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Civil Engineering/Expansion joints in Water retaining structures
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Question
Sir,
Do we need to insist expansion joints in walls or base slab for an RCC Ground water reservoir of internal dimensions of 24m x 24m x 5 m deep with wall thickness of 0.45 m at the bottom and .30m at the top. Base slab thickness is .45m and roof slab thickness of 200mm
Hi Narasinga,
If the design takes care of all stresses caused due to temperature variations, and if you take care during construction (to avoid early-age shrinkage cracking), then there is no need to have any movement joints in a structure of this size. The roof slab will be subject to most temperature variations, so ensure you have adequate additional rebar (especially in the corners), to cater for the temperature stresses.
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| Comment | Thanks for very quick and clear response.I pay my sincere thanks to the contributors, Mr.Arshad Khan and the website, having this kind of usufull Knowledge sharing. Thanks and regards, Narasinga Rao | ||
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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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