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Question
hi
my question is that what is the criteria to establish the positions of columns if we were provided with just the space over which the structure is to be built i mean is there any limitations to the space between two columns.
secondly for the excavation to be performed for column footing should it be started just below the ground level or it should be started below F.F.L (finish floor level).
also while designing a shop i encounter a problem in which one wall is in common between the slab i have to built for the shop and the other of the previously build shop so wat method should i adopt.
1. should i expose the steel of slab of previously made shop and tie it with the slab of the shop's slab i made and design it as continuos slab.
2. i make another wall and rest the slab on it as a discontinuos end.
i will be really grateful to you if u answer all my questions.
thanx
Hi Adeel,
Sorry for this late reply- I was travelling.
1. There is no limit to the space between columns, but the cost as well as structural depth of beams goes up with larger spans. After a certain length (say 15-20m), RC beams become uneconomical and pre-stressing should be considered.
2. I do not quite understand the question, but basically the excavation for the footing should be at least 1m deep, or below the ground frost level, whichever is deeper. Of course, if you encounter bedrock, then you can place the footing at shallower depth.
3. The question about the wall is difficult to answer without looking at it personally, but it would be safer to adopt the second option that you have mentioned.
I hope this helps!
Kind regards,
Arshad
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Answers by Expert:
Arshad Khan
Expertise
I can answer any questions to do with civil and structural 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: 36 years in Construction and consultancy in the UK, Kenya, Tanzania, Uganda, Ethiopia, Eritrea, South Africa, Somalia, Zambia, Austria, Bahrain, Kuwait, Doha 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
.Member of the Architectural Association of Kenya (Engineers Chapter)
.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, 1st Class Hons, 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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