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Dear Mr. Khan,
Hello, I asked a Question regarding one-way shear transfer of wheel load on a solid slab, but when I was checking the confirmation it looked as if the question was incomplete! If you got it all, please Ignore this one,if not however, I will re-write the question.
The question was basically, If you have a one-way simply supported solid slab subject to service wheel load=6 tons and if the wheel's effective contact area is 10cm x 15cm, slab span=6 m, and if the supporting edge is a 20 cm(in width) rectangular beam, please check if the slab is adequate for one-way shear strength(i.e.phiVc greater than or equal to Vu)Where phiVc= .85*2*Sq.Rootf'c*b*d. ( let f'c=3000 psi, and slab thickness=18 cm).
Please assume that the wheel load is very close to the support and almost all the load shall be transfered by the SLAB to that support.
Please show us all calculations and we would appreciate your recommendations in the design of such a slab.
Thank you and looking forward to hearing from you.
Hi Mr. Jarkas,
I believe I have already answered your question yesterday by giving you the principles. However, from the further data you have given me, a quick calculation shows that a 18 cm slab will not be sufficient for shear, and that you will need around 30 cm slab, with shear reinforcement. I am sorry, but due to liability reasons I cannot supply actual calculations - I hope you understand.
My suggestion would be to have a haunched slab, which starts off at say 30 to 35 cm depth and tapers back to 18cm some distance from the edge of the beam (say 0.5-0.6m). This way you will minimise the voulme of concrete and also dead weight.
I hope that helps.
Kind regards,
Arshad Khan
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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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