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Civil Engineering/Braced & Unbraced Column in RCC Structure

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Expert: - 6/29/2009


Question
Mr. Arshad,

Pleas see below my query:

If a 400x400 RCC column is connected to 350x600 deep beams in both planes and building is a single storey with max height of 6m and 200 mm thick roof slab is also there.

1.In view of above information  can we considered this column as a braced column in design.
2.Is block can be consider as a bracing element for column?
3.Please guide me briefly about the basic concept of braced & unbraced conditions for column.

thanks & Regards.
Shah.

Answer
Hi Shahzan,

1. Yes, it can be considered braced against rotation, but not sway unless the whole building is braced by core walls or shear walls or X-bracing.

2. Yes, if the in-fill blockwall is build tightly against the columns and beams, without door or window openings, then this can act as a bracing panel.

3. This info is given in BS8110 or in BS 5950 or other equivalent standards.

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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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