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Civil Engineering/thermal pour strips

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Expert: - 10/27/2011


Question
dear sir,
good to have u back....hope u had a good and safe vacation..sir regarding the our strips u suggested around the shear walls, should the beams also be delayed with the slab?...as my system is a one way joist....and wat will be the placing(lap splices) of the reinforcement of the beams and slab in the pour strip....
2). wont any axial stresses be developed after setting of the early and delayed concrete???

Answer
Hi Kamran,

The pour strips should be no wider than 1 to 1.5m, so that the rebar lap splices happen within that zone. So for beams, it would be best to locate the strips within a zone 1/4 span to 1/2 span from the supports where shear is low.

If you keep the pour strips narrow, then the effects of shrinkage of the concrete poured later will be minimal. You will, of course, have to maintain the formwork in place for longer until the pour strips are fully cured.

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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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