Civil Engineering/diaphragm wall

Advertisement

Expert: - 4/5/2011


Question
Dear Sir,

I read in the document that 20% of allowable bond stress is to be deducted. So could you show me the code that admits rebar strength is not affected.

Best regards

Dear Sir,
how does the strength of reinforcement change when we calculate diaphragm wall (casted in bentonite)?

Regards.

Following is the reason:

Hi Tung,

I do not quite understand your question, but rebar strength is not affected- maybe the concrete strength will need to be adjusted for the conditions under bentonite.

Answer
Hi Tung,

Yes, so that is exactly what I said before- the rebar strength is not affected, but the bond strength is reduced, as that depends on the quality of the concrete, not the rebar. So this must be because of the uncertainty of the degree of compaction or quality of concrete when cast with bentonite- as it cannot be easily inspected as in the case of superstructure concrete.

Civil Engineering

All Answers

Answers by Expert:

Ask Experts

Volunteer

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)

©2012 About.com, a part of The New York Times Company. All rights reserved.