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Civil Engineering/Deck Slab - Steel

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Expert: - 2/8/2012


Question
Salaam Alaikum

Dear Sir,

I have a doubt regarding Deck Slab on Steel Deck... I want to know whether the Load is entirely taken by the steel deck or is there a composite action of concrete and steel deck ??

Please advice some material by reading which I can further understand the action of this type of construction.

Answer
Hi Muzaffer,

This depends on whether you use proprietary profiled sheet decking (such as Comflor- see http://www.steeldeckinguk.com/comflor80.html) or just normal metal decking without any bonding ribs (such as roofing sheets). If it is the latter, then there will be no composite action for the design of the slab, but if studs are incorporated into the supporting steel beams, then these beams can be designed as composite with the concrete slab (for span/sagging moments only).

If you are using proprietary decking, then you will also get composite action for the design of the slab, but only when the concrete has hardened. During casting and for 7 days thereafter, there will be no composite action, so you may need to provide temporary supports under the decking to avoid over-stress or excessive deflection of the decking.

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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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