Civil Engineering/vertical hilty

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Expert: - 10/1/2008


Question
i had designed the shear wall ,but by mistake at site they have casted the shear wall with some vertical bars missing, now i want the 20 dia bar in 300 mm thick rcc wall , hilty , is it possible that 600 mm hilty can be done.if yes pl give specification

Answer
Hi Chandan,

Depending on whether the bars are subjected to tension or compression, there will be different requirements- e.g. for compression bars you need to ensure that the restrain links are also present, and this you cannot do by merely drilling and grouting in the bars.

In theory drilling and grouting is of course possible, but you may find it easier to cut down the wall and insert the bars. Or alternativly, if space allows, you could cast a layer of additional concrete say 100mm thick atound the 300mm wall (after exposing the aggregate and using a bonding agent) and insert additional bars within this- again taking care of lateral restraint requirements.

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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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