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Civil Engineering/etabs storey drift

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QUESTION: Dear Sir,
Thanks so much for your earlier advice.While doing analysis for my G+10+R ,I am getting the max storey drift in the 'show storey response plot'as the picture attached And showing some unusual values .Can I go ahead with this model? however my all member design is satisfactory.Appreciate for your valuable advice.what I can do in this case if need to be done any rectification.  Thanks.

ANSWER: Hi Ravi,

Yes, it seems like you have a soft story around 3rd or 4th level, but so long as the maximum values are below the codified limits you should be OK.

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QUESTION: Sir,Thanks so much.The case is I'm getting drift like 1.24E+10 in the 3rd and 4th storeys and 6.21E+09 in the above storeys as well.Is this  very unusual for a G+10+R building..how can I make it to a permissible limit...Appreciate for your valuable advice...Thanks

Answer
Hi Ravi,

I could not view your images very well, but there must be a misunderstanding as inter-story drifts are unitless and are just fractions Def/h, so they should be less than 1.00

In any case without interrogating your model (or viewing plans/sections) I cannot advise any further about how to make it stiffer.

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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: 40 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 •2013: IEK International Conference, Kisumu, Kenya

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 2010)

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