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Civil Engineering/Span & PSF rating for 6" concrete on deck form and I-beams

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Expert: - 5/22/2008


Question
I need to know the maximum span 22 gauge 1.5C conform deck steel can
handle with a 6" total depth concrete pour. We will have 1/2 rebar on 16"
centers both ways. and can add wire mesh if needed. the suspended floor
structure is 19" long by 16'-8" wide. with 4 I beams along the length 5/16
thick 6" wide and 11 tall.

can you also tell me the maximum PSF load that it will accommodate?

Also, would it be good, or bad for us to add temporary supports under the
steel beams before the pour to minimize deflection.  My concern if we did
that is that , and then remove them a week later after the concrete has cured,
it might crack the concrete, do you have any recommendations concerning
this?

Answer
Hi Timothy,

I am not familiar with Conform decking (must be a US product), but you need to consult their span-load tables to answer your question. An example of that in the UK is available on this website:

http://www.rlsd.com/

As for propping, again the tables give guidance for this, but I would not be too worried about the concrete cracking.

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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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