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Question
we are designing g+15 storey structure, the length of the structure is 119m, so expansion joints will be require at every 40m,since the structure is continuous what should be the size of the expansion joint? because there is a danger of pounding effect from the adjascent structure. What are the standards available reh=garding this and what should be the solution?
Hi Abhishek
Firstly, the 40-50m normal joint spacing can be increased to 75m and even 100m, if a proper thermal analysis is done and the structure is designed to resist the additional temperature stresses.
However, if a joint is required, then it only needs to be wide enough to avoid seismic pounding. For a 15 storey building, that width will be around 0.15 to 0.3m depending on the seismic zone and structural ductility/framing type.
For a joint of 0.15-0.3m width, you can incorporate sliding plates (like in bridges) and crushable nibs along the elevation/exterior, so that the building is weather-proof but will also obviate pounding problems.
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| Comment | Hi Arshad Thanks a ton for your quick reply, i would like to know that is any specific guideline or standard code that suggests the suggestions you made? or is that the standard practice? Also is any expansion joint detailing manual available? Kind Regards Abhishek | ||
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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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