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Civil Engineering/CORE CUTTING IN RCC BEAM
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QUESTION: Good Morning Mr. Arshad Khan:
We were discussing this yesterday and I was releived with your prompt replies. There were some errors which I felt I should address to you once I went back to my residence yesterday.
1. The approximate measurements I could lay my hands on are as follows
Hole dia 2.75 inches and not cms
Length of the hole is 10 inches and not cms
Depth of the Beam is 24 inches
ANSWER: Hi,
About 3 inches diameter hole in a 24 inches deep beam should be no problem whatsoever, so long as you do not cut through any rebar and stay away from the supports- at least 75 to 100 inches away from the supports should be fine.
---------- FOLLOW-UP ----------
QUESTION: It is in the middle and more than 75 to 100 inches away from the supports, but it has cut through the centre re-bars and stirrup
Hi,
You should try and avoid cutting through sturrups, unless the hole is within the middle third span where shear is low. Also, avoid cutting central rebar, which is there for crack-control, but if it cannot be avoided cutting it should not affect structural integrity.
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Answers by Expert:
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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