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Civil Engineering/Column Lateral Ties Design

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Expert: - 4/6/2009


Question
Hi, Arshad,
Actually i m working on the industrial project, so i always come acroos big columns. So i need to ask that if my column size is 1500x2300mm reinforced with 56 nos of 25mm dia bars and column length is 12 mts., then how to design lateral ties. Because as per BS, taking its arrangement of tying all the bars leads me to uneconomy as well there is not much shear force acting on it.

Answer
Hi Amit,

You cannot cut corners in this regards, as the ties are not there for shear, but mainly as restaints to the compression vertical rebar so that they do not buckle and also to give the column ductility.

You can reduce the number of bars and the vertical spacing of the links by using a larger diameter of column rebar- T32 instead of T25?

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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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