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Civil Engineering/deflection results in staadpro

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Expert: - 5/6/2009


Question
QUESTION: Dear Sir,
do i have to check global or local deflection for the members. please help!



ANSWER: Hi Anees,

This depends on the nature of the structure and what you are trying to check. For example, for a high rise, you need to check global lateral deflections for the columns/storeys and for the beams you need to check local member deflections, or global deflections minus local deflections of the nodes either side of the member in question.

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

QUESTION: Dear sir,
Thank you very much for the prompt reply. i have modelled a space floor for a villa on staad pro, with beams and fload applied on it with load combinations as usual. normally, i used to check local deflection in y direction for beams, but today when i checked the global deflection gy , it is much more than the local gy deflection. now can i use the local deflection or global gy less local gy for beams, with the above mentioned model. thank you sir!

Answer
Hi Anees,

In your case, the overall deflection of the slabs is a critical servicibility criterion (for example cracking of partition walls, etc), so I would consider the overall global deflection without deducting deflection of the supporting beams.

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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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