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Question
Dear Sir
I am Designing a model for a hotel located in dubai, and i know that ETABS has the defults regarding the seismic load as if its in california, what items and standards do i need to change in order to make the model compatible for seimic area 2A according to IBC. because it giving that some memebers are failing due to torsion plus shear stress and i know that is due to the over conservative design requirment for california. so i want my model to be more tolarant. cause along with the beams i have the shear walls are failing and the building period is 3.2 second which is too much for a 50 m high and i dont know honestly how to decrease it ... best regards
Kamal Bairaqdar
Senior civil Engineer student
Hi Kamal,
Using the default UBC (not IBC)loading with zone 2A is fine for Dubai- it is not over conservative. You need to use the correct parameters for the soil conditions and the R factor, depending on the structural system of your building and you should also use stiffness modifiers as per UBC.
You are right that for a 50m (or 12-13 story) building the 1st mode period should be around 1.2 to 1.4 seconds, so this meams that your building is too flexible and needs to be made stiffer (more shear walls, or using a dual system with MRF?)
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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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