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Civil Engineering/Eccentric Footing Design

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Expert: - 11/2/2011


Question
Eccentric FOOTING
Eccentric FOOTING  
Sir, Please find attached calc's for design of Eccentric footing. please guide me  wheather i am leading right direction or not?

Actually  max pressure  exceed the SBC of soil. shall i increase footing area to get rid of this Problem, or can i design for this max. Pressure?
please help me,

Thank's,
Sirisha

Answer
Hi Sirisha,

I am sorry but the text is not readable, but I note that your pressure sketch under the footing pad seems to be incorrect, as you should have higher pressure under the column.

If the pressure is only 10-15% higher than SBC, then you can accept it. However, if you want to improve the design, you can make the base trapozoidal in shape on plan, with the wider section under the column. You can also try and balance the eccentric moment by incorporating a ground (strap) beam from the eccentric pad to another one nearby?

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Arshad Khan

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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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