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Question
I am a student civil engineer from Kenya.
am made to design a piled raft foundation for 4 no. LP Gas horizontally mounded tanks 6.5m dia. by 100 m long and 6774 tons capacity.hey are supposed to be buried in silty clayey soil of 100kpa bearing capacity.What would be the slab thickness and size and depth of piles (friction type)and their reinforcements.please give the grid spacing of the piles.
Thanks in advance.
Timothy.
Jambo, Timothy,
If I have interpreted your figures correctly, each tank will weigh around 70,000 kN, so if you try out a base of say 10m width by 110m long by say 1.5m thick, that will weigh around 26,000 kN, making it a total of 96,000 kN. So the applied UDL pressure on the soil will be 96,000 divided by 110x10 = 87 kpa. Therefore you do not need any piles, unless these are require to control overall or differential settlement.
In any case, I regret that without ground investigation information I cannot suggest what pile capacites you could expect.
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| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | thanks arshad, thou i did not clarify that the tanks are in a single pad separated by 1.5m and completly covered in soil up to 1m.the ground water level is about 3-7m the area is next to the sea.but i do appreciate your answer. | ||
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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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