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Civil Engineering/EATBS Slab Moments in Beams

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Expert: - 2/24/2010


Question

Result after mesh slab
Dear Sir,
Last time, I have asked you about mesh slabs which using membranes. And thank you very much for your answer. But after mesh slabs like that,I run analysis and it OK with no warning. I have the result bending moment in the beam, and I see the difference in 2 beam B1513 and B1670 (in my attached image), bending moment in B1513 is nearly 2 times bending moment in B1670, 2 beams are same dimension 800x600mm. I think with my plan, the bending moment in 2 beams is nearly same. Can you give me an advice?
Thank you very much!

Answer
Hi Khanh,

Your image is not clear enough to see the figures, but looking at the BM diagrams, I suspect the problem is to do with what I mentioned before- the load distribution from the small triangular bits of slab just above the beam 1670. Re-check this (maybe you need to merge the 3 separate elements into one) and you may find the results are more as expected.

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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