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Civil Engineering/reinforcement details when beam cross each other

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Expert: - 11/24/2009


Question
four columns in rectangle say A,B,C,D The center to center distance  A to B is 6m & B to c is 10m beam rest on A to B is 350 x900 same as c to d & one beam is cross in mid span of beam in bet A to c & c to d. so please tell rebar position at intersection of beam?

Answer
Hi Ibrahim,

You have not indicated whether the beams terminate at A,B,C, and D or whether they are continuous. If they terminate, the detailing depends on whether you have designed the beams as simply supported or fixed, so that they form a sort of portal frame with the columns. The rebar detailing also depends on the sizes of the columns. In general, the rebar for the 6m span beams should sit in the second layers, between the outer layers of the 9m beam rebar.

Check out this website for typical rebar detailing rules, and it also shows beam cross-over detailing:

www.sefindia.org/?q=system/files/REREINDETAILING.ppt

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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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