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Civil Engineering/Maximum Distance Between Concrete Steel Post

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Expert: - 1/6/2008


Question
What is the Maximum Distance Between Concrete Steel Post and what size of reenforced steel bar should I use? We have just built a 3 floor concrete building using 16mm and 20mm rebar, 8 bars in concrete posts and 6 bars in beams with 4.4 meter beams between between posts and 1.2 meter beam extensions.

Now we want to build an extension with existing slabs and beams having steel extensions ready. here's  my MAIN QUESTION;

IF I extend the distance between posts to 4. 8 or 5 meters what SIZE of steel bars and how many in each beam do I need to use for structural safety taking in consideration in a few years I might want to extend the building up to 5 or 6 floors?

Answer
Hi Bill,

Your question is confusing- are you talking about concrete posts or steel posts? In any case, I cannot give design solutions over this forum due to liability reasons and in this case you need to give a lot more information to a structural engineer in your area who would be best placed to advise you properly. I hope you understand... and...

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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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