/2009 |
| Q: sir i am doing project of building size 120.0mts*80.0mts .height of the slab is 4.50mt.the building ... A: Based on the limited info you have given, this sounds like an under-design of the retaining ... | |
| interview | 9/24/2009 |
| Q: Q: How much does a civil engineer get paid? Q: What is your job title? Q: Why did you decide to ... A: My job title is Director of Structures. The starting salary for a graduate in UK would be around GBP ... | |
| Wind & Seismic Loading | 9/23/2009 |
| Q: sir, Do we need to consider the earthquake load and wind load analysis for a G+6 building? how many ... A: Wind loading should be considered for all buildings, as depending on location/exposure, even single ... | |
| high school interview project | 9/23/2009 |
| Q: I need to interview a civil engineer for my high school class, because it might be a field of work ... A: These are far too many questions for me to answer in detail, but I have been asked similar questions ... | |
| Cantilever / Supported Balcony Loads, Moments & Forces | 9/17/2009 |
| Q: I am currently studying for a distance learning HND in construction and am having serious headaches ... A: This is quite an involved question, but you can break it down into steps and do the following: 1. ... | |
| box culvert | 9/17/2009 |
| Q: i am trying to analysis the twin box culvert that is subjected to wheel loads.I want to know how to ... A: This is normally designed on basis of an influence line (moving loads, like for bridges), but you ... | |
| Building High-rise | 9/16/2009 |
| Q: how we build a multi storied building A: This is a complex subject but you will get some guidance from this website: ... | |
| scope in civil engg. | 9/16/2009 |
| Q: i'm doing my b.tech civil engg. 1st sem. from tezpur univ.i am not sure about it's ... A: Without knowing the local market, I would say that if you enjoy your subjects, then stick with the ... | |
| Concrete strength | 9/15/2009 |
| Q: Salams, Is there any methods to increase the strength of the concrete after concrete is poured. ... A: If it is freshly poured, then good curing methods can ensure that you get the best possible ... | |
| concrete | 9/10/2009 |
| Q: Arshad Khan recently we have a serious problem in executing of pedestals which is creating bubbles ... A: Yes, this can be a serious problem especially if the pedestals have rebar embebbed, which can ... | |
| Rebar Cranking | 9/10/2009 |
| Q: "The starter bar location for column was out of alignment about 30 - 40mm, then cranking of rebar is ... A: The slope is independant of diameter of bar, as it is the resultant horizontal component of ... | |
| moment | 9/9/2009 |
| Q: i am trying to figure out what a moment from an engineering stand point is and can u plz give me 3 ... A: A moment is the internal coupling force (or stress) created within a member due to external loading. ... | |
| Combined Footing | 9/9/2009 |
| Q: I am designing a foundation made up of a four beams connected together. size of beams 6.85m x 0.85m ... A: You need to obtain the modulus of sub-grade reaction and use this to form the spring-stiffnesses for ... | |
| about final year project | 9/1/2009 |
| Q: I m a student of B.E.(civil) from latur and I need your help for my final year project topics ... A: If you are seeking ideas for topics, then here are a few: 1. High strength concrete 2. Sustainable ... | |
| civil engineering | 9/1/2009 |
| Q: Sir, please simply tell me the difference of Deep ruled pointing, Tuck pointing and Flush Pointing A: I am not an expert in blockwork, but from what I can make out, these are terms for how one finishes ... | |
| footing | 8/31/2009 |
| Q: I am designing a footing whick looks like an inverted L-shape. what is the way of designing such a ... A: Assuming that the ground at the inside corner of the L remains intact and that the vertical drop of ... | |
| windmills | 8/31/2009 |
| Q: I am trying to make a windmill. Please look at my sketch. Can you think of an answer to my two ... A: This is not quite my area of expertise, but having looked at your sketch, the answers are: 1. Yes, ... | |
| stirrups shape | 8/31/2009 |
| Q: i am working as a consultant engineer.we are following the stirrups (shear links)ends should bent ... A: The 45 degree bend is a requirement for structural ductility detailing for seismic zones. As the old ... | |
| the effect of cantilever in dynamic analyzing | 7/18/2009 |
| Q: in my project there is along cantilever so when i analyzed the model usin dynamic anlyzing i noticed ... A: It seems that your cantilever is actually a slab varying in span. If the maximum span is 4m and the ... | |
| RCC footing | 7/7/2009 |
| Q: i have to design isolated footings of columns which are 10mm apart from each other because of ... A: In this case, you should not take the joint through the footing- in fact you can stop the movement ... | |
| structural design | 7/6/2009 |
| Q: Could you advise a site that which describes the manual analysing and design of posttensioned slabs ... A: Please study this book- it will answer 95% of the questions you have been asking me about RCC and ... | |
| diagonal reinforcement | 7/6/2009 |
| Q: Could you please advice what is the importance of the diagonal reinforcement in the outside corners ... A: This depends on the size of the opening in relation to the span of the slab and also on the location ... | |
| SAP2000 & ETABS | 7/5/2009 |
| Q: Which types of structures preferable to do in SAAP rather than Etaabs.Can I analyse and design ... A: Firstly, these software are called SAP2000 and ETABS and you get full details of their capabilities ... | |
| Actual detail of connections | 7/4/2009 |
| Q: good day sir! I'm a new civil engineer, just want to ask the actual structural details of fixed, ... A: If the rebar from column is bent over and has full anchorage into the beam, then that can be ... | |
| structural design | 7/4/2009 |
| Q: While designing underground water tanks,Is it preferable to do in SAAP as etaabs cannot do that ... A: That is simple- depending on the number of wall elements for the height, just do manual calculations ... | |
| Punching | 7/2/2009 |
| Q: I have 2 opening adjacent to a column in flat slab. Please advice how to check the Punching safety. ... A: That depends on the width of the openings compared to the width of the column. If the latter is ... | |
| Pad Foundation design | 7/1/2009 |
| Q: I am designing a pipe bridge across a river. I need to calculate the area of the footing for the Pad ... A: The 1:600 slope is insignificant. Moments will be incurred orthogonal to the axis of the pipe, as I ... | |
| Design for Thermal Stressess | 7/1/2009 |
| Q: Arshad, Thanks for your reply of my first query in this forum regarding braced & unbraced columns. ... A: If there is no chance of bracing the column (or any part of the building), then you can cast on the ... | |
| Pad Foundation design | 6/30/2009 |
| Q: I am designing a pipe bridge across a river. I need to calculate the area of the footing for the Pad ... A: Assuming that the pipe is straight, without any bends near the pad footings, then you do not need to ... | |
| 40' Tall Retaining Wall | 6/29/2009 |
| Q: . This is an emergency.. can you please tell me how to design a 40' high cantilever retaining wall.. ... A: Without knowing details of what you are retaining (properties of soil, ground water level, ... | |
| Braced & Unbraced Column in RCC Structure | 6/29/2009 |
| Q: Mr. Arshad, Pleas see below my query: If a 400x400 RCC column is connected to 350x600 deep beams ... A: 1. Yes, it can be considered braced against rotation, but not sway unless the whole building is ... | |
| Spring Stiffness & Subgrade Modulus | 6/28/2009 |
| Q: what is the relation between spring stiffness and subgrade modulus?thanking you.. A: Assuming your units are the same, then subgrade modulus per m2 can be converted to spring stiffness ... | |
| Container Design | 6/27/2009 |
| Q: I hope that you are fine. I have to design a container that has to be used as an office. but i dont ... A: If you are talking about a standard shipping container, then that is strong enough to act as an ... | |
| Vierendeel truss | 6/25/2009 |
| Q: Regarding Vierendeel trusses, are the chords and braces typically constructed with the exact same ... A: Not necessarily, but they may be due to ease of making the connections. The welds should be full ... | |
| safe | 6/25/2009 |
| Q: Thanx so much as my colleague already asked the question that I have sent before and I got ... A: I can tell from your question that you do not understand the basic principles of flat slab analysis ... | |
| Structural Beam | 6/24/2009 |
| Q: ..My name is Zairul..how is the better way to joint the new concrete stump(using for membrane ... A: As membrane structures have high tension forces, you have 2 options: 1. Use one or a pair of steel ... | |
| SAFE Deflections | 6/23/2009 |
| Q: Sir, In the elastic deformed shape got from safe after analysing a slab, the values are ( max.0.000 ... A: This depends on the span and the amount of rebar that you have detailed. Deflection itself is not an ... | |
| slab failure | 6/23/2009 |
| Q: What may be the causes for the failure of 2way rcc slab?, slab is fallen down and cracks are also ... A: This could be due to several reasons or combination of reasons, such as: 1. Insufficient thickness ... | |
| RCC slab & beam depths | 6/22/2009 |
| Q: what should be the thickness of a slab beam of a one floor house. A: You have not given enough details to advise properly, but as a rule of thumb, any simply-supported ... | |
| SAFE Analysis | 6/22/2009 |
| Q: while doing slab design in safe,which kind of analyzing that I should choose normal,normal cracked ... A: In most cases normal is fine. Cracked is used where you have long spans/shallow slabs and deflection ... | |
| RCC Column/Beam Joint Rebar Detailing | 6/22/2009 |
| Q: In RCC space frameS, the Beam-Column joint at the discontinuous end; if we provide hooks using the ... A: Based on the detailing in the picture, the joint will not be fully-fixed, nor a full hinge- it will ... | |
| Geotechnical | 6/19/2009 |
| Q: Sir, I am a graduate in Civil Engineering and working as a design Consultant in Power industry.Now ... A: The decision really depends on what interests you more- statics and analysis (and seeing actaul ... | |
| expasion joint | 6/18/2009 |
| Q: is any expansion joint or construction joint required in a RCC flat slab, span about 62m X 100m for ... A: Yes, you should have at least on expansion joint to break the 100m into 50m. If no expansion joint ... | |
| RCC beam load Capacity | 6/18/2009 |
| Q: Sir, there are 2 Coloums of size 9" by 12" which are 17 ft apart and there is a RCC Beam of size 9" ... A: I order to determine that, you need to know the class of concrete and the amount of main and shear ... | |
| Precast and Pretensioned slabs | 6/17/2009 |
| Q: Could you advise me the principle for the precaste slab? Is it same as the pretensioned slab? what ... A: Precast slabs mean that they are made in factories or on site in relatively small sections that can ... | |
| General SBC in Tanzania regions | 6/17/2009 |
| Q: What is the General Soil Bearing Capacity in Tanzania regions A: That depends on location, as it can vary from 100 kN/m2 to 400 kN/m2 in soils, and even up to ... | |
| About Stirrups | 6/16/2009 |
| Q: Sir I am working as a quantity surveyor in Muscat.Now I have one doubt about stirrups. When I am ... A: You can have 4-leg and 6-leg stirrups, but these are normally in wider beams, otherwise there would ... | |
| ETABS Energy Work Diagrams | 6/16/2009 |
| Q: Could you give me an idea regarding relative work/volume diagram from etaabs model?what is this ... A: This is not normally to do with stability but with deflection control and is a way of look at the ... | |
| cranking of rebars | 6/16/2009 |
| Q: What is the tolerance for rebar cranking if my starter bars for columns or RC wall are found out of ... A: This depends partly on how stressed the compression rebar is during service- the higher the stress ... | |
| etaabs | 6/15/2009 |
| Q: while supporting a beam on a cantilever portion whether we need to release the end joint of the beam ... A: This depends on the relative sizes and spans and loading on both the cantilever and the secondary ... | |
| Atterberg Limits and Foundation Design | 6/14/2009 |
| Q: Do Atterberg limits have any impact on foundation design? If so, what are the parameters to be ... A: Yes, they do, particularly for pile design. Please see the website below for a detailed explanation: ... | |
| Civil Engineer | 6/14/2009 |
| Q: Sir a 120 year old stone building have a problem of dampness.dampness is raising 8ft on wall.what is ... A: The most probably reason for dampness is either that the original damp-proof course (DPC) has ... | |
| Extension to exsisting structure | 6/14/2009 |
| Q: I have a G+1 building 10years old with an open terrace they want to extend and use the terrace.Hence ... A: You have not given enough info to advise properly, but basically you need to assess if the ... | |
| need ur advise regarding civil engineering | 6/13/2009 |
| Q: Respected sir my name is zeeshan saeed i have done my civil engineering in 2005 from pakistan then ... A: I would suggest that either you go for a refresher course at your local University, or else look for ... | |
| Foundation Depth | 6/13/2009 |
| Q: in filled areas where the soil is viberated and 600mm compacted highly what will be the depth of ... A: This depends on the bearing capacity compared with applied pressure, but generally you need to be ... | |
| Prestressed Concrete | 6/13/2009 |
| Q: 1.How we can design a post tensioned slab .what are the criteria in design to be followed? 2.is it ... A: Post-tensioning is simply to apply pre-stress after casting & curing concrete, and prestressed ... | |
| Concrete flat plate | 6/12/2009 |
| Q: Given: A flat plate slab of 25 cm thick ,fc 30 mpa span ,clear span 690 cm ,both direction,supported ... A: This depends on the number and location of columns- if it is just one column at the centre and the ... | |
| safe | 6/8/2009 |
| Q: while designing slab in safe (exporting from etaabs) while seing the punching shear its always ... A: Without seeing the model it is difficult for me to advise, but if you are concerned about any ... | |
| designing a beamm | 6/6/2009 |
| Q: how to design a beam abd how we know if the beam is the most critical beam A: You work out the loading on the beam and then from that the internal forces (bending moments, shear, ... | |
| structural design | 6/6/2009 |
| Q: 1.In safe while designing raft slab Is any provision for entering soil bearing capacity rather than ... A: 1. No, because the capacity has no relationship to soil stiffness as far as SAFE is concerned. 2. ... | |
| Class 40 concrete | 6/4/2009 |
| Q: what is the ratio and strength of class 40 concrete. Also which are the areas or under what ... A: This depends on the type of aggregate and cement and additives, but the following website will give ... | |
| HELICAL STAIR CASE | 6/3/2009 |
| Q: i have a helical stair case with 176^ total angle subtended by the helix the internal diameter of ... A: Just design the section of stair that is in contact with the first floor slab as a wide beam, with ... | |
| Design of Pile Cap as Pier Cap | 6/3/2009 |
| Q: we are in the process of designing a at the grade bridge over a water body. In this case we are ... A: I cannot do actual designs for you but just give advice. I would say that in principle there is no ... | |
| doubts regarding plinth beams | 6/3/2009 |
| Q: Mr. Arshad khan Asslamalaikum I am constructing a house in India and construction is going on I am ... A: In principe plinth (or tie) beams between pads are only required if: 1. You expect differential ... | |
| Beam design | 5/13/2009 |
| Q: Please, I want to know whether the position of the slab affects the effective depth. i.e. is the ... A: The effective depth of a beam is increased if the slab is in the compression side of the beam, when ... | |
| RC Cantilevers | 5/13/2009 |
| Q: 1.what is the max span of a cantilever beam that can be designed?is any limitation regarding this ... A: 1. You can design any span, so long as you take care of long term deflections- so the span/depth ... | |
| RCC design | 5/13/2009 |
| Q: i wants to know building design ,RCC structur design like foundation base, columns, slab etc. with ... A: This is a complex subject which you will need to learn by instruction or self-study. These sites ... | |
| Column Structure & design | 5/12/2009 |
| Q: From what depth should I start my columns for a three storey building.L=40" B=12" H=34" in Surat ... A: Water depth is not a major criteria, but the ground conditions is what determines depth- so, without ... | |
| Flat Slab | 5/12/2009 |
| Q: Due to restricted hieght, I am asked to Design a Flat slab System. I have never designed it ... A: This is complicated if you do not have a regular grid of supports and the only way is to use a 3-D ... | |
| Column Structure & design | 5/11/2009 |
| Q: From what depth should I start my columns for a three storey building.L=40" B=12" H=34" in Surat ... A: I presume your dimensions are in feet and not inches (")? Anway, the depth of foundation is ... | |
| civil engineering | 5/10/2009 |
| Q: which type of foundation should be preferred in ordinary houses? A: That depends on the ground conditions. If the ground is weak or likely to result in uneven ... | |
| honeycombs in concrete | 5/8/2009 |
| Q: we are doing post tensioning for a slab.After concreting the slab we realise there are honeycombs at ... A: You can repair this by ensuring all loose aggregate is removed and then using a bonding agent such ... | |
| designe bridge of pipe rack | 5/6/2009 |
| Q: I have problem that seems you can help me to solve . I want to design bridges for pipe rack.But i do ... A: I am not sure I understand your question too well, but for wind loading on an open lattice structure ... | |
| cracks in concrete | 5/6/2009 |
| Q: Can you advise me ,for the remedial measures if cracks are seen in RCC structures and the bars are ... A: What you need to do is remove the concrete cover and expose the corroded rebar. Remove all loose ... | |
| deflection results in staadpro | 5/6/2009 |
| Q: do i have to check global or local deflection for the members. please help! ANSWER: Hi Anees, ... A: In your case, the overall deflection of the slabs is a critical servicibility criterion (for example ... | |
| deflection results in staadpro | 5/6/2009 |
| Q: do i have to check global or local deflection for the members. please help! A: This depends on the nature of the structure and what you are trying to check. For example, for a ... | |
| raft footing | 5/2/2009 |
| Q: my question is that what parameter are used to design the thickness of the raft footing and what is ... A: A raft foundation is designed like an upside-down flat slab, with the upwards subgrade reactions ... | |
| clear-span load capacity | 4/30/2009 |
| Q: Mr. Khan, I am the owner of an older home which has had several upgrades performed over the years. I ... A: What you are proposing is feasible, but you will really need a local structural engineer to study ... | |
| splices in rolled steel sections | 4/30/2009 |
| Q: i have a steel H beam around 600mm deep spanning more than 12m, which is the normally available ... A: There are two common ways of splicing: 1. Welding, using full penetration butt welds. 2. Bolting- ... | |
| Combined foundation | 4/27/2009 |
| Q: I am trying to design a combined footing (slab and 2 plinths). how do I find the centre of gravity ... A: Yes, that is a simple case of using first principles by taking moments about the edge of the base ... | |
| Structural Steel Connections | 4/25/2009 |
| Q: I want to know the detailing we do for steel to steel connection in Steel Buildings and sheds, and ... A: Visit these sites and you will have a lot of useful links/images: ... | |
| Combined foundation | 4/24/2009 |
| Q: I am trying to design a combined footing (slab and 2 plinths). how do I find the centre of gravity ... A: I don't know if you got the signs right- are you saying that 400kN is downwards and 200 kN is ... | |
| Tutorial on foundation design | 4/23/2009 |
| Q: I am looking for tutorial lessons regarding foundation design. I was not able to practice for a long ... A: It is admirable that you wish to learn the basics rather than blindly use software. I regret to say, ... | |
| Project | 4/22/2009 |
| Q: Name a few projects you've worked on and what role did you play in the project? A: These are some of the projects: 1. Textile Mill in Tanzania- lead structural engineer 2. Water ... | |
| Cylinder and Cube Strengths | 4/14/2009 |
| Q: what is the relation between test results are obtained from cylindrical specimen & rect angular ... A: You need to be careful as to which codes the concrete is referring to. If it is to the old codes, ... | |
| Cylinder and Cube Strengths | 4/13/2009 |
| Q: what is the relation between test results are obtained from cylindrical specimen & rect angular ... A: Generally a cylinder test strength is between 5% and 25% less than a cube test strength for a given ... | |
| Notional Loads | 4/13/2009 |
| Q: in AISC05 ASD and LRFD, when adding the notional loads to the structure, the code states to add the ... A: This is not a code I am familiar with, but from what I can make out, notional loads need to be ... | |
| etaabs | 4/12/2009 |
| Q: Can we do eccentric connection between column and beam in etaabs? thanx so much. A: The answers to many of the questions you are asking me on ETABS are readily available in the help ... | |
| Modelling Base Fixity Conditions | 4/12/2009 |
| Q: which would be the better way of assumption for the support conditon while modelling either pinned ... A: This depends on a few variables- whether it is high-rise (in this case either is fine as it makes ... | |
| etaabs | 4/11/2009 |
| Q: while doing auto mesh in slab in etaabs I'm getting a warning like 'check ... A: Ravi, It is diffucult to comment without seeing the model. I suggest you send it to support at CSI ... | |
| structural details | 4/11/2009 |
| Q: i need to construct a building 25 feet wide, 45 feet long & 15 feet clear height inside, no columns ... A: You have not given me enough info to advise you- for example, will the building be in RC or steel, ... | |
| Rebar Sizes Etabs | 4/9/2009 |
| Q: . I hope that you are keeping welll. My question is that we can define/edit rebar sizes in etabs.. ... A: This is from the ETABS help menu: Reinforcement Bar Sizes Form: Reinforcing Bar Sizes Define the ... | |
| etaabs | 4/8/2009 |
| Q: thanx so much for your valuable support always.In Etaabs 1.whether we need 2 add ground floor slab ... A: 1. If the ground slabs are ground-bearing, rather than suspended, then there is no need to model ... | |
| Rebar Sizes Etabs | 4/8/2009 |
| Q: . I hope that you are keeping welll. My question is that we can define/edit rebar sizes in etabs.. ... A: This feature is there because ETABS may not allocate the best size/distribution of rebar that is ... | |
| Rcc Design | 4/7/2009 |
| Q: Salam I am M. Zeesha From Pakistan DAE Civil Quantity Surveyor "What is the logic of Extra Bars at ... A: This is because the bending moment diagram is such that you will have maximum tension at the bottom ... | |
| window cleaning equipment of roof slabs | 4/7/2009 |
| Q: precast people refused to design slabs to accommodate for the window cleaning equipment load ... A: In this case you need to design the slab to carry patch loads (under footprint of the pad), and you ... | |
| Openings in RC beams | 4/6/2009 |
| Q: i have 1000 mm x 300 mm beam (10 meter long) in first floor in 35 story building. This is well ... A: This depends on whether you have any concentrated loads- if it is mainly UDL, then the safest place ... | |
| Stepped foundation | 4/6/2009 |
| Q: we have a steep road that in top and the bottom of it are single footing,what is your opinion for ... A: You have not given me enough information, but in principle such a foundation should be done in a ... | |
| Steel Structures | 4/6/2009 |
| Q: 1.Can you please tell me why we use Stiffner plates apart from the apparent meaning how can I decide ... A: 1. This website has all the info you need: http://euler9.tripod.com/bolt-database/22.html 2. ... | |
| Column Lateral Ties Design | 4/6/2009 |
| Q: Arshad, Actually i m working on the industrial project, so i always come acroos big columns. So i ... A: You cannot cut corners in this regards, as the ties are not there for shear, but mainly as restaints ... | |
| Diaphragm shear transfer in concrete slabs | 4/5/2009 |
| Q: Once again, thank you so much for your reply (May 20, 2008). However, I would like to add to my ... A: Firstly the shear that the diaphragm resists is the difference between the storey shear that the ... | |
| Cutting reinforcement by flame | 4/4/2009 |
| Q: Could you please advice which part in B.S stats that Cutting reinforcement by flam is not acceptable ... A: Ho Wow, I do not think there is a BS restriction, but visit this site and you see lots of debate on ... | |
| Steel Structures | 4/4/2009 |
| Q: 1.Can you please tell me why we use Stiffner plates apart from the apparent meaning how can I decide ... A: 1. It's mainly to get good bond for both top and bottom rebar and to prevent cracks. For inclined ... | |
| Steel Structures | 4/4/2009 |
| Q: 1.Can you please tell me why we use Stiffner plates apart from the apparent meaning how can I decide ... A: 1. These are usually needed to distribute the loading more evenly or to prevent local buckling of a ... | |
| Civil Engineering questions | 4/2/2009 |
| Q: my name is Alex Gonzalez, i'm a sophomore at California High School. We are having to do a career ... A: Answer: Hi Alex, My job title is Director of Structures. The starting salary for a graduate in UK ... | |
| ground slab capacity | 3/31/2009 |
| Q: On existing 20cm ground floor slab with y8@20c/c steel mesh a 90 ton machine 3.5x5.0m base ... A: If the ground is very well compacted so that it does not settle with a pressure of 50 kN/m2, then ... | |
| window cleaning equipment of roof slabs | 3/31/2009 |
| Q: precast people refused to design slabs to accommodate for the window cleaning equipment load ... A: You need to treat this like a moving load for bridge design- presumably the wheels will be running ... | |
| Construction enginnering | 3/30/2009 |
| Q: what is a basic job that someone that is a constuctional engineer does. Like do they get designs ... A: Yes, that is what a structural engineer does- i.e. work with architects to design the most efficient ... | |
| Project topics | 3/30/2009 |
| Q: Please kindly assist me with some project topics relating to Qality control of civil engineering ... A: Here are some suggestions: 1. Setting out accuracy (line and level)for say roads and bridges 2. ... | |
| Silo Foundation | 3/28/2009 |
| Q: I want suitable foundation type for 5 silos of diameter 25m which are constructing in one line. Soil ... A: This would be considered a structural slab on grade, and the design needs to take account of the ... | |
| Silo Foundation | 3/28/2009 |
| Q: I want suitable foundation type for 5 silos of diameter 25m which are constructing in one line. Soil ... A: That's a good point, but this really depends on what the safe bearing capacity of the soil is and ... | |
| i want to set a designing consultancy | 3/25/2009 |
| Q: Sir I am civil engineer master degree graduate. I have command in my subject but no experience . ... A: I am sorry but I have no experience or knowledge of requiremnets for setting up a consultancy in AP ... | |
| Energy Work Diagram | 3/24/2009 |
| Q: Can you explain the use of Energy work diagram in etabs Thank you A: These basically tell you how hard each member is working (utilisation ratio), so that you can ... | |
| Isolated eccentric footing | 3/23/2009 |
| Q: How to design a isolated footing where the column exactly comes on the boundary(no offset). Should ... A: Yes, this is a common problem and you need to design it as an eccentrically loaded pad footing, ... | |
| Boundary Wall Joints | 3/19/2009 |
| Q: I have a boundary wall composed of reinforced concrete column with ground beams and foundation,the ... A: Your question is not very clear, as it could be read in two ways: 1. If you want to know how often ... | |
| job and spring constant value | 3/17/2009 |
| Q: SIR I AM CIVIL ENGINEER.IHV PROB. TO UNDERSTAND SPRING CONSTANT VALUE OF BOTTOM SLAB OF BOX ... A: 1. For modulus of subgrade reaction (spring constant), refer to my answer in website below: ... | |
| Concept of Unit width Design | 3/17/2009 |
| Q: we have multiple cell reinforced concrete box section(tunnel) containing a huge fill of varying ... A: One way to check this would be to take the loadings for 2 different unit widths, say 4 or 5m apart ... | |
| Inclined Columns | 3/16/2009 |
| Q: I have generally designed columns which are vertical in RCC Buildings..Now I got a Traditional ... A: The main secondary effect of having inclined columns is that they introduce a horizontal component ... | |
| Column Design - Etabs | 3/12/2009 |
| Q: If we design column using etabs it shows overstressed while at the same time if we cross checked ... A: In that case, the only reason I can imagine for the different results is that maybe you got the ... | |
| mezzanine reinforcement | 3/11/2009 |
| Q: Khan, I am designing a wooden slab mezzanine which is 4.4m in length and 2.3m wide and to be used ... A: This is a bit difficult to visualise, but if you are spanning the timber decking (not slab) in the ... | |
| Overhead Steel Water Tank | 3/11/2009 |
| Q: I need to determine the minimum allowable wall thickness for the shell and end covers of a ... A: I regret that I do not carry out actual designs, for liability reasons-I just give advice. The best ... | |
| Seismic joint & .... | 3/8/2009 |
| Q: Many thanks for your reply 1. In my previous question, I should better say seismic joint, instead of ... A: 1. Noted 2. This depends on where your main shear/core walls are. You should try and put joints at ... | |
| expansion joint | 3/7/2009 |
| Q: we are designing g+15 storey structure, the length of the structure is 119m, so expansion joints ... A: Firstly, the 40-50m normal joint spacing can be increased to 75m and even 100m, if a proper thermal ... | |
| Final year project topics | 2/26/2009 |
| Q: I'm a final year student in Structural engineering. I'm interested in doing my project in ... A: This is such a wide subject- it could be on concrete mix design or durability or strength gain, or ... | |
| Civil Engineering | 2/25/2009 |
| Q: Sir. Briefly answers my few questions. (Emergency, I need to reply to my boss today. Thanks so ... A: Basically the laps should be about rebar diameter x 40, but these can increase if the bars are ... | |
| Existing ground slab capacity | 2/23/2009 |
| Q: There is a existing Ground slab, 150 mm tk. rfd with 8mm@150mm c/c bars(single mat).Now i want to ... A: Without knowing the ground conditions, it is difficult to advise you. However, based on my ... | |
| Civil | 2/22/2009 |
| Q: I am QC inspector. I want to prepare a presentation. I need some tips for that. Can you please tell ... A: Briefly, here are my answers: 1. This can cause cracking due to shrinkage and also "surface ... | |
| Pilecap Design | 2/21/2009 |
| Q: What are the things that I should look into to design a pilecap for 14 no of piles, how do I take ... A: Try this site for a spreadsheet: http://www.structural-engineering.fsnet.co.uk/cid.htm and also ... | |
| STAAD foundations | 2/20/2009 |
| Q: I'm design a four-storey structure with staad. I want to know if it is possible for staad to ... A: I have not used STAAD for a while, but the last version did not have this facility. The only way was ... | |
| Pilecap Design | 2/20/2009 |
| Q: What are the things that I should look into to design a pilecap for 14 no of piles, how do I take ... A: That is similar to designing a piled raft, which is quite complex to analyse- you will need to do a ... | |
| Expansion joint in tall building | 2/19/2009 |
| Q: I design a 30 stories building & because of the Codes we should put expansion joint in every 50 ... A: Firstly, the 50m can be increased to 75m and even 100m, if a proper thermal analysis is done and the ... | |
| Slab vibration | 2/18/2009 |
| Q: The following is a real case that occurred on a particular residential building site. A slab 6.0m by ... A: The short answer is that the assessment was flawed, as in order to limit deflection/vibration ... | |
| Swing Bridge with electric trolley car access | 2/16/2009 |
| Q: My ancestors were from Libau, Latvia. Around the turn of the century a Swing Bridge was used that ... A: Not knowing the details, these are the possibilities: 1. The overhead cables were high enough to ... | |
| water proofing under raft in gulf | 2/15/2009 |
| Q: Please provide detail water proofing procedure and also explain raft reinforcement details for high ... A: There are many systems available in the Gulf, such as Sika or Servicised or Fosroc- you should ... | |
| resizing overhead RC tank | 2/14/2009 |
| Q: I am from central Myanmar. We have an overhead RC tank in our islamic school, from which we ... A: You have 2 options: 1. If there is enough pressure in the mains supply, then build another tank ... | |
| resizing overhead RC tank | 2/14/2009 |
| Q: I am from central Myanmar. We have an overhead RC tank in our islamic school, from which we ... A: Without having details of the RC tank (wall thicknesses, rebar, etc) and about the ... | |
| BOX CULVERT DESIGN | 2/12/2009 |
| Q: How can I deign a box culvert with one cell, two cells or three cell? How to calculate the different ... A: Please check out these sites as they will give you all the info you need: ... | |
| Subgarde Reaction in safe | 2/12/2009 |
| Q: I want to know that If there is a relationship between modulus of subgrade reaction and bearing ... A: I am afraid it is not as simple as that, becuase you need to take into account the load-settlement ... | |
| Wind Loads Uganda | 2/10/2009 |
| Q: Arshad Khan My name is Andrea Viteri and I am currently working on a project with Engineers without ... A: This really depends on location within Uganda, but in anycase I do not have the info to hand. In ... | |
| Questions about your Career | 2/9/2009 |
| Q: Khan my name is Simon and i am conducting on research project on civil engineering. i am writing to ... A: My job title is Director of Structures. The starting salary for a graduate in UK would be around GBP ... | |
| Questions about structural engineering | 2/8/2009 |
| Q: I'm doing a research project in school about Civil and Structural engineering and was hoping you ... A: My job title is Director of Structures. The starting salary for a graduate in UK would be around GBP ... | |
| Civil Engineering | 2/8/2009 |
| Q: Sir can you please tell me how can one calculate the loads on a beam when its dimensions and area of ... A: Your sizes of bars are nor clear and I presume the beam is 72 inches long, but is it 9 inches wide ... | |
| florring | 2/2/2009 |
| Q: Which type of florring will cost cheaper. I want to renovate an old building which is almost 40 year ... A: This is difficult to assess as it depends on the local market in terms of materials costs, etc. As a ... | |
| Questions regarding ETABS | 1/7/2009 |
| Q: I want to ask the following questions regarding ETABS. What property shall I assign to Slab Objects ... A: Membranes have only in-plane stiffness (so can be used to simulate diaphragms), plates have ... | |
| Structural Design | 1/5/2009 |
| Q: I would like to know what is the formula for calculating Lap length and Anchorage as per the BS ... A: Lap lengths depend on a lot of variables, such as bundling, distance from edges, whether they are in ... | |
| Civil Engineering | 1/3/2009 |
| Q: How can we extend the existing foundation? or in other words How can we connect the existing ... A: The best way to do this is to hack back the side of the existing foundation to about 50mm beyond the ... | |
| foundation | 1/2/2009 |
| Q: I have a foundation of an existing 4x10 meters with isolated footing and reinforced concrete grade ... A: If you are connecting the foundations, then it would be better to also connect the rest of the ... | |
| building construction | 12/29/2008 |
| Q: what is the defference between a pad and raft foundation A: The main difference is in proportions and how many applied loading points there are. A pad is ... | |
| Foundation Design | 12/28/2008 |
| Q: I am doing my 1st year B.Sc Architectural Engineering, and for my geo-technical assignment, using an ... A: The following websites give you step-by-step procedure for designing a strip footing: ... | |
| Main rebar of column cutted | 12/23/2008 |
| Q: the main bar for the column of 4th floor (last floor) cutted by MEP people, please give me the ... A: Nadeem, My earlier answer still applies- you need to do a stress check to see if the cut rebar is ... | |
| basement waterproofing | 12/23/2008 |
| Q: One basement 10 meters beneath the ground level is being done. The raft thickness is .75 meters . ... A: This problem has arisen possibly because proper de-watering system was not installed? Also, I would ... | |
| Main rebar of column cutted | 12/23/2008 |
| Q: the main bar for the column of 4th floor (last floor) cutted by MEP people, please give me the ... A: You have not given me enough info to advise properly, but if the bar is critical to the structural ... | |
| lift well design | 12/21/2008 |
| Q: I am student of final year construction technology. I am designing a lift well 1.8 m x 2.1 m. I want ... A: In simple terms, work out the total vertical loading (W)on the total liftshaft (from beams/slabs ... | |
| Volunteer civil engineering wok | 12/20/2008 |
| Q: I have just finished with my B.E civil engineering and now I wish to gain experience. I have a full ... A: That is very pro-active of you and commendable. Much as I would like to be your mentor, my current ... | |
| RCC | 12/19/2008 |
| Q: Asalam-o-Alaikum, I want to know the possible solution for the following : A remarkable gap has been ... A: You have not given sufficient information for me to form an opinion and isn any case such cases ... | |
| GROUND BEAMS & GRADE SLABS | 12/19/2008 |
| Q: how to design a beam ans a slab resting on the ground or back filled soil? Do i have to make a staad ... A: Ahmed, This is complex soil-structure interaction problem and depends on the stiffness of the ... | |
| final year project | 12/17/2008 |
| Q: How do I design a low rise building e.g two or three floors, using materials such as reinforced ... A: This is a very complex and involved question to answer over this medium. However, the following ... | |
| Pile Cap Design | 12/15/2008 |
| Q: I just want to know, which code provides most economical pilecap design, Is it preferable to use any ... A: You are correct that the pile cap needs to be stiff enough to uniformly transmit the load, which is ... | |
| e-tabs output check for multistorey residential building | 12/15/2008 |
| Q: after running the e-tabs model including all factors like, type of soil, zone factors, ca & cv. i ... A: The aspects you ask about depend on the shape and aspect ratio of the building and also location, so ... | |
| e-tabs output check for multistorey residential building | 12/14/2008 |
| Q: after running the e-tabs model including all factors like, type of soil, zone factors, ca & cv. i ... A: The checks you should do are: 1. Check the last run log file for any errors, then correct those. 2. ... | |
| flat slab | 12/12/2008 |
| Q: 1. if a flat slab system is analyzed three dimensionally on software-etabs then to calculate ... A: There are several references to ductile detailing, such as the ones below: ... | |
| flat slab | 12/11/2008 |
| Q: 1. if a flat slab system is analyzed three dimensionally on software-etabs then to calculate ... A: Yes, you need to add the stresses from both axial as well as unbalanced bending, which could also be ... | |
| Deflection of flexural members | 12/10/2008 |
| Q: Do I Have to check Deflection of Beams with service loads or ultimate loads. Staad uses the ... A: Most codes stipulate a total deflection limitation of span/250 for service loads only (DL+LL)and ... | |
| use of differential eqns in civil engineering | 12/8/2008 |
| Q: I researched about application of differential equations in civil engineering but i can not find ... A: This is not my area of expertise, but the following websites have some answers for you: ... | |
| RC analysis & design | 12/5/2008 |
| Q: I have 3 questions to ask, i will be grateful if you could answer the questions. 1.Staad gives ... A: 1. Yes, follow the convention that is given in the help menu of STAAD. 2. In most cases that is ... | |
| RC analysis & design | 12/5/2008 |
| Q: I have 3 questions to ask, i will be grateful if you could answer the questions. 1.Staad gives ... A: Here are your answers: 1. Yes, consider both Mx and My 2. Yes you need to ensure they have good ... | |
| concrete technology | 12/4/2008 |
| Q: what are expected value/percentage strength of concrete cube test at 7,21 and 28 days for design ... A: These percentages can vary a lot depending on the mix design and type of cement used, but on ... | |
| MAT FOUNDATION MODEL | 12/2/2008 |
| Q: I have few more questions to ask, i will really appreciate, if you could help me with your ... A: If the 3-7 value is very localised (small area), then you can ignore it. Also make sure you are ... | |
| how to design a RCC footing | 12/2/2008 |
| Q: what is the procedure to design a RCC footing in a building. A: Basically you need to work out the total vertical (gravity) loading and the total lateral (wind or ... | |
| MAT FOUNDATION MODEL | 12/1/2008 |
| Q: I have few more questions to ask, i will really appreciate, if you could help me with your ... A: 1. From the support reactions, you can determine whether the soil bearing capacity has/has not been ... | |
| asking questions | 11/29/2008 |
| Q: what is the role of civil engineering in any society?and speculate on the future of civil ... A: This sounds like a homework/essay question, which really you should do your own research for. ... | |
| Help Please | 11/28/2008 |
| Q: I am very much interested in this course though i feel i am weak in drawing but i can visualise ... A: If you can visualise structures in 3-D, then you can always develop your drawing skills. It is ... | |
| seismic basics | 11/27/2008 |
| Q: i need help in seismic design... Our instructor refuses to teach us seismic analysis...and we don't ... A: If you have an analysis package, then model the building in 3-D, apply a horzontal displacement in ... | |
| Rcc Slab | 11/26/2008 |
| Q: How we can calculate the load on a slab dead load and live load in a house A: You can work out the dead load by knowing the density and size of the structural members and ... | |
| foundation design | 11/26/2008 |
| Q: I am a student civil engineer from Kenya. am made to design a piled raft foundation for 4 no. LP Gas ... A: Jambo, Timothy, If I have interpreted your figures correctly, each tank will weigh around 70,000 ... | |
| How reinforcement to be provided in WALLS | 11/25/2008 |
| Q: Can the derived reinforcement be provided 50% on each face i.e on the earth side and opposite side ... A: This depends on whether the wall is carrying mainly vertical loads (like columns), in which case you ... | |
| Result Analysis | 11/25/2008 |
| Q: please tell me how to analyze the results of the concrete cube crushing test? what is the level of ... A: Usually this is based on statistical data and the standard deviation and current margin as ... | |
| Regarding Machine Foundations | 11/25/2008 |
| Q: Salam How to do the dynamic analysis of foundation on which different types of machines operating ... A: This is quite complex, so it may be better to separate out the bases if possible. I am not an expert ... | |
| RCC Beams | 11/24/2008 |
| Q: Sir, Could you please give instructions or idea for designing an economic section of beam spanning ... A: In oredr to design such a beam you need to estimate the total imposed loading and then analyse it ... | |
| 3d modelling using staad | 11/24/2008 |
| Q: I would be very thankful to you, if you could answer my question. When we make a 3d model of a RC ... A: If you have full continuity rebar (top and bottom) in your beam/column junction, then this can be ... | |
| Honey combing in Structural Members | 11/22/2008 |
| Q: Can you please direct me the remidial measures available for honey combing and the effects of honey ... A: If the honeycombing is in tensile zone (e.g. midspan of beams/slabs), then the main danger is ... | |
| Ribbed slab | 11/21/2008 |
| Q: Sir can you pls direct me on how the rib slab fuction.. Also how about the two way rib slabs ?? ... A: This works like a series of parallel beams (usually at 750 or 900mm centres, connected with a thin ... | |
| Raft foundation help | 11/21/2008 |
| Q: I have a multistorey uilding for which I want to provide a raft type footing.the problem is if I ... A: What you mean is a cellular raft and you will find some info on that in the following website: ... | |
| civil engg | 11/17/2008 |
| Q: Sir, please let me know the approximate total load (DL+LL) for a typical common 2-storey family ... A: This will vary between 14-18 kN/m2 per floor for habitable spaces and about 12-14 kN/m2 for the ... | |
| Regarding plinth beams | 11/16/2008 |
| Q: I would be thankful to you, if you answer this few questions. 1. what is the maximum distance for ... A: If what you mean by a plinth beam is a down-standing beam, then this is a more economical solution ... | |
| Reinforce Concrete Thickness-Please Help | 11/14/2008 |
| Q: I have a problem in which I know the forces on a suspended reinforced concrete slab and the width ... A: The fonmulae are quite complex, so you will need to refer to guides such as BS 8110, or visit the ... | |
| Structural design | 11/13/2008 |
| Q: Is there any special procedure for calculation of shear stress in prestressed members(beams/slabs) ... A: Flat slabs will impose less moments to columns than beams/slab systems when considering lateral ... | |
| Reinforce Concrete Thickness-Please Help | 11/12/2008 |
| Q: I have a problem in which I know the forces on a suspended reinforced concrete slab and the width ... A: Yes, there are formulae for this, which you can see in the following website: ... | |
| Structural design | 11/11/2008 |
| Q: Is there any special procedure for calculation of shear stress in prestressed members(beams/slabs) ... A: In principle there is no difference from normal RC design as the maximum permissible shear stress in ... | |
| Dome Analysis | 11/11/2008 |
| Q: I am trying to make a finite element model of a Dome on Etabs. I understand that Etabs do not accept ... A: Yes there is a very simple way. Draw the curvature of the dome in elevation by a series of straight ... | |
| RIBBED FLOOR CONSTRUCTION | 11/11/2008 |
| Q: I NEED A DETAIL WRITE UP ON RIBBED FLOOR CONSTRUCTION WITH PICTURES AND REFERENCES.THANK YOU SIR A: This is a very efficient form of slab construction which is alos called a Pan Joist system in the ... | |
| raft foundation | 11/10/2008 |
| Q: How would u construct a raft foundationin in soft clay for a large structure(5 storey)? What are the ... A: The advantages of a raft foundation are that it distributes the loading from a building relatively ... | |
| Regarding expansion joints | 11/9/2008 |
| Q: I would be thankful to you, if you answer this few questions. 1. what is the maximum distance for ... A: 1. For retaining wall at edge of property, you can make it work by incresing the base width (length) ... | |
| Final Year Project | 11/8/2008 |
| Q: I'll be starting my final year (undergraduate level) in civil engineering from Pakistan. I am ... A: Good to hear that you are doing your final year. Here are my answers: 1. Yes, if you can find a ... | |
| Regarding expansion joints | 11/8/2008 |
| Q: I would be thankful to you, if you answer this few questions. 1. what is the maximum distance for ... A: The distance for expansion joints is mainly determined by temperature changes and less so by seismic ... | |
| design of strip foundations | 11/3/2008 |
| Q: l am an undergraduate student in civil engineering. Al am currently on industrial training , l have ... A: Ia m afraid that this still does not give me sufficient info, but based on my previous answer you ... | |
| Notes On RCC Designs | 10/31/2008 |
| Q: I am a fresh graduate in Civil Engineering. I am looking for some advice from experts. In this ... A: Try the following website as it has a lot of useful advice/gudelines: For RC buildings, the first ... | |
| design of stri foundations | 10/29/2008 |
| Q: l am an undergraduate student in civil engineering. Al am currently on industrial training , l have ... A: Without knowing the plan dimenisons, it is difficult to confirm figures, but on average a building ... | |
| Costruction Engineer | 10/1/2008 |
| Q: I'm a senior in high school that is doing a paper on construction engineering. If possible, I would ... A: Well, it's a very exciting and fullfilling career, but not as highly-paid as other professions such ... | |
| vertical hilty | 10/1/2008 |
| Q: i had designed the shear wall ,but by mistake at site they have casted the shear wall with some ... A: Depending on whether the bars are subjected to tension or compression, there will be different ... | |
| material science | 9/30/2008 |
| Q: Is the stress value indicates the capacity of the object? how shear force originates in structural ... A: Stress is force divided by area- for example, if there is a beam member 2cm wide by 3cm deep, so the ... | |
| sizing structural materials of a deck | 9/29/2008 |
| Q: In order to use rainwater collected from my roof for household and garden purposes, I need to store ... A: Due to liability reasons, I cannot perform a design for you but merely give advice. I would imagine ... | |
| Structural engineering | 9/29/2008 |
| Q: Sir, How the shear wall is useful for multistoried RCC buildings is it compulsory to provide that ... A: That depends on the aspect ration of the building (height to minimum horizontal dimension) and also ... | |
| SAFE | 9/27/2008 |
| Q: Is there anyway I can receive foundation design examples which I can open in SAFE8? I dont get right ... A: Yes, within SAFE there are several examples that you can review. Also, if you have any problems with ... | |
| rubble packing | 9/20/2008 |
| Q: what is the advantage of using dry rubble packing as a foundation will the building fall down if the ... A: Rubble packing is normally used under ground bearing slabs and sometimes under foundations as well, ... | |
| MS in civil Engineering | 9/19/2008 |
| Q: i am in my final year now n i plan to do ms either in Construction management or structural ... A: Manthan, Currently there are very good job opportunities in both fields so I would suggest you go ... | |
| Civil Engineering questions | 9/16/2008 |
| Q: my name is Joe Bittner and i am a student a Pius XI High School. We have to do a paper on a field of ... A: Hi Cory, My job title is Director of Structures. The starting salary for a graduate in UK would be ... | |
| Interview | 9/15/2008 |
| Q: my name is Cory Briggs. I was recently assigned to write a paper on a career that I am interested ... A: My job title is Director of Structures. The starting salary in UK would be around GBP 25,000 per ... | |
| bending moment | 9/12/2008 |
| Q: I am studying in second year Diploma civil engineering I wanted to know how to calculate bending ... A: This is very basic structural analysis which you will need to read a book to understand. In brief,a ... | |
| Steel deck + concrete diaphragm | 9/12/2008 |
| Q: i'm from italy but i have to design with american codes. I have to design a diaphragm with corrugate ... A: I think this is to do with the shear capacity of the lugs that are welded through the decking on to ... | |
| Concrete specifications | 9/12/2008 |
| Q: In gulf states when we said Grade 25 or Grade 35 concrete what does it mean? What will be the ratio ... A: Grade 25 means the crushing cube strength of the concrete at 28 days is 25 N/mm2. Ditto for 35, 40, ... | |
| Construction Methods | 7/29/2008 |
| Q: How to design a slab of the following:Y=4000mm,X=8000mm using reinforcement of Y12-250c/c-B1-01.What ... A: This sounds like a slab of width 4m and length 8m, with rebar of 12mm diameter (Y means high-yield ... | |
| Inclined columns | 7/29/2008 |
| Q: I WANT TO KNOW HOW TO DESIGN INCLINED COLUMNS A: They can be designed as vertical columns but taking care to design for the additional moments due to ... | |
| E TABS | 7/28/2008 |
| Q: What are the Pros and Cons of using E TABS to design a CONCRETE STRUCTURE ? A: This is a very general question and really depends on the type, size and complexity of the ... | |
| Compaction and compaction eqpment | 7/27/2008 |
| Q: hello sir what is compaction and various compaction masonry in civil engineering? A: Compaction requires different machinery for different materials- e.g. for concrete you need a ... | |
| bidges | 7/21/2008 |
| Q: Archad, what makes Cable-stayed bridges safer than suspension bridges in case of hurricanes and ... A: I have not really thought of this before but I reckon it is because in a suspension brigde there are ... | |
| cracks in structures | 7/20/2008 |
| Q: I am a quality control engineer and I notice we keep getting a lot of cracks in our box culverts and ... A: This could be due to several reasons, such as very thick or very thin concrete cover to rebar, outer ... | |
| Demolition of Existing Slab. | 7/19/2008 |
| Q: I need to demolish a part of a 6" concrete pitch roof slab due to addition of a room on the terrace, ... A: You have not given me sufficielt details to enable me to advise you properly. However, assuming that ... | |
| timber use in bridge | 7/18/2008 |
| Q: Arshad, i have a college assignment looking at an extreme scenario where an 80 m bridge over a ... A: You have not given me enough info to advise properly, but for an 80m free span bridge, you will ... | |
| civil engineering | 7/16/2008 |
| Q: Archad, what's the way to be an excellent civil engineer comparing with the recent world life which ... A: That is a good question. The way to assess engineering excellence is to design and build structures ... | |
| fc and fcu | 7/15/2008 |
| Q: What's the difference between f'c and fcu? How do I convert f'c to fcu? Thanks ANSWER: Hi Ben, ... A: On reflection, fc could mean cylinder crushing strength (usually in USA) and fcu could be a cube ... | |
| Diaphram action of metal deck slab | 7/14/2008 |
| Q: In continuation to your reply to Adam for the above subject i would like to add further question for ... A: 1. No, usually the gravity loading rebar is different from the diaphragm rebar, although the two can ... | |
| Civil Engineering | 7/12/2008 |
| Q: What are the career opportunities do I have As an civil engineer with MBA (Specialization in ... A: Ashish, That depends on what stage of your career you are at. If it is at the beginning, you little ... | |
| grade slab for mobile racks | 7/12/2008 |
| Q: how we can design the grade for mobile racks of heavy load for industrial building, it would be ... A: This would be considered a structural slab on grade, and the design needs to take account of the ... | |
| Flat slab design | 7/10/2008 |
| Q: Respected sir, I, vijay, am doing my masters in structural engineering at IIT Kanpur, India. ... A: The most critical aspects of designing flat slabs are: 1. Punching shear around columns 2. ... | |
| how to start for a job after a long break | 7/7/2008 |
| Q: i am 2004 pass out.i got married when i was in my final semester.my husband worked at Hindalco ... A: Four years is not too long, so long as you have been keeping in touch with engineering. There are ... | |
| Column Reinforcement | 7/7/2008 |
| Q: Reinforcement bar of column at 1st floor cutted by mistake,beam and screed over hollow core slab ... A: The ebst solution for this si to expose about 100mm of the column bars and connect them to starter ... | |
| culvert | 7/7/2008 |
| Q: I am trying to design a 2 span bridge that has the shape of a box culvert as per american code ACI ... A: It's dificult to send/do designs via this medium, but you can either take guidance from the famous ... | |
| Masonry Reinforcement | 7/6/2008 |
| Q: Good Day, Sir! I'm a new Engineer (from the Philippines) here in Bahrain. I just want to ask, what ... A: In that case you need to have a base plate at the bottom of the steel column and anchor that into ... | |
| Masonry Reinforcement | 7/6/2008 |
| Q: Good Day, Sir! I'm a new Engineer (from the Philippines) here in Bahrain. I just want to ask, what ... A: Neil, As Bahrain is not a seismic zone, there are no specific requirements for masonry rebar, ... | |
| Civil Engineering or Archictural | 7/1/2008 |
| Q: I am MansoorKhalid sending you this email from Peshawar Pakistan. I had finished my first year ... A: From what you are saying, you should go for a course in civil engineering and then you can later ... | |
| load bearing capacity of slab | 7/1/2008 |
| Q: salam, sir i have asked a question already about load bearing capacity of a slab. my question was, ... A: This is a bit difficuolt to assess accurately, but based on the info you have given I would say that ... | |
| Structural Engineering. | 6/30/2008 |
| Q: I would like to know is it possible for me to connect steel joist to an existing RCC beam,if so what ... A: Yes, you can do that by using a flange/base plate at the end of the steel member and using drilled ... | |
| chemistry in civil eng. | 6/29/2008 |
| Q: Archad, well why does a civil engineer study courses connected in chemistry? well don't worry about ... A: Chemistry is useful for civil engineering because it helps to understand the materials and how to ... | |
| slab load bearing capacity | 6/29/2008 |
| Q: we have a floor thickness 3 inches of concrete(1:2:4) with .25 inch diameter steel reinforcement @ ... A: This is a bit difficuolt to assess accurately, but based on the info you have given I would say that ... | |
| Eccentric Footing Analysis | 6/27/2008 |
| Q: Sir, I am a Structual Engg. student. My project is going on this topic. i want to know the analysis ... A: By adding in the triangular element all you will do is help in reducing punching shear- your ... | |
| rods in bridges | 6/26/2008 |
| Q: Archad, when a bridge is made over a river, the bridge stands over an arc made of specific elements, ... A: I am sorry, but your question is still not clear- what do you mean by rod? Do you mean a beam or are ... | |
| rods in bridges | 6/25/2008 |
| Q: Archad, when a bridge is made over a river, the bridge stands over an arc made of specific elements, ... A: I do not quite understand your question, but in principle so long as the arch bridge has good ... | |
| column load support | 6/25/2008 |
| Q: hai arshad khan,can u brief me how much load can support by column (300X300X1000MM ht).tq A: The formula for this (assuming axial load only) is 0.35*Fcu*300*300+0.87*fy*As, where fcu is cube ... | |
| RCC LIFT SHAFT, Circular Stairs | 6/24/2008 |
| Q: I have completed my civil engineering and now got a job as a structural designer. I would like to ... A: You have too many questions, most of which you should ask your mentor at work to help you with. ... | |
| beam-column connection | 6/24/2008 |
| Q: Please let me know the connection details of RCC beam to inclined column details, as the bars for ... A: In this case, it is best to take the column bars to the top face of the beam and bend them along the ... | |
| deflected bondeck slab | 6/14/2008 |
| Q: GHi Mr Arshad A bondek floor slab has deflected excessively due to the absence of propping during ... A: As this is a proprietory product, you should really seek advice from the manufacturers. However, in ... | |
| rods in the buildings | 6/14/2008 |
| Q: every buildings has rods, these rods represent the normal reaction of the ground against the weight ... A: If you are talking about reinforced concrete buildings (not steel buildings), then yes there so so ... | |
| pile cap | 6/14/2008 |
| Q: I work in a consultancy firm in kolkata, india. My question is that is it possible to cast a two ... A: This is difficult to say without knowing the piles capacity for lateral bending and the column loads ... | |
| Timber Design | 6/12/2008 |
| Q: I'd like to know which standards are used in timber design, preferably for timber that's available ... A: I do not know about Uganda, but in Kenya the Ministry of Works has a local code that follows the ... | |
| design slab | 6/7/2008 |
| Q: how to design a slab ,rcc members.i want pursue my career as strucural engineer,so please guide me A: This is quite a complex subject, so you will need to study some books, but basically you design as ... | |
| skyscrapers | 6/5/2008 |
| Q: welcome to your returning. well I spend many days waiting you :D well every skyscraper must have ... A: I am not sure I quite understand your question, but basically hihsie buildings are designed to ... | |
| Span & PSF rating for 6" concrete on deck form and I-beams | 5/22/2008 |
| Q: I need to know the maximum span 22 gauge 1.5C conform deck steel can handle with a 6" total depth ... A: I am not familiar with Conform decking (must be a US product), but you need to consult their ... | |
| conection B/w column & Slab | 5/21/2008 |
| Q: I want to know how we do connection b/w column reinforcement and Slab reinforcement. A: Normally this connection is via beams that span into columns, but if you are asking about flat ... | |
| Relevant to steel | 5/20/2008 |
| Q: I want u to tell me the difference between Hot rolled and cold twisted Steel bars, what is ... A: Hot rolled mild steel has lower rebar yield strength (250 N/mm2) while cold twisted HY rbar has 460 ... | |
| Diaphragm shear transfer in concrete slabs | 5/20/2008 |
| Q: I have a question regarding diaphragm shear in concrete slabs. I would like to ask you how this ... A: The principles for diapgram forces in RC slab are the same for what you describe for steel beams ... | |
| RE: CONNECTION BETWEEN R.C STUMP AND HARD WOOD COLUMN. | 5/19/2008 |
| Q: HAI ARSHAD KHAN I WANT TO ASK U ABOUT CONNECTION BETWEEN R.C STUMP (300mmx300mmx1000MM(h))AND WOOD ... A: The best way to do this connection is to design a steel cap at the bottom end of the wood column ... | |
| building science | 5/18/2008 |
| Q: what procedures must be followed when calculate a beams bending moment ,UDL and where in the ... A: For UDL, the bending moment is a simply-supported beam is WL2/8 where W is the total applied +self ... | |
| concentrated loads on an elevated slab | 5/17/2008 |
| Q: I have an elevated slab supported by open web steel joists on 18" centers. I need to install two ... A: Without knowing the spacing of the 6 feet it is difficult to give proper advice, but as a guide the ... | |
| cracks in footing | 5/10/2008 |
| Q: I have observe some cracks not too much deep in footing near the dowels of column reinforcement. I ... A: You have not given me enough details to make a proper assessment but if they are minor surface ... | |
| post tension slab | 5/6/2008 |
| Q: i need to check for opening in post tesion slab.slab in 7.5*7.5 m. opening size is about 1m*.6m this ... A: Although you are designing columns as pinned, in reality they will attract moments from the slab due ... | |
| Concrete slabe on grade | 5/5/2008 |
| Q: Existing 5" concrete slab with no. 4 bars at 24" o/c located at med depth. What point load can it ... A: This is very difficult to assess as it depends on the quality and compaction of the sub-grade and ... | |
| structural engg | 5/5/2008 |
| Q: i am constructed steel bridge over a small nalla & span of bridge is 50 feet & one side rcc paradi & ... A: I am sorry to say that you have not given me enough information and in any case I do not offer a ... | |
| SILO | 5/4/2008 |
| Q: i want to design metal silo foundation, silo is 32m dia & 23 m height & its grain capacity is 8000 ... A: If the RC wall is also subjected to grain pressure then you can design it in hoop stress, with the ... | |
| SILO | 5/4/2008 |
| Q: i want to design metal silo foundation, silo is 32m dia & 23 m height & its grain capacity is 8000 ... A: Much as I would like to help you, I cannot picture what you mean about the shear wall and stiffners. ... | |
| what is honey combing | 5/3/2008 |
| Q: sir what is exactly this honey combing,and where it will occur generally,and even what is ... A: Honey combing is what happens when concrete is not compacted properly and voids form between the ... | |
| assignment | 5/2/2008 |
| Q: the role of civil engineer in the construction company A: I have been asked similar questions before, so if you do not mind I will cut-and-paste the Q & A: ... | |
| rcc beam | 4/25/2008 |
| Q: at one of our existing single storey car wash building, a contractor has cut concrete from the top ... A: This is a bit difficult to say for sure, without looking at the drawings and loading, but in general ... | |
| Rubble packing | 4/12/2008 |
| Q: why is rubble packing done in foundation of footings?does it increase the load bearing capacity of ... A: This is used to basically even out any soft-spots or localised depressions caused by the ... | |
| Design of Lift Well | 3/30/2008 |
| Q: I want to design a lift well in a three storey hospital building. Size of the well is (7ft. x 7ft.) ... A: This is a very difficult question to answer, as a lot depends on what else is spanning on to the ... | |
| STAAD analysis | 3/29/2008 |
| Q: WE are in our final year B.Tech Civil... We are doing a project i.e Analysis and Design of 3 storey ... A: Syed, when you do sub-frame anaysis, the total column loads have to be added separately by hand or ... | |
| STAAD analysis | 3/21/2008 |
| Q: WE are in our final year B.Tech Civil... We are doing a project i.e Analysis and Design of 3 storey ... A: This is difficult to explain over this forum- I suggest you refer to a textbook on structural ... | |
| STAAD analysis | 3/21/2008 |
| Q: WE are in our final year B.Tech Civil... We are doing a project i.e Analysis and Design of 3 storey ... A: Syed, Yes, footing needs to be designed for bending moment, whether on not it is on rock- if column ... | |
| STAAD analysis | 3/20/2008 |
| Q: WE are in our final year B.Tech Civil... We are doing a project i.e Analysis and Design of 3 storey ... A: This is a difficult subject to mentor over this forum, but here are some answers: 1. Loading is ... | |
| etabs beam modeling | 3/14/2008 |
| Q: can etabs model beams spanning from one story to another ie. inclined beams? why is it the line type ... A: Yes, ETABS can do inclined beams and it is just a default description that anything inclined is ... | |
| excavations | 2/28/2008 |
| Q: I am interviewing with a company that does large scale land reclaimations and excavations. What ... A: I am not an expert on this, but basically you should be confident in your responses and do not try ... | |
| Concrete classes | 2/14/2008 |
| Q: Please explain to me the various ratios of concrete.there is class 15 class 20 class 25 and class 30 ... A: Yes, you can usually get classes from 10 N/mm2 in increments of 5 to anything upto 100 N/mm2 or ... | |
| Using steel plate to spread concentrated loadod | 2/13/2008 |
| Q: Arshad, An r.c.slab of an exhibition hall is designed with an imposed live load of 10 kN/m2. A ... A: Yes, that should do the trick, assuming that the base plate is stiff enought to spread the laoding ... | |
| RCC designing | 2/2/2008 |
| Q: what is the bending moment A: This is very basic- it is the moment caused in a beam (or column or wall), due to external loading ... | |
| flat slab | 2/1/2008 |
| Q: I am Deepthi a structural engineer, I wanted to know if a flat slab can be analysed using STAAD. If ... A: STAAD is not very good for flat slab design, but you can get approximate results by meshing the ... | |
| Bearing shear wall system | 2/1/2008 |
| Q: I am designing a 12 story concrete building with shear walls, the frame system is bearing wall ... A: Depending on the detailing, the beams can be fixed or pinned or partially relaesed and ETABS will do ... | |
| Raft foundations | 1/20/2008 |
| Q: Khan, I would like to know how to calculate the thickness of the raft I require for a single storey ... A: The best way for this is as follows: 1. Work out the total load down, and divide by the area of the ... | |
| Mix Design | 1/19/2008 |
| Q: Please let me know the actual mix design with one problem practiced in site A: This is quite a complex issue, as mix design depends on the class of concrete, the aggrrgate type ... | |
| Civil Engineering | 1/17/2008 |
| Q: This question is like a test question. You have three houses in a row, above the three houses their ... A: This is a mind-bender puzzle rather than civil engineering and is difficult for me to answer without ... | |
| Maximum Distance Between Concrete Steel Post | 1/6/2008 |
| Q: What is the Maximum Distance Between Concrete Steel Post and what size of reenforced steel bar ... A: Your question is confusing- are you talking about concrete posts or steel posts? In any case, I ... | |
| Concrete bridges | 12/26/2007 |
| Q: Mr. khan can you tell me about the different kinds of concrete bridge? A: There are many types of concrete bridges, starting from a simple reinforced beam-and-slab for short ... | |
| civil engineering concrete technology | 12/22/2007 |
| Q: please tell me sir, what is 63, 53, 33 grade cements?why is indicated? A: This is related to the compressive strength at 28 days age, in Mpa, and is a function of how finely ... | |
| Design small column & slab | 12/16/2007 |
| Q: My qualification is Technical Diploma in Civil Am working as Auto CAD Designer I am interested to ... A: This is a very general question, so I will reply as follows: 1. Decide on the best material to use ... | |
| Existing Beam- Block Roof to support SIL = 5 Kn/m2 | 12/10/2007 |
| Q: Respected Dear Arshad Khan, i was searching some solution and luckily found your contact through ... A: Much as I would like to help you, I cannot do such assignments over this website- firstly because ... | |
| virendeel truss | 12/9/2007 |
| Q: I am an Iranian student.I really need some guidance for my design project. I want to use Virendeel ... A: Basically you work out the total bending moment and shear, assuming that it is a solid beam, then ... | |
| Vierendeel Truss | 12/9/2007 |
| Q: I wonder if you could provide me with detailed method of analysis of a vierendeel Truss (No ... A: Basically you work out the total bending moment and shear, assuming that it is a solid beam, then ... | |
| Seeking further explanations to your answer to Jarkas | 12/8/2007 |
| Q: Arshad, with regard to the answer you gave to Mr. Jarkas concerning R C Industrial Facilities Design ... A: Sorry for this late reply- I was travelling. I cannot remember the question/answer you refer to, ... | |
| bridges | 12/7/2007 |
| Q: I know that this may not be your "expertise." However, if I could, I would love to still get your ... A: Sorry for this late reply- I was travelling. Your idea of using a warren truss is good- just make ... | |
| Building Design | 12/1/2007 |
| Q: salam brother, I am a civil engineer practicing in site. I need to build a house, but i have not ... A: This is a very general question, so I will reply as follows: 1. Decide on the best material to use ... | |
| Design of slab with opening | 12/1/2007 |
| Q: I want to design a solid slab of size 2m * 2m, with an opening of size 0.6m* 0.6m , at the corner of ... A: Assuming that this slab is supported along all 4 sides, then I would design the slab as two strips ... | |
| ETABS Period/Rigid Diaphragm | 11/30/2007 |
| Q: I built a model of a 5 story building with slabs at each level, 2 elevator shafts and a continuous ... A: You are right, in that the period should be 0.5-1.0 second. I acn only suggest 2 possible problems: ... | |
| Structural Mechanics | 11/30/2007 |
| Q: The distance between the support is 440mm and between left support and cut position is 300mm. Thw ... A: This sounds like a homework question and I would not be doing you a favour by giving you the answer. ... | |
| Civil engineering | 11/25/2007 |
| Q: Respected Mr.Khan,In the case of Ribbed slab with hidden beams & column as supporting structure, ... A: If by hidden beams you mean flush beams, then you can still take full frame action and moment ... | |
| boundary element of shear wall in etabs | 11/23/2007 |
| Q: In ACI 318-99 (also in 2002 and 2005 codes), necessity of boundary elements in concrete shear walls ... A: I am not sure why, but have you tried: Go to the Options > Preferences > Concrete Frame Design ... | |
| Bridge Engineer | 11/17/2007 |
| Q: Mr. Expert i have designed an isolated footing for a circular bridge pier (3 m diameter) resting on ... A: For a 3m dia pier, a 12.5 m base seems excessive. For it to engage uniform pressure, it will need to ... | |
| Silo Foundation | 11/16/2007 |
| Q: Is 1 kg / sq.cm. a very safe soil loading capacity as a thumb rule when the area has many warehouses ... A: Well, it the diameter is only 3m, then you may only need a strip footing of 1.0m wide, depending on ... | |
| Silo Foundation | 11/10/2007 |
| Q: Is 1 kg / sq.cm. a very safe soil loading capacity as a thumb rule when the area has many warehouses ... A: This very much depends on the ground conditions, as in some cases to limit settlement you may have ... | |
| concentrated load on flat slab | 11/9/2007 |
| Q: Can a suspended flat slab designed with a udl of 20 kN/m2 take concentrated loads of 500 kN placed ... A: Definitely not, as that would exceed the safe load by a factor of around 25!! If you meant 5 kN ... | |
| carbon steel tank.. | 10/29/2007 |
| Q: The total weight of the upper tank is 220 Tonnes. Once it is lifted and placed on the base i need to ... A: Faisal, This is not easy to do without looking at the drawings, etc. Just use basic principles- ... | |
| carbon steel tank.. | 10/29/2007 |
| Q: The total weight of the upper tank is 220 Tonnes. Once it is lifted and placed on the base i need to ... A: If the tank is so heavy, then all the clamps are doing is to hold the tank from sliding ... | |
| RC Wall Effective Height | 10/29/2007 |
| Q: Assume a house has a single story 20 foot high by 16 foot wide RC wall (within a moment frame), and ... A: If the mid-height beam is 16 inches in horizontal dimension, to work against the wind loading, then ... | |
| Faculty Project: Metallic construction over concrete ones. | 10/28/2007 |
| Q: I am a Civil Engineering student, and I have to make a small presentation of a Metallic structure ... A: A simple example of where a steel structure is better than concrete is for long-span trusses or ... | |
| scholl project 6 grade | 10/20/2007 |
| Q: i need exemples how i use math in civil engeneering career foe my school project. thank you A: Here are some examples: 1. You can work out the weight of materials, such as a wall sitting on a ... | |
| math in engineering | 10/20/2007 |
| Q: please give me three examples where the applicaion of mathematics is used as a tool in solving ... A: Well, you can use maths to: 1. Calculate the weight of materials on to structures like bridges. 2. ... | |
| from sri lanka | 10/19/2007 |
| Q: please tell slabs types? i want to method statement for single storey building. step by step. ... A: The different slab types are: solid RC two-way spanning, solid RC one-way spanning, ribbed slabs, ... | |
| foundation design | 10/19/2007 |
| Q: I am a graduate engineer and have been tasked with designing the foundations for a two-storey ... A: Yes, you should take th effects of wind laoding into account- basically you can take additional ... | |
| HELP!!!- Bridges Research | 10/18/2007 |
| Q: Tell me what to find out when doing a research paper on bridges for a science fair project? A: I would suggest you look at following aspscts: 1. Diferent materials used- e.g. steel, timber, ... | |
| Beam design | 10/16/2007 |
| Q: I am a student of architecture. can you give me the steps and formula to design a simple rectangular ... A: Basically you divide teh span by 15 to 20 (depending on the loading- the greater the loading, use ... | |
| Help required | 10/16/2007 |
| Q: I am santosh structural engineering student I wanted your help to know certain things. I wanted to ... A: Go to the Research engineers website which has a lot of data on STAAD. You can visit the RCC website ... | |
| on rcc beam | 10/15/2007 |
| Q: in singly reinforced beams bars are placing in two layer with the help of spacial bar,but ... A: The reason that the spacer bars are not taken into account is becuase they are not continuous in the ... | |
| hollow concrete block | 10/5/2007 |
| Q: how do we ascertain design load of a building made with hollow block concrete?what is the density of ... A: You get the density either from the manufacturer's brochure or by weighing the units. The design ... | |
| I need these quick questions answered! by tomorrow | 10/5/2007 |
| Q: Hey Arshad. I'm Brent Gehring and I go to Severna Park High School. I need these questions answered ... A: Well, it's a very exciting and fullfilling career, but not as highly-paid as other professions such ... | |
| concrete design | 9/27/2007 |
| Q: sir, How to repair/strengthen a isolated footing laid with M15 grade concrete instead of M20 grade ... A: You can roughen up the top and side surfaces, drill and grout in some T10 dowels at say 300mm ... | |
| pile cap design | 9/26/2007 |
| Q: i am working in consultant office in Dubai , i want to ask for the design of the following element : ... A: You need to refer to BS 8110 and BS 8004 for design guidelines. Also check out this website: ... | |
| abt. axis | 9/26/2007 |
| Q: sir, could you kindly explain to me the difference between stong axis,weak axis,major axis,minor ... A: Both sets of termionology mean the same. The major axis refers to the deeper section of a beam or ... | |
| Etabs results | 9/17/2007 |
| Q: why (in ETABS 9.0) the sum of moments arises in the bases of shear walls do not equal the total ... A: This depends on how the piers atre defined- basically the moment will be a summation of the node ... | |
| roof slab reinforment details- | 9/15/2007 |
| Q: Mr Khan - Pl. give yr opinion for the following: 1st floor roof: 1) Room size: 11.5ft x 22ft -2 ... A: I do not do designs over this medium, so you should get a qualified engineer to do so for you. ... | |
| What should be the size of columns for 2000square feet slab | 9/14/2007 |
| Q: I am going to construct 2000 Square feet slab with total 26 columns.So what should be the ... A: This is very difficult to answer as you have not indicated the imposed load on the slab, not the ... | |
| soil bearing capacity? | 9/14/2007 |
| Q: how to find the bearing capasity of the soil? can u give me the design prcedure.......step by step. A: For this, depending on the size of the project, you need to do detailed soils investigations that ... | |
| depth of foundation | 9/13/2007 |
| Q: how can we decide ,depth for foundation as a civil engg. in the site one more question sir...its a ... A: Normally the bottom of a foundation is set at a minimum depth of around 0.6m to 0.8m, where the ... | |
| Questions | 9/12/2007 |
| Q: 1. Do you like your job? 2. What kind of projects do you work on? 3. Does your job require working ... A: These are far too many questions, but: Well, it's a very exciting and fullfilling career, but not ... | |
| tuff stone masonry | 9/11/2007 |
| Q: I'm wondering what the compressive strength of tuff stone is. I know this is used a lot in ... A: That depends on the quality of the stone, but anwhere between 2 and 5 N/mm2 would be a crushing ... | |
| Civil Engineering Info. Needed | 9/10/2007 |
| Q: my name is Elizabeth and I attend River Hill High School in Maryland. I am researching civil ... A: Well, it's a very exciting and fullfilling career, but not as highly-paid as other professions such ... | |
| civil | 9/8/2007 |
| Q: I have a house, where there is a peculiar problem of water ingress during monsoon seasons from ... A: Raju, Looks like you do not have a damp-prrof course. You can either break out the slab and install ... | |
| Mezzanine Support Columns | 9/8/2007 |
| Q: Mr. Khan, I am planning to build a 1000 sqft wood framed mezzanine in our warehouse we have ... A: This is a bit difficult to answer without knowing the foundation conditons. If the slab can take 500 ... | |
| High school essay questions | 9/7/2007 |
| Q: 1. Do you have any high school courses to recommend before going to college for engineering? ... A: These are far too many questions for me, but: Well, it's a very exciting and fullfilling career, ... | |
| civil | 9/5/2007 |
| Q: Why putting reinforcement for slab, why do we put steel in both directions. ANSWER: Hi Raju, This ... A: This is difficult for me to answer without further details and in any case I do not do full designs ... | |
| civil | 9/1/2007 |
| Q: Why putting reinforcement for slab, why do we put steel in both directions. A: This is for 2 reasons: 1. To prevent shrinkage cracks in the cross-direction. 2. When you load a ... | |
| ribbed(hollow block) slab | 8/31/2007 |
| Q: we are constructing a cast in situ ribbed (hollow block)slab in ethiopia for an occupation of a ... A: Again, without knowing the actual ribe tension rebar and the deflection criteria, it is difficult to ... | |
| raft design | 8/29/2007 |
| Q: I would like to you to help me solve the following problem. The soil safe bearing capacity of a ... A: I am sorry but I cannot offer full design services over this medium. As a guide, use 1 m thick raft ... | |
| english | 8/24/2007 |
| Q: Sir I am HAPPY TO SEE YOUR ANSWER why horizontal cracks in top floor building. & how to repair I am ... A: This is probably caused by: 1. Shrinkage cracks in blockwork 2. Lack of movement compatibility ... | |
| Honey Combing In Concrete | 8/23/2007 |
| Q: We have got honey comb in the concrete of grade M40 used for column member(size of column- 800x800). ... A: Honeycombing to a depth of 25mm is not very serious so you can simply grout this up and the column ... | |
| interview. | 8/21/2007 |
| Q: HEY!!! my name is Brittany Feeback I am 16&&Go to Trigg county High school. I would like to be a ... A: Hey, Brittany!!!! Well, it's a very exciting and fullfilling career, but not as highly-paid as ... | |
| concrete slab strength | 8/21/2007 |
| Q: I am building a concrete slab that will cross a creek in my backyard, the creek has a 10' gap and ... A: This is not an easy question to answer as you have not given full details- i.e. weight of tractor, ... | |
| corbonation | 8/12/2007 |
| Q: please let me know the reasons of carbonation in Reinforced Cement Concrete ANSWER: Hi Bhupinder, ... A: The main source of carbonation is exposure to the atmosphere and then with the additional presence ... | |
| corbonation | 8/11/2007 |
| Q: please let me know the reasons of carbonation in Reinforced Cement Concrete A: Carbonation in concrete is the slow process of carbon dioxide penetrating the concrete cover of RC ... | |
| criteria for tempeareture analysis of slab in rcc building | 8/10/2007 |
| Q: pls provide some guidline & references to decide whether temp anylisis of slab is require or not in ... A: If basement is subjected to daily temperature variations then you will need movement joints- these ... | |
| Flat slab analysis using SAFE8 | 8/8/2007 |
| Q: i am currently analysing flat slab of a 20 storey tower using safe, input of which is imported from ... A: For a tall building, you should select the third option, as that will take loads due to gravity ... | |
| criteria for tempeareture analysis of slab in rcc building | 8/7/2007 |
| Q: pls provide some guidline & references to decide whether temp anylisis of slab is require or not in ... A: The 45-50m can be avoided if the structure is below ground (basements), otherwise you need to do a ... | |
| design of slab | 8/6/2007 |
| Q: Room size is 3.00 x 7.04 & outer size is 3.46 x 7.50 M. Hence what will be the thickness of slab & ... A: I cannot design the slab for you over this medium- in any case that depends on the applied loading. ... | |
| PIPERACK DESIGN | 8/5/2007 |
| Q: I am civil engineer,but i have no idea about design of piperacks,i was asked to design piperack,will ... A: Pipe rack design is basically supports (usually with structural steelwork) for supporting pipework ... | |
| type of supports | 6/18/2007 |
| Q: Sir,Differentiate types of Supports and give examples of each support that when it is used A: Santosh, This sounds like a homework question? Anyway: 1. Simply supported- when a beam or slab ... | |
| RCC slab | 6/16/2007 |
| Q: What is the difference between simply supported slab & Continuous slab?For example ,I will design ... A: Yes, you are correct- the slab can be designed as continous over the central supporting beam or ... | |
| rcc design | 6/11/2007 |
| Q: i have a slab of thickness 150mm and clear span of slab is 3.8 m m-25 mix we want put two load at ... A: I do not do designs over this forum due to liability reasons, but you can work out the bending ... | |
| Foundations | 6/7/2007 |
| Q: What is the main difference between strip foundation and raft foundation? Do strip foundations ... A: A matt foundation is the same as a raft- different name only. A raft works by bending along both ... | |
| civil engineering | 6/3/2007 |
| Q: How the alignment is done for the columns above a floor,to check whether it is ... A: The timing for de-shuttering depends on the concrete strength, the spans and the curing, but ... | |
| Foundation for lift well for G 2 building | 6/2/2007 |
| Q: I am a structural engineer in Eritrea. i am designing recently a 2.1x2.1m lift well for G+2 concrete ... A: For this, just consider the total vertical load down the wall per metre run and design a strip ... | |
| steel bracket dimension | 6/2/2007 |
| Q: i wanted to know:1) how we arrive at the dimensions of a steel bracket ,say,which is supporting a ... A: The sizing is dependant on the shear capacity of the vertical section to resist the bolts reaction ... | |
| Four and a half inches RCC slab | 6/2/2007 |
| Q: I want to have a 4.5 inches RCC slab (Roof), area 8 feet by 22 feet supported by 10 feet high, walls ... A: You have not indicated roof loading, but assuming it is minimal, this should be OK with proper rebar ... | |
| civil engineering | 5/30/2007 |
| Q: How the alignment is done for the columns above a floor,to check whether it is ... A: For verticality you can use a simple pmumb-bob, or a theodolite. For horizontal location you can use ... | |
| U/G pipes | 5/28/2007 |
| Q: Sir, How to calculate pipe thickness of underground pipes? is there any formula given any where? I ... A: Visit the following websites that will guide you: ... | |
| civil/piping | 5/26/2007 |
| Q: Sir, I am a piping engineer and wants to give piping loads to civil dept. for designing a piperack ... A: Just work out the self weight and weight of contents per metre run and the racking can be designed ... | |
| raft foundation | 5/24/2007 |
| Q: I am shridhar kadam student of VJTI. I Want detail infor mation about RAFT FOUNDATION.So plese send ... A: Your question is not quite detailed enough for me to respond properly, but if you are asking about ... | |
| Charterd ENGG exam UK | 5/20/2007 |
| Q: i m shafaat srcutural engg with 13 years exp working in Dubai i got offer from London Uk and i m ... A: In order to become a Chartered Engineer via the ICE or IStructE, you need to have a good degree and ... | |
| engineering | 5/20/2007 |
| Q: How many seismic zone we know give me detail information A: There are several seismic zones in accordance with UBC 97- starting with zone 0, 1, 2A, 2B, 3, 4, 5, ... | |
| stress | 5/11/2007 |
| Q: i heard a term " cylinder stress" can you tell me about this? A: Possibly this is the same as what I know as hoop stress, which is the force/divided by cross ... | |
| raft foundation design | 5/4/2007 |
| Q: Arshad I am an undergraduate student studying civil engineering in the UK.I have a task I'd like ... A: This is a problem of soil-structure interaction, whereby the strength/thickness of the slab is ... | |
| tech | 5/4/2007 |
| Q: i find it really hard to connect the theory of over reinforced concrete to the practical situation. ... A: So long as you follow the code requirements for slice lengths (especially for bundled bars), then ... | |
| tech | 5/4/2007 |
| Q: i find it really hard to connect the theory of over reinforced concrete to the practical situation. ... A: Early striking is mainly for re-use of shutters and follow-on trades. There is no problem with ... | |
| tech | 5/4/2007 |
| Q: i find it really hard to connect the theory of over reinforced concrete to the practical situation. ... A: It's not just for corrosion protection, but also for bond and fire protection- hence we need more ... | |
| tech | 5/3/2007 |
| Q: i find it really hard to connect the theory of over reinforced concrete to the practical situation. ... A: Yes, if you over-reinforce say the bottom of a simply supported beam, and then keep increasing the ... | |
| splicing | 5/3/2007 |
| Q: a continuous column does not have the starter bars at the right position for the next level(but ... A: ..., For circular columns you do not need cranks- just lay the rebar adjacent to the starters. You ... | |
| rings on columns /stirrups on beams | 5/3/2007 |
| Q: 1. for columns , which is better - to provide rings horizontally or spirally? 2. for beams , i ... A: Basically, shear cracks in beams are at 45-60 degrees angle to horizontal, so an inclined bar will ... | |
| rings on columns /stirrups on beams | 5/2/2007 |
| Q: 1. for columns , which is better - to provide rings horizontally or spirally? 2. for beams , i ... A: .., 1. Rings horizontally are better for control of spacing and location of main rebar. 2. They ... | |
| Mehtod Statement | 4/27/2007 |
| Q: How would you calculate the area of a pad foundation to loaded column, where the total internal load ... A: This is easy- just divide the total vertical load (730 kN) with the allowable bearing pressure, so ... | |
| Temperature effects on Tall Buildings | 4/25/2007 |
| Q: Could I analyze a tall building in United Arab of Emirates for Temperature Effects using ETABS ... A: Answers: 1. For final state, take interiors as 20 degC and exterior 30-50 deg C depending on amount ... | |
| Temperature effects on Tall Buildings | 4/24/2007 |
| Q: Could I analyze a tall building in United Arab of Emirates for Temperature Effects using ETABS ... A: 1. Yes. 2. Yes, and les to interior members, so you will get differential elongation. 3. You will ... | |
| Temperature effects on Tall Buildings | 4/23/2007 |
| Q: Could I analyze a tall building in United Arab of Emirates for Temperature Effects using ETABS ... A: Yes you can, but you need to know the cladding/insulation details and how hot the exterior can get- ... | |
| strip foundation design | 4/23/2007 |
| Q: How would you calculate the minimum width and depth required for a tradtional strip foundation for a ... A: That's simple- divide 45 by 80 and you have the minimum width of the strip, i.e. 565mm. However, I ... | |
| Calculations | 4/20/2007 |
| Q: What is the full calculations for a petrol station using a suitable foundation with an internal and ... A: I am sorry but I cannot do sketches over this forum. For the column foundations, you need to know ... | |
| Project Engineer | 4/19/2007 |
| Q: Please help me with answers to the following: What is Project engineering all about 1.what are the ... A: A project engineer's main duties are to understand the client's requirements (brief) and to ensure ... | |
| Quotations | 4/18/2007 |
| Q: What does zack mean in a quation sheet? There are different areas of building, including one long ... A: Well, that's a new one for me too. I suggest you seek clarification fom the client. Maybe it is a ... | |
| d.o.s | 4/13/2007 |
| Q: why the circular tank of large capacity are most economical than other shape...???? A: That is because steel is very efficient in tension (rather than bending), so by using a circular ... | |
| wind load | 4/12/2007 |
| Q: I have tank of 5 ton dead load and 400 barrel water capacity, ares where wind load 0.87 kpa, ... A: This is a bit difficult to explain over this forum, but basically you apply the pressure along one ... | |
| honeycombing in concrete | 4/12/2007 |
| Q: Kindly let me know the acceptance criteria on subject matter. Regds PNM A: This depends on the location and extent. Usually, most honeycombing, if it is just within 10-30mm of ... | |
| ETABS | 4/11/2007 |
| Q: i´m a new user of the program etabs. MyIs it possible to make the shear design based on provided ... A: I am new to ETABS as well, but I believe it does take main rebar into account for shear design. I ... | |
| mat foundation | 4/11/2007 |
| Q: the whole consideration for design mat foundation for tall building ANSWER: Dear Farhana, Your ... A: I am sorry, but I cannot carry out full designs over this forum- I just answer specific questions ... | |
| mat foundation | 4/10/2007 |
| Q: the whole consideration for design mat foundation for tall building A: Your question is not quite detailed enough for me to respond properly, but if you are asking about ... | |
| Wind Loads in Uganda | 3/31/2007 |
| Q: Arshad, What is the Basic Wind Speed that one needs to consider for the design of Structures in ... A: Srinivas, I am afriad I am a bit out of touch with current procedures in Uganda as the last time I ... | |
| Eccentric Load at Foundation | 3/18/2007 |
| Q: Mr. Khan- I need to do an eccentric load check on a residential foundation at a point load. The ... A: I normally do not design over this forum, but if the figures you have quoted are correct then it's a ... | |
| Three-hinged beam | 3/7/2007 |
| Q: I have an assignment that it is "three-hinged beam" with a point load (say 50 kips right at the ... A: First you have to ask what the boundary conditions are- i.e. teh columns at either end. Are they ... | |
| Tempeture effect | 2/7/2007 |
| Q: What temperature effect may be at any building due to high temperature & coldness. A: Basically this will mean that the external surface will be expanding or contracting at a different ... | |
| pad foundation calculations | 2/1/2007 |
| Q: How would you calculate the plan area of a pad foundation to anaxial loaded column, where the total ... A: That is simple- just divide 195 by 205 and the answer is the pad area in m2. However, this assumes ... | |
| Math | 1/12/2007 |
| Q: What is a mathmatical equation relating to math that someone in the field would understand if I were ... A: I am not sure what you are asking, but one maths formula would be area of a circle= pie x r x r. Or ... | |
| ETABS | 1/2/2007 |
| Q: Wish you & your Dear Ones a Happy & Prosperous New Year 2007. I would like to know the following: - ... A: 1. For hollow core slabs, to simulate one-way loading on to beams, you should use "planks". 2. This ... | |
| parameters of class 25 concrete | 12/30/2006 |
| Q: I did a cube crushing test and the 28 days results gave me 22.2N/mm2. I would like to know if my ... A: Based on just one test, yours has failed. Normally lots of tests are done on the same mix of ... | |
| School assignment | 12/28/2006 |
| Q: My name is Michael. I am a student at Brooklyn Technical High School in New York. My assignment ... A: Due to the nature of this service, we do not give out personal email details, nor are we suppossed ... | |
| ETABS | 12/24/2006 |
| Q: - Can I know difference of rigid & semi-rigid diaphragm in ETABS. - I couldn’t find any option for ... A: Sorry, I was travelling hence delay in replying: 1. Rigid diaphragm allows no in-plane deformation, ... | |
| ETABS | 12/20/2006 |
| Q: I am a new user using ETABS Nonlinear v9.0.9 version for design of RCC buildings. I would like to ... A: I am fairly new to ETABS too, but I can answer as follows: 1. Suggest you use semi-rigid diaphragm, ... | |
| footing design | 12/11/2006 |
| Q: Sir, I am analyising a piperack str. in which two piperacks are meeting at the junction say piperack ... A: This is difficult to answer without looking at the plans and knowing the foundation conditions. ... | |
| Foundations | 12/3/2006 |
| Q: what foundation would be most suitable for a factory which is to be erected on the site of a ... A: This is difficult to answer as it all depends on how well the limestone has been compacted, how long ... | |
| Condensation | 11/20/2006 |
| Q: I am trying to calculate whether condensation could occur within a composite roofing structure. The ... A: I am sorry, but I am not an expert on this subject. I hope you can get help elsewhere. What I can ... | |
| Civil engineers | 11/17/2006 |
| Q: What type of people enter the field and what values do civil engineers have? A: Well, it's a very exciting and fullfilling career, but not as highly-paid as other professions such ... | |
| RCC beam slab | 11/12/2006 |
| Q: I am a student of architecture. Can you please tel me if i can have a room of 24m by 15m with no ... A: Yes, you can but you will need downstand beams of about 1.2m depth spanning 15m from the columns at ... | |
| 7" slab strength | 11/11/2006 |
| Q: I am on the 3rd floor of a converted industrial loft building. I am building a concrete block ... A: My only comment is that you need a competent structural engineer to study the design drawings of the ... | |
| Civil Engineering (Retrofitting) | 11/11/2006 |
| Q: There is tank made of stone masonary and platered all inside and the tank is now damged in EQ and ... A: I presume this is a circular tank and that the main structure is not damaged or badly cracked? If ... | |
| Civil engineering job | 11/2/2006 |
| Q: There is a perception amomg many people that jobs in civil engg are really tough compared to other ... A: No, that is not the case- you can have a very high powered and office based job with an excellent ... | |
| Maintenance | 10/28/2006 |
| Q: I have often been confused about maintenance, as it relates to Civil Engineers. How can Civil ... A: Basically, it relates to regular inspections and remedial work on items that have sufferred from ... | |
| Wind Load | 10/28/2006 |
| Q: How Dynamic Effect of Wind Load taken in to consideration in Tall Buildings ? A: For tall buildings, there are approximate formulae to calculate the dynamic loading, but generally ... | |
| Engineering | 10/26/2006 |
| Q: Hello, my name is John O'Donnell and I want to become an engineer. My brother is an engineer and it ... A: I am asked this question quite often, so if you do not mind, I will cut and paste a Q&A below, which ... | |
| pipe design | 10/25/2006 |
| Q: i have figured out that headloss is 40m now giving me the slope, ... A: I am not an expert on this, but looking at the formula, if V is the velocity then you can get that ... | |
| Pad Foundation | 10/22/2006 |
| Q: But these web sites are just showing solved examples. Whereas i want to know that how the formula is ... A: The formulae are given in the link I sent you and are based on the basic principles of physics- i.e. ... | |
| Pad Foundation | 10/21/2006 |
| Q: A quick question. If Pad foundation comes under eccentric loading P. Pad having dimension D and B. ... A: You will find the answer/formula at the following website: ... | |
| statistics on its contribution | 10/18/2006 |
| Q: I would like to know if civil engineers save more lives than doctors or is my statement true? If its ... A: In abstract terms, yes Civil engineers do save many more lives than doctors, as if they did not ... | |
| ultra high performance fibre reinforced concrete | 10/18/2006 |
| Q: could you please explain ultra high performance fibre reinforced concrete, it's make up, properties, ... A: I am sorry but I do not have personal experience of using this material. However, the following ... | |
| good career choice? | 10/17/2006 |
| Q: Please, please, please help me. I've applied to do Civil Engineering at University, but I'm ... A: Yes, you can make good money, but probably later in your career. It is not as well paying as ... | |
| footing design | 10/16/2006 |
| Q: I have a problem of designing a column at the boundary of the site and footing design to be done for ... A: It is difficult to explain that through this medium, but if you put some key words in google, you ... | |
| Salaries in RSA and Angola | 10/13/2006 |
| Q: I have a masters in Civil Engieering construction management from the university of texas austin and ... A: You have not mentioned how many years experience you have as salaries and openings depend on that. ... | |
| Raft foundations | 10/9/2006 |
| Q: Is good practice put the piles under de colummns in a pile-raft foundation? A: There is no reason not to put piles right under the columns- basically the layout and spacing of ... | |
| Example of math/work | 10/5/2006 |
| Q: Hey I'm thinking about going into Civil Engineering. What I do know is that it's one of the easier ... A: The maths can get very complex if you do it long-hand, but these days there are tools such as ... | |
| The role of civil engineers | 10/4/2006 |
| Q: I'm a student who study in civil & structural engineering course in Malaysia.I want to ask that what ... A: In a nutshell, the role is in designing projects which are safe, economical, durable and functional, ... | |
| Point Load in One Way Slab | 10/4/2006 |
| Q: I search a theorical approach to design a point load in a one way slab. Suppose I got a one way ... A: The rule of thumb for this is that you use a width of slab equal to one fifth of the span, so in ... | |
| math | 9/29/2006 |
| Q: what is the specific job of a civil engineering? A: I am a bit confused- are you asking about math or civil engineering? Anyway, just to confirm that ... | |
| Construction-future | 9/28/2006 |
| Q: I am doing a project on the possible future wonders of the world..and i just cant remember the name ... A: There are several such projects proposed. Here are a few links: ... | |
| Construction /Civil Engineering Terms | 9/24/2006 |
| Q: I always have problems in identifying the materials, equipments or terminology of construction or ... A: Try this website- it has a wealth of info and links: http://www.guideme.com/CivilEngineering.htm A ... | |
| Thermal Expansion of a Pipe | 9/21/2006 |
| Q: What's the formula for the increase in the outside diameter of a pipe when it heats up? And what's ... A: John, This not my area of expertise, but I would imagine that the formula would be: Coeff of ... | |
| Slab Strength | 9/20/2006 |
| Q: I have a oil tank which I would like to place on a slab of concrete. The concrete is an average of ... A: As a direct pressure on the concrete, it should be OK (you have not mentioned grade of concrete or ... | |
| Pad Foundation | 9/11/2006 |
| Q: I am in the process of calculating the foundation size for a second floor extionsion, supported by 2 ... A: Basically you will need to work out the total weight of the pier and the floor/walls/live load that ... | |
| example of design calculation of rc structure | 9/9/2006 |
| Q: I am going to indergo my profesional exam. I need some hand design calculation examples for me to do ... A: I cannot send you examples through this forum, but if you go to the following website and click on ... | |
| Raft foundation+forklift movement | 9/6/2006 |
| Q: I have this situation: a. 3 story building with raft foundation of 60cm depth. b. forklift ... A: I do not design structures over this forum, but I will answer your questions as far as the info you ... | |
| Strengthen the concrete | 8/21/2006 |
| Q: how can i strengthen the concrete with 1200psi to 3000 psi? A: This depends- if it is already cast, solid, there is nothing you can do, but the concrete will gain ... | |
| Pad foundations | 6/12/2006 |
| Q: I have a steel column which is to carry a load of 25Te, is a pad foundation the right foundation to ... A: This is not easy to answer as it depends on many factors- e.g. is the column braced in all ... | |
| Modelling structures | 5/19/2006 |
| Q: I wish to know how we go about modeling a civil engineering structure. Specifically bridges. I'm ... A: This is a complicated subject that I cannot go into over this medium. I suggest you buy some ... | |
| foundation decision | 5/14/2006 |
| Q: I need help with deciding if it is a good idea to use a concrete pad foundation or the traditional ... A: Foundations are very difficult to advise upon remotely as there are too many variables and potential ... | |
| Mohrs theorm | 5/9/2006 |
| Q: Sir, Plz tell me how to understand mohr's theorem for structural analysis and if possible for ... A: The definition for structural analysis is as follows: Used for determining slope and deflection of ... | |
| Vierendeel Truss | 5/1/2006 |
| Q: I have a question about Vierendeel Truss (no diagonals) that I have to solve it by hand (because of ... A: That is easy! Just work out your overall bending moment and shear force diagram between the 2 main ... | |
| Professional Fee | 4/14/2006 |
| Q: I'm just new as a civil engineer in CA and would want to know the professional fee on designing a ... A: I am sorry but I have no idea of how much fee is charged in CA, but as a guideline, I would apply ... | |
| tower cranes | 3/24/2006 |
| Q: I would like to request more information to the answer you gave on 6/20/2005 regarding tower cranes. ... A: What you would do is to dismantle the smaller crane into small enough componenest to enable ... | |
| Force vectors | 3/12/2006 |
| Q: How do you calculate the horizonal vector of force in a case where a conical object with weight 'w' ... A: From first principles, and ignoring friction, and assuming that the material of the cone is quite ... | |
| eccentric footing | 2/22/2006 |
| Q: First I realy appreciate your help to whome realy need to go on with one's feild without any ... A: Yes, you have to design it as required by the geometry, for example for a boundary wall this is a ... | |
| Suspension bridges | 2/16/2006 |
| Q: I'm doing a science fair project at school, on "how can a suspension bridge hold so much weight ... A: The main reason is that suspension bridges work on the principle of tension in a cable, which is ... | |
| Stiffness Calculation | 1/30/2006 |
| Q: I have been trying to find out about stiffness calculation. This can be stiffness of vertical steel ... A: Go to this website and download the pdf document- it has all the answers. ... | |
| civil engineering safety and equipment | 1/26/2006 |
| Q: can you tell me what safety precautions civil engineers use and what type of special equipment they ... A: If you mean what they use when out on site, the the answer is as follows: 1. A pair of safety shoes ... | |
| Engineering | 12/29/2005 |
| Q: What special skills would you need to suceed in engineering? A: Well, you ahve not mentioned which type of engineering (civil, structural, mechanical, electrical, ... | |
| Plate thickness calculation for a Wall Plate | 12/2/2005 |
| Q: I have been trying to find out the best way to calculate plate thickness of an embeded wall plate ... A: Your principle seems OK, but I do not know what a nelson stud is, nor it's diameter. Have you taken ... | |
| "Floor" Finite Element Analysis Program | 11/20/2005 |
| Q: First of all, I would like to thank you for answering my earlier question. This time, I would like ... A: I think you are referring to the ADAPT-Floor software, which is a very good one for PT flat slabs. ... | |
| Stress Distribution formula when e>L/6 | 11/13/2005 |
| Q: My question is regarding stress distribution formula due to eccentric loading (say on a retaining ... A: The formula you quoted needs slight correction: When e<L/6, sigma (max. soil pressure)=P/A * (1 + ... | |
| Channel strength | 10/16/2005 |
| Q: This may sound trivial, but it is important to me. Which of the following is strongest? 1. 1" ... A: This is not a trivial question, but a good one! The answer to your question is as you say- the 1" ... | |
| Aerodynamics | 9/15/2005 |
| Q: I am a M.Tech. student. I wanted information about aerodynamics, how is it related to civil ... A: Aerodynamics is relevant to civil engineering mainly to do with the effects of wind on buildings, ... | |
| Translucent concrete | 8/30/2005 |
| Q: hmmm..it's possible I am incorrect about the direction in which the fiber optics are laid, and each ... A: I am not an expert in sound proofing, but I guess something like a car silencer would work- lots of ... | |
| Translucent concrete | 8/25/2005 |
| Q: ------------------------- My understanding from a recent Science News is that the concrete is poured ... A: What you describe would probably only be translucent along the longitudinal axis, but using ... | |
| Translucent concrete | 8/23/2005 |
| Q: I am really excited by the recent invention of translucent concrete. Can you tell me if anything ... A: As you said, this is a fairly recent invention and not much has been published about it. All I know ... | |
| rammer construction | 8/4/2005 |
| Q: STATEMENT OF PROMBLEM Q1)What exactly is the 2.5kg rammer used to solve. PURPOSE OF ... A: I am really sorry to say I do not know what a 2.5 kg rammer is, unless it is for compacting cubes? ... | |
| Tower cranes | 6/20/2005 |
| Q: I saw your earlier response about how the tower cranes are supported, but my question is how are ... A: The crane within a building is usually mounted on the walls of the lift shaft and it is jacked up as ... | |
| tuning combs | 5/25/2005 |
| Q: but another question...isn't the musical instrument thingy called a tuning fork [with 2 prongs]? ... A: Yes, you are absolutely right- the musical ones are forks. Visit the following website to get some ... | |
| tuning combs | 5/24/2005 |
| Q: I recently acquired a set of tuning combs. They look old, are metal [brass?] and came in a brass ... A: As far as I know, these are used more in mechanical engineering (where vibration and frequency of ... | |
| construction crane counterweighting | 4/20/2005 |
| Q: Construction cranes seem to all have a big "box" hanging from their back ends-- is this the ... A: Well you are quite right- such cranes would topple over if they did not have travelling ... | |
| construction crane counterweighting | 4/20/2005 |
| Q: Construction cranes seem to all have a big "box" hanging from their back ends-- is this the ... A: Yes, that is the counterweight and it is calibrated to balance the median of the max and minimum ... | |
| Concrete Shear Loading | 4/15/2005 |
| Q: I have a 4 inch concrete slab sticking out of the side of my house over a window. What is the ... A: This question cannot be answered by any engineer unless he knows the amount and placement of main ... | |
| Creativity and Civil Engineering | 4/3/2005 |
| Q: How are you? My friend is trying to apply for an internship, and he has to write a short paper ... A: This is such an open-ended question, it is difficult to answer through this medium. Maybe he can ... | |
| Working in Africa | 4/3/2005 |
| Q: I have been offered to work in Mozambique. They offered me 7000€/month plus 180 US$/month. I have 4 ... A: I have no experience in Mozambique and I do not know the cost of living there, nor the terms and ... | |
| Estimating | 3/22/2005 |
| Q: Given a working drawing of abuilding, what procedures or guidelines should one follow in order to ... A: Basically you have to measure the materials of permanent construction (e.g. concrete, rebar, ... | |
| R.C.C Design | 3/9/2005 |
| Q: I would like to know a detailed procedure (Calculation with formulas & abravations) for a R.C.C ... A: This is too long a subject to describe through this medium. The basics of design are to: 1. ... | |
| roadworks | 2/28/2005 |
| Q: ------------------------- Followup To Answer - You're welcome! Ok, well i guess im right, on all ... A: 1. Past track record, experience, reputation and references. 2. Meeting tight deadlines and accuracy ... | |
| roadworks | 2/28/2005 |
| Q: ------------------------- Followup To Answer - Hi Mbenic, It's not my area of expertise but I ... A: Yes, you have the basics correct. Of course, before the earthworks one has to do the setting out in ... | |
| bridge and army | 2/19/2005 |
| Q: is this true that army never marches on a bridge because this can cause resonance and bridge can ... A: Yes, this is very true. You amy have head of the Millenniem Bridge in London which on the first day ... | |
| Load weight question: Deck | 2/13/2005 |
| Q: We built a new deck onto our house one year ago with the intention of adding a hot tub in one ... A: I had replied earlier, but seems it did not get to you. I regret I cannot design over this forum ... | |
| reinforcement | 2/11/2005 |
| Q: 1.how calculate the vertical overlaps in colum for 2nd floor 2.how calculate the "L" bent in column ... A: These are difficult questions to answer through this medium. I suggest you study a book of basics in ... | |
| About modelling RC | 2/4/2005 |
| Q: I hope that you can help me with this! I am designing a small rural clinic as part of a project and ... A: This is difficult to explain properly through this medium, but in general all software work like ... | |
| Bridges | 1/27/2005 |
| Q: I am building a bridge for a physics class and was wondering what the strongest type of bridge would ... A: You have a very interesting project. The different types of bridges are suited for different spans. ... | |
| bracing value of masonry walls | 1/16/2005 |
| Q: I live in a small country town in Australia. I did a materials engineering degree at university but ... A: Design of blockwork is not an exact science, especially when you are assessing strength not ... | |
| an eggcatcher | 1/14/2005 |
| Q: in my physics class we have to do an experiment of designing a egg catcher. This egg catcher can ... A: I guess the best way to do this is to design a channel with has a cross-section of a semi-circle ... | |
| ground settling | 1/14/2005 |
| Q: I have a question in regards to ground settling. Our parking lot is settling in a certain area ... A: It is very difficult to give advice about ground problems without physically inspecting it. However, ... | |
| bracing value of masonry walls | 1/13/2005 |
| Q: I live in a small country town in Australia. I did a materials engineering degree at university but ... A: I am not sure what you mean by bracing value, but if it is about lateral bracing of a building by ... | |
| Civil Engineering Question | 1/8/2005 |
| Q: I am Stephanie, a first year university student (not enrolled in engineering though). I came across ... A: Yes, you have the calculation correct, except that you have to have consistent units, so first ... | |
| Civil Engineering Question | 1/7/2005 |
| Q: I am Stephanie, a first year university student (not enrolled in engineering though). I came across ... A: This one is easy as pie! The deflection formula for a simply supported beam with pin supports is: ... | |
| Damage detection | 1/6/2005 |
| Q: Hope u to be fine out there. Do u have any experience in research for the damage detection of ... A: No I do not have direct exeperience of this but I did a quick search for you. Try the following web ... | |
| Bridge construction | 12/31/2004 |
| Q: I am doing a science fair project on civil engineering. The project is about which bridge can hold ... A: You have a very interesting project. The different types of bridges are suited for different spans. ... | |
| Tunneling | 12/20/2004 |
| Q: This may not be your specific subject but your profile seemed the closest I could find. It occurred ... A: The main reason for this is to prevent a form of visual hypnosis in drivers if they drive for long ... | |
| basic information | 9/10/2004 |
| Q: Can u tell me what is the "Principle of virtual work" , "Castigliano's theorem" and "Unit ... A: It's been a VERY long time since I was taught these theorems, so the best way for you to learn them ... | |
| Straw structures? | 9/9/2004 |
| Q: I recently had to build a drinking straw structure in order that it might support the wieght of a ... A: I would say that you should build a tower of say 3"x 3" square on plan, with 4 no. 8" long columns ... | |
| notional load to building | 9/8/2004 |
| Q: According to BS code BS8110(similar to other codes), there is a requirement that the building must ... A: Here are the answers: 1. Yes, apply it at basement and ground floor levels too. 2. Yes, the ... | |
| Why are canals in Central... | 6/13/2004 |
| Q: Why are canals in Central AZ designed with an unenclosed top? A: I am not sure where AZ is (Azerbaijan?), but usually any canals that are open-top are usually ... | |
| building design | 6/5/2004 |
| Q: respected sir, How can I be expert in the design of buildings. what books I should study. A: This is a difficult question to answer. Basically you need to do a course in structural engineering ... | |
| can forecast earthquake's... | 5/31/2004 |
| Q: can forecast earthquake's time and its place? A: The science of predicting earthquakes is not very good for the long-range, although instruments can ... | |
| H-Beam cantilever | 5/30/2004 |
| Q: When I had my manufactured home installed I had the beams upgraded to a 10" H-Beam so that I did not ... A: Unfortunately, I need more info about the section size before I can work out the load carrying ... | |
| your advise to new graduate.... | 5/29/2004 |
| Q: MR.Arshad Khan ... I'm really thankful to the great job you are doing to civils and my quesition is ... A: I would suggest you try and get some site experience before you go too far into a design office ... | |
| how to improve the great wall of china | 5/27/2004 |
| Q: Let say you is a porfessional engineer and now you was in the ancient time at china. now you want to ... A: This is an interesting question, but I would like to know what you mean by "improve" the wall. For ... | |
| Plinth Walls | 5/26/2004 |
| Q: Thanx for ur reply but do u have any picture (diagram) which can clarify this concept cos i am not ... A: Sorry I cannot send a picture, but basically, if you assume that the top of foundation is say 1.0 m ... | |
| Plinth Walls | 5/25/2004 |
| Q: Can U plz tell me that what all are the plinth walls and what are thier functions also do u have ... A: Plinth walls are short walls that are usually integral with the foundations (usually strip footings) ... | |
| civil engineering | 5/20/2004 |
| Q: What is a perch and what is it used for? What is "breaking chain"? Gunter's chain is how many ... A: 1. As far as I know, a perch is a fish and can be used as a pet or as food! 2. A gunter's chain is ... | |
| structural engineering | 5/16/2004 |
| Q: Whrere on the internet can i find information about equivalent frame method of analysis of concrete ... A: If you mean the force method, then check this site: ... | |
| structural engineering | 5/13/2004 |
| Q: Where on the internet and in books can i find some literature to study about transfer of moments ... A: Yes, if you goo to Google and type "Moment Distribution", you will find lots of info. Here is one ... | |
| hello | 5/13/2004 |
| Q: hey, im chris robles, and i go to oakmont high school. we are doing a carrer project right now, and ... A: I am often asked such questions, so if you do not mind, i will cut and past a Q&A session which may ... | |
| Raft Foundations | 5/11/2004 |
| Q: Could you please explain how a raft foundation can be progressively stiffened, as the need arises ... A: I am not sure whether I have understood you correctly, but if a raft has say more loading in the ... | |
| Hydraulic cosiderations | 5/10/2004 |
| Q: My query is can u plz tell me what all are the hydraulic considerations while designing a bridge. ... A: The main considerations are of course hydraulic loading during flood conditions, as well as debris ... | |
| lifting heavy weight | 5/6/2004 |
| Q: How much weight can a helecopter lift and factors must a pilot consider when lifting larger ... A: This is not really my expertise, but I did some research for you and it appaers that a Sikorsky ... | |
| earthquake on an burried structure | 4/20/2004 |
| Q: I am Adel and I am working on a project in which we have a reinforced concrete box structure which ... A: You are correct in principle, but it also depends on what type of soil is backfilled and what the ... | |
| p-delta analysis | 4/8/2004 |
| Q: I have a question about p-delta analysis which etabs does . Etabs does this analysis only on frame ... A: I do not used ETABS, but if it is similar to STAAD, then what I would do is enclose the (shear wall ... | |
| Rcc eccentric footing design (isolated) | 4/8/2004 |
| Q: My question is how to design a spread footing which is located just near the boundry of the plot, ... A: Yes, this is a common problem and you need to design it as an eccentrically loaded pad footing, ... | |
| Weight Distrubution | 4/1/2004 |
| Q: I am wondering whether a scale actually measures the entire weight of an object. For example if I ... A: I regret to inform you that always weight down (action) equals wheel or axel loading (reaction)- ... | |
| Civil Engineering Software | 3/30/2004 |
| Q: I'm a Civil Engineering student from India and have a keen interest in computers as well. What ... A: The most useful software is Excel or other spreadsheet, and after that an analysis package like ... | |
| Culverts and Bridge | 3/26/2004 |
| Q: I just dont get ur sentence "and as it does not have a floor, it is called a bridge." do bridges ... A: . . Hi Adeel, If you consider a box culvert for say a river to pass through under a road, then the ... | |
| Culverts and Bridge | 3/25/2004 |
| Q: Can u plz tell me that what is the difference between a culvert and bridge, cos somebody told me ... A: Actually, both your advisors are correct. A culvert usually is either circular or rectangular in ... | |
| Building volumes | 3/24/2004 |
| Q: What is the interior volume of the Super Dome in New Orleans or any other very large enclosed ... A: . . Hi Mel, I don't know about the super dome, but the Millennium Dome in London has a volume of ... | |
| Application of differential equatios in ... | 3/22/2004 |
| Q: I research about application of differential equations in civil engineering.But i can not find ... A: . . Hi Behroz, I have checked out a few websites for you and the following gives numerous examples ... | |
| Safety culture | 3/19/2004 |
| Q: how to improve safety culture and does ISO guarntee that and why ? A: . . Hi Sam, This is a wide ranging subject, and difficult to do justice to through this medium. ... | |
| I AM A CLASS 12 STUDENT LIVING... | 3/19/2004 |
| Q: I AM A CLASS 12 STUDENT LIVING IN INDIA(CALCUTTA). I HAVE A CRAZE IN DESIGNING SKETCHES OF ... A: . . Hi Alokjuneja, Well, if you also like and are good at maths and physics, then would recommned ... | |
| Flexibility Method | 3/18/2004 |
| Q: Can you please provide a solution to the following problem: A propped cantilever beam with a span ... A: . . Hi Paul, Although I can work out the answers for you, it would be far better if you understood ... | |
| Partition wall | 3/14/2004 |
| Q: Thanx for your early response. The problem i want to solve out is that i want to construct a 4 1/2 ... A: . . Hi Adeel, I still do not know the quality of the existing floor or soil below, but assuming ... | |
| Partition wall | 3/13/2004 |
| Q: I just want to inquire that is it necessary to have the foundation of 4 1/2 inch brick wall also can ... A: . . Hi Adeel, Hi, This is a very difficult question to answer without knowing the design and ... | |
| doubt clearance ... | 3/6/2004 |
| Q: respected sir, could you state in detail by giving "points" :- 1)the functions ... A: The main difference between lintels and arches is that the former is straight and horizontal while ... | |
| Civil Related | 3/5/2004 |
| Q: Can you just clearly explain, How is particle board and plywood prepared ? ... A: Particle (or chip) board is fine thin fingers of wood which are wetted, and compressed with glue to ... | |
| Doubts ... | 3/5/2004 |
| Q: Define the following terms :- 1)Architrave 2)Venetian Blind 3)Sash 4)FanLight plz do ... A: This is really more to do with Architecture, but here are your answers: 1.The moulding around a ... | |
| Foundation Proposals | 3/4/2004 |
| Q: what would the best way for constructing mass filled pad foundations. I relaise there is the ... A: . . . Hi Martin, Thanks for further info, but this is still not enough for me to give you specific ... | |
| Foundation Proposals | 3/3/2004 |
| Q: what would the best way for constructing mass filled pad foundations. I relaise there is the ... A: It is difficult to give you a method statement without knowing full geotechnical details, etc. ... | |
| student advice (mumbai university) | 3/3/2004 |
| Q: i dont know if u can help me but anyway here it goes i am a sem 8 construction engg student in shah ... A: . . . Hi Nitin, I am really sorry to say that I have no idea what sem 7 and 8 mean in the Indian ... | |
| engineering | 2/26/2004 |
| Q: espected sir, I WILL BE COMPLETING MY CIVIL ENGINEERING THIS YEAR. WHAT TO DO NEXT? STRUCTURAL ... A: This is a difficult question for me to answer as I do not know enough of your personal ... | |
| Seismic | 2/19/2004 |
| Q: Client Project states "seismic" shall be Class 2b with acceleration factor of 0.2g; and, ... A: From what I can make out, both references to 0.2 g are the same thing. Zone 2b is a ... | |
| Engineering | 2/12/2004 |
| Q: Im sorry to bother you, but are u familiar with aerospace engineering, if not could you please ... A: I am sorry to say that this is not my field of expertise, nor do I have any contacts. However, if ... | |
| stresses & strains | 11/5/2003 |
| Q: I'm a 3rd year student of civil engineering here in Canada, I have sort of a stupid question, I am ... A: Not such a dumb question, really! Shear strength is what the member can take/resist, by it's ... | |
| What is a civil engineer? | 10/28/2003 |
| Q: Khan, I've heard great things about civil engineering, and I am now thinking about taking it as my ... A: Well, it's a very exciting and fullfilling career, but not as highly-paid as other professions such ... | |
| Bridges | 10/11/2003 |
| Q: I am making a portfolio on an excursion we had at school. It was about bridges. There are some ... A: Hi Well, I am sorry but I had only heard of no.1 and 2- perhaps because I live in Europe and ... | |
| Newtonian Fluids | 9/26/2003 |
| Q: Arshad Khan, Thank you for taking time to answer a very basic question. In the most basic terms you ... A: I am sorry but this is not within my expertise- it is in the oil exploration field. I ahd to do some ... | |
| Disasters and Construction | 9/2/2003 |
| Q: Can buildings be constructed to withstand earthquakes, floods, bombs, and other natural & human ... A: Yes, to a limited extent one can design against all these disasters, but it is a question of how ... | |
| concrete bridge repair | 6/7/2003 |
| Q: there is 35 year bridge has a lot of defects during carbonation and overload. should i replace the ... A: > > Hi Maha, This is very difficult to advise on without inspecting the structure myself. However, ... | |
| Civil engineering | 5/5/2003 |
| Q: 1)Whart services are required in a medium rise building & how are provisions made for there ... A: I have already answered 1, 2 and 4 as below, and now answer 3. Although I cannot give you detailed ... | |
| For my English Career Project. | 4/28/2003 |
| Q: 1. What do you like most about your job? 2. How did you become interested in your career? 3. Briefly ... A: Let me forward you the Q&A below which may answer many of your questions. This was in answer to ... | |
| Civil Eng. | 4/18/2003 |
| Q: I'm a college student who is checking ot the different fields of engineering. I was courious as to ... A: Let me forward you the Q&A below which may answer many of your questions. This was in answer to ... | |
| Reasons | 4/16/2003 |
| Q: Why do you do your job? A: That's a question I have not been asked before!! I do it because I love to be creative and find ... | |
| I'm currently studying civil... | 3/28/2003 |
| Q: I'm currently studying civil engineering and I'm trying to decide in which field to specialize. If ... A: Let me forward you the Q&A below which may answer many of your questions. This was in answer to ... | |
| Help! | 3/25/2003 |
| Q: my name is Margarita Cruz I'm a student at the University of Puerto Rico, and for my geography ... A: I am not an expert on canals, but from what I know, canalisation is man-made profiling of the river ... | |
| rcc design | 12/9/2002 |
| Q: my question is that what is the criteria to establish the positions of columns if we were provided ... A: Sorry for this late reply- I was travelling. 1. There is no limit to the space between columns, but ... | |
| shapes of materials | 11/25/2002 |
| Q: I did some experiments with folding paper and found that paper shaped into a cylinder with a ... A: Yes, your experiments are correct in principal, but the results can vary depending on the relative ... | |
| Job Question | 11/20/2002 |
| Q: What is it like to be an engineer (do you like it? (for school career assignment))? A: I have had similar questions before, so if you do not mind I will cut & paste a Q&A section which ... | |
| Mechanical testing of wood | 11/20/2002 |
| Q: and we recently had a wood lab where we tested wood for different strengths (tensile, cleavage, ... A: I am not an expert on timber design, but from first principles I would say that the reason the wood ... | |
| earth quack | 9/15/2002 |
| Q: for designing gruond water tank or reservoir with 6 m high R.C ,sould i consider the earthquack ... A: If you are in a high-risk seismic zone, then yes, reservoirs should be designed against earthquakes. ... | |
| Pattern developing | 9/11/2002 |
| Q: Hope you can help me, I am a plastic tech, basically welding plastic. Recently I was asked to ... A: I am sorry to say that this is not within my expertise, nor do I know where to refer you to. ... | |
| Geotechnia | 8/22/2002 |
| Q: Im a first semester Civil Engineering student in Mexico. I was just looking for some general, broad ... A: Geotechnical engineering is the application of soil mechanics to practical problems, such as slope ... | |
| Design | 8/12/2002 |
| Q: I have a 14 year old son who is very interested in building structures---especially bridges, ... A: There are several CAD software on the market, but I have not tried out the simple/basic ones. ... | |
| architecture | 7/25/2002 |
| Q: what would be the height of the interior of a three story building with a central fourth story ... A: Normally, the height of an office building would be 3-3.5 m per floor. However, for public assembly ... | |
| Load bearing | 5/27/2002 |
| Q: this may be a long shot but I wonder if you can help. I'm trying to find out if there's a ... A: Yes, you can either get a proper in-situ plate bearing test carried out by a suitable laboratory, or ... | |
| concrete | 9/25/2001 |
| Q: please explain the term carbonation in reference to reinforced concrete. A: Hi Carbonation is the affect of carbon dioxide in air neutralizing the alkalis in concrete over a ... | |
| Concrete | 9/23/2001 |
| Q: What is the difference as percent cost between a reinforced concrete slab and a normal coc. slab. ... A: Firstly I am not sure what a "coc" slab is. If this is just a concrete slab, or any other type of ... | |
| Pad foundations | 6/21/2001 |
| Q: What is the method of constructing an isolated reinforced concrete pad foundation? A: This appears to be a trick question, perhaps? If not, the answer is quite simple. You dig a hole in ... | |
| civil engineering | 5/18/2001 |
| Q: How many days do you work?Do I work with people or machines?What did you begin as?Then what where ... A: The answers are in BOLD below: How many days do you work? AVERAGE 5-6 A WEEK, 42 WEEKS A YEAR. Do I ... | |
| Wall Edge Footing | 4/24/2001 |
| Q: I have an edge wall footing(L shape) for a reinforced concrete wall. The wall is 6m in height above ... A: The only way this can be designed is to have a fairly long and thick base, so that it's centroid ... | |
| CONSTRUCTION CRANES | 4/5/2001 |
| Q: HOW ARE CONSTUCTION CRANES LIFTED TO THE TOP OF BUILDINGS UNDER CONSRTUCTION? ARE THE ANCHORED TO ... A: Most cranes for multistorey buildings are so-called self-climbing tower cranes. They are always ... | |
| General | 3/29/2001 |
| Q: Khan, Hello again and hope you're doing great. This time I don't have a specific question, it's a ... A: Your question is very difficult to answer as there are so many variables. Basically, whether one ... | |
| Follow-Up | 3/20/2001 |
| Q: Khan, Hello, I asked a Question regarding one-way shear transfer of wheel load on a solid slab, but ... A: Jarkas, I believe I have already answered your question yesterday by giving you the principles. ... | |
| Follow-Up | 3/20/2001 |
| Q: Khan, Hello, and thank you for your prompt response regarding our previous questions. I would like ... A: Jarkas, Your question is incomplete, but from what I can make out, here is the answer: If the ... | |
| Analysis | 3/18/2001 |
| Q: Khan, Good Day. I have two questions for you. 1. Suppose you have a non-linear simply supported ... A: Jarkas, Your second question is incomplete. Here is the answer to your first: If the two supports ... | |
| Reinforced Concrete Industrial Facilities Design load. | 3/10/2001 |
| Q: Khan, Good Day, I have two questions for you in the above mentioned subject. We have an industrial ... A: Jarkas, You have asked several questions, all of which are inter-related. If I have my units ... | |
Civil Engineering
Answers by Expert:
Arshad Khan
Top Expert on this page
Expertise
I can answer any questions to do with engineering consultancy and construction industry in East Africa and the Middle East, and specifically with the analysis and design of reinforced concrete structures. My particular expertise is in the aseismic design and optimisation of tall buildings.
Experience
Employment history: 35 years in Construction and consultancy in the UK, Kenya, Tanzania, Uganda, Ethiopia, Eritrea, South Africa, Somalia, Austria, Bahrain and the U.A.E.
Organizations
.Fellow of Institution of Structural Engineers (UK)
.Fellow of Institution of Civil Engineers(UK)
.Member of the Institution of Engineers, Kenya
.Registered Engineer, ERB, Kenya
.Chartered Engineer (UK)
Publications
•1984: International Conference on the Art and Practice of Structural Design, London
•1994: 3rd Int. Kerensky Conference in Structural Engineering, Singapore
•2008: International Conference on High-Rise Towers, Abu Dhabi
Education/Credentials
BSc in Building Engineering, University of Bath, UK
MSc in Concrete Structures and Technology, University of London.
Diploma of Imperial College, UK.
Awards and Honors
•Science Congress Special Award (for 2-seater Hovercraft - 1968)
•Institution of Civil Engineers Award for outstanding performance at Bath University (1975)
•Concrete Society Postgraduate study Bursary Award (1976)
•Consular Representative for British High Commission, Nairobi. (1995 to 1998)
•Examiner for Institution of Civil Engineers Professional Interviews, Nairobi. (1997 to 1998)
•Branch Representative in Vienna for PI assessment for Inst. of Struct. Engrs. (1999 to date)
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