You are here:

Civil Engineering/Combined Footing and Raft analysis


salam sir
i like your answering technique.
sir kindly give me link for analysing more than two columns supported strip footing and raft footing from where we can easily calculate

Hi Zain,

Please see this website for a strip foundation with 2 columns- you can use similar principles for one with 3 or more columns.

For the raft the same principle applies, but it is more complicated as the raft behaves like an up-side down flat slab, with point loads from the columns. However, just designing it as an up-side down flat slab ignores the soil-structure interaction, so in order to get a more accurate solution you need to do a 3-D FEA using appropriate software, such as STAAD-Pro. the simple (aproximate) design is as shown in this website:

Civil Engineering

All Answers

Answers by Expert:

Ask Experts


Arshad Khan


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.


Employment history: 40 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.

.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)

•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 •2013: IEK International Conference, Kisumu, Kenya

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 2010)

©2017 All rights reserved.