Civil Engineering/Structural Beam

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Expert: - 6/24/2009


Question
Hi Arshad,..My name is Zairul..how is the better way to joint the new concrete stump(using for membrane structure tie back) into the existing beam?
for ur info..existing beam have a 3 layers 18y32(beam size 1750mmx610mm) rebar on top..tq..ur prompt answer much appreciated..

Answer
Hi Zairul,

As membrane structures have high tension forces, you have 2 options:

1. Use one or a pair of steel plates that are bolted into the side of the beam- with Hilti or similar anchor bolts. Ensure the bolts are deep enough and that they are not within just the concrete cover to the rebar, as that is very weak.

2. Drill and grout in starter bars (using epoxy adhesive), so that you can cast in the stump RC beam.

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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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