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Expert: - 5/24/2010


Question
Dear Sir,

Good day. During modelling a flat plate slab in etabs I found many of my edge beams near the bottom stories failed(become red)for DL+LL+Wind(factored) and also for envelop of load cases.
The things I considered a)rigid diaphragm for wind, b)All bottom supports hinged, c)no modifier at section properties of Beams(though it is a flat plate system), d)panel loads as per wall arrangement as superimposed DL.What possible cause will fail my structure. I shall waiting for your judgement.

Regards.

waliur rashid

Answer
Hi Waliur,

This is very difficult to answer without reviewing the model. One thing you should do is use semi-rigid diaphragm and also ensure that line constraints are invoked and auto-mesh is invoked for the slabs. Then re-run the model and see if that chages your results.

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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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