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Civil Engineering/ETABS MODEL.. Different Questions

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Expert: - 3/18/2010


Question
Dear Arshad Khan,
Please review the etabs model . THe link is
http://cid-60157d8f9414c461.skydrive.live.com/self.aspx/Public/Model.zip

Its model of a small two story factory . Column sizes are 15x15 and panel size 20x25. Strange thing is the amount of reinforcement coming in the columns. moreover the columns of 1st story are giving more reinforcement than lower floor columns on dead + live case. I believe results are very strange. Area of steel for some columns is more than 12in^2.
Need Guidance.

Thanks in advance
Best Regards
Muhammad Umar

Answer
Hi Umar,

I could not open the zipped folder (says it is empty), but in any case your strange results may be due to:

1. The upper columns having much higher moments than lower ones. (could be bi-axial moments).
2. The size of the columns looks rather small- I normally do not use RC columns smaller than 175 or 200mm, due to problems with rebar congestion, especially at junctions with beams and also due to durability/cover requirements.

Civil Engineering

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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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