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Civil Engineering/Subgarde Reaction in safe

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Expert: - 2/12/2009


Question
Dear Arshad Khan!

I want to know that If there is a relationship between modulus of subgrade reaction and bearing capcity..???

For a given bearing capcity how can I find the value of Modulus of subgrade reaction to use in Safe???

I have heard that bearing capcity can be converted into modulus of sub grade reaction by

Bearing Capcity x 12 x 3 = Modulus of subgrade reaction

Where BC in KSF

Is the above equation right

Answer
Hi Umar,

I am afraid it is not as simple as that, becuase you need to take into account the load-settlement relationship. These tow websites will give you the procedures:

ftp://ftp.dot.state.tx.us/pub/txdot-info/cst/TMS/100-E_series/pdfs/soi125.pdf

http://www.eng-tips.com/viewthread.cfm?qid=118633

Also, some soils/foundations textbooks give approximate values for different types of soils, so that may be of help. Suffice to say that this is not an exact science, so you should do upperbound and lowerbound analyses to capture the envelope moments, shears, etc.

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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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