Civil Engineering/Flat Slab

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Expert: - 5/12/2009


Question
Dear Sir,
Due to restricted hieght, I am asked to Design a Flat slab System. I have never designed it before.Checked out some books but got very little help.
Dear sir please help me
1.I want to know how would I divide the panels since I dont have a uniform square spacing of columns ?

2.What about the wall load , Should I take the complete   Wall weight(kN) and convert to area wight (kN/Sq.M) over the flat slab.

3.Should I design each panel seperately or design a panel  with maximum dimensions and use it for all the panels.

thankyou sir

Answer
Hi Syed,

This is complicated if you do not have a regular grid of supports and the only way is to use a 3-D analysis program like SAFE.

Wall loads can be spread over a strip of say 1-1.5m wide and applied as a UDL.

All panels need to be designed according to the internal forces deteremined by the analysis. Particular care is required for punching shear around columns and for deflection, particularly of end-spans.

These sites give some guidance:

http://projects.bre.co.uk/ConDiv/concrete%20frame/Flat_Slabs_4pp_Web_pages.PDF

http://www.civl.port.ac.uk/rcc2000/

http://www.ketchum.org/-milo/slab1.html

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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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