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Civil Engineering/Moment magnification factor from ETABS

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Expert: - 10/2/2009


Question
Dear Sir,

How can I get the value of moment magnification factor from ETABS? If I do P-delta analysis does it give the magnified moments?
If there is not any lateral load then is it necessary to magnify the moments? and If there is wind load, in ETABS we define two loads. One in X-direction & another in Y direction. For P-delta analysis which direction wind load should be assigned in the load combination?

with best regards,
Dilruba
Department of Civil Engineering
Bangladesh University of Engineering & Technology.

Answer
Hi Dilruba,

Yes, ETABS does calculate magnification factors and includes these in the output. This applies equally to slender columns with or without p-delta analysis.

Yes, if you have slender columns then moment magnification is relevant. For pdelta analysis, ETABS will apply to both X and Y directions.

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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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