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Civil Engineering/Prestressed Concrete

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Expert: - 6/13/2009


Question
Dear Sir,
1.How we can design a post tensioned slab .what are the criteria in design to be followed?
2.is it possible to design post tensioned slab in safe?
thanx so much

Answer
Hi Ravi,

Post-tensioning is simply to apply pre-stress after casting & curing concrete, and prestressed concrete principles are simple- using very high yield tendons to those areas of beams or slabs that have tension zones, so that concrete remains in compression.

The subject is too long to explain in detail here, but you can study it one line at:

http://books.google.com/books?id=yr7nmajB7XMC&pg=PA25&lpg=PA25&dq=cube+and+cylin...


The latest version of SAFE (v12) does include design for prestressed concrete, as do other software such as RAPT, ADAPT and PROKON.

However, before you start using software, you should always understand the principles of how to analyse and design by hand calculations.

Civil Engineering

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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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