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Civil Engineering/Two Way Continuous Slab

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Expert: - 2/24/2010


Question
Hi Arshad,i want to know that in two way continuous slab for extra top reinforcement over support,for 1st span say S1 the short and long bars are of dia 10mm while for 2nd span say S2 the short and long bars are of dia 12mm.so which dia steel will we use as extra top bars over supports for both spans and please elobrate it in detail with reasons.thanx alot.Regards...Tariq Kamal

Answer
Hi Tariq,

This is a difficult question to answer as it depends on how the slabs have been analysed and what relative spans and moments you have. Normally, if S1 equals S2, and S1 is an end-span and S2 is a middle span, then the moments and rebar in S1 should be greater than in S2.

I would look at the negative (hogging) moments at the supports and determine the rebar accordingly. If you apply moment re-distribution, you can reduce the amount of support top rebar.

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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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