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Civil Engineering/Eccentric footing Design

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Expert: - 1/22/2011


Question
How to design an eccentric footing?

Answer
Hi Pal,

I have answered this before, if you had browsed my previous Q&A:

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Question: Can i have image %26 calculation sheet with example for eccentric footings. I want complete calculation of eccentric footing step by step also with the images.

Answer:

I cannot send you an image, but the following will help you.

This is a common problem for say a boundary column and you need to design it as an eccentrically loaded pad footing, which will have high pressure at one and (near boundary) and low to zero pressure at the other end. In order to avoid tension, you may have to extend the footing with a ground-tie beam to either another pad further away from the boundary, or else to a counterweight pad say 1-2 meters from the column.

Try this link, which will give you some guidance of how to design eccentric footing:


http://www.engineering-international.com/EccentricFooting.xls

or

http://www.engineering-international.com and then go to eccentric footing.

Also:

Check out the following for guidance:

http://en.allexperts.com/q/Civil-Engineering-1357/Rcc-eccentric-footing-design.h...

http://en.allexperts.com/q/Civil-Engineering-1357/eccentric-footing.htm

and this one actually gives you all the formulae as well:

http://www.engs-comp.com/hansen/index.shtml  

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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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