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Civil Engineering/Column Design - Etabs

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Expert: - 3/12/2009


Question
QUESTION: Hi,
If we design column using etabs it shows overstressed while at the same time if we cross checked same column in PCACol than column has adequate capacity. Kindly explain, If i am correct, what can be the reasons of overstressing using ETABS. Your early reply will be highly appreciated. Thanks and Regards

ANSWER: Hi Agha,

Before I can answer this, can you please tell me where you derive the inputs (axial load and moments) when designing in PCACol

---------- FOLLOW-UP ----------

QUESTION: Thanks for your prompt response. yes the combination used for the design of column in ETABS is same as i used in the design of column using PCACol.

Answer
Hi Agha,

In that case, the only reason I can imagine for the different results is that maybe you got the signs/directions for the end-moments wrong when inputting to PCACol?

If that is not the case, I suggest you send both models to CSI support and they will be able to advise.

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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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