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Civil Engineering/Slender column design

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Expert: - 8/27/2010


Question
sir, i want to construct a  rcc column 40feet high to sport the projection of slab over external steps of main entry to masque please guide me with design details

Answer
Hi Masoodi,

For a column that tall, you will need to be carful about slenderness and buckling (unless the load is very low or you can brace the column at half-height). I cannot do the actual design for you over this forum, but the design procedure is as per details given in this website:

http://www.civl.port.ac.uk/rcc2000/

From here downlaod the spreadsheets RCC 51, RCC 52 and RCC 53, for designing columns.

If your column is slender (height/width more than 15), you will need to design for the additional moments due to slenderness. In other words, your column needs to be 2.7 ft wide to design as stocky (non-slender), otherwise you can make it smaller in section, say 1.5 ft and design it as slender.

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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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