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Expert: - 6/6/2009


Question
Dear Sir,
1.In safe while designing raft slab Is any provision for entering soil bearing capacity rather than subgrade modulus?
2.While modelling slab in etaabs shell or plate should be selected? I am always using shell  is it right?what cases should be while considering plate?
3.And while exporting slab from etaabs to safe and run analysis ,safe is always design it as flat slab has column strips and middle strips...If I want to design as 2way slab or one way slab,how we can do it?

Answer
Hi Ravi,

1. No, because the capacity has no relationship to soil stiffness as far as SAFE is concerned.

2. Shell is OK for most cases as they take account of out-of-plane stiffness, while plates do not. So plates could be used for elements forming a core wall, for example. All such info is available in the Help menu for ETABS- go to Area Objects>Wall/Slab Sections.

3.You should be bale to export the slab including any supporting beams.

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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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