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Civil Engineering/End Releases In ETABS

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Expert: - 3/31/2010


Question
Assalam o allaikum sir again , how r y ? hope you are fine inshALLAH , Sir i have one more question , If There is Simply Supported beams that is those beams which are resting on another beams not on columns , In etabs there is a option of end releases i.e moment releases , question is that whether in these simply supported beams i have to release the end moments or not ?

Answer
Hi Umar,

In practical terms it is not possible to construct such a junction without any moment transfer (unless you use pre-cast beams, with steel support bearings). So, how much moment you release depends on how the rebar detailing is done and whether you are prepared to accept some cracking at the top of the secondary beam due to rotation (in this case the top rebar must be the absolute minmum allowed by the codes).

If the secondary beam continues across the primary, then do not use any moment release. If not, then you can release between 10 to 80%, but again it also depends on relative stiffnesses of the supported/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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