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Civil Engineering/Main rebar of column cutted

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Expert: - 12/23/2008


Question
QUESTION: Dear, the main bar for the column of 4th floor (last floor) cutted by MEP people, please give me the proper solution.

ANSWER: Hi Nadeem,

You have not given me enough info to advise properly, but if the bar is critical to the structural stability what you can do is cut out the concrete sufficiently (after propping the beams/slabs) so that you can either lap an extra bar, or weld on a splice bar. Make sure your column links go around the new splice bar.

---------- FOLLOW-UP ----------

QUESTION: Dear, the 4th floor (last floor) beams as well as slab and parapet wall already casted. please let me know if you required more information. Thanks.

Answer
Nadeem,

My earlier answer still applies- you need to do a stress check to see if the cut rebar is still required (for structural stability (due to possible over-design)- for example if there are 8 bars and only one is cut and it's not a  corner one, you may find that there is no need to do a repair/splice?

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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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