Civil Engineering/box culvert

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Expert: - 9/17/2009


Question
dear Arshad Khan ,
i am trying to analysis the twin box culvert that is subjected to wheel loads.I want to know how to analysis.please give me example.
thank you

Answer
Hi Sashen,

This is normally designed on basis of an influence line (moving loads, like for bridges), but you can simplify the design by applying earth pressures and also point (wheel/axel) loads in order to impose maximum shear (near supports) and maximum moments (near mid-span of each cell). This applies to the roof. For the side walls, you will get vertical compression, moment distribution from the roof, as well as earth/overburden pressure. For the floor, you will mainly get UDL foundations reaction, with concentrated loads at wall positions. Reynolds has a procedure for the analysis and design, and also here:

http://www.structsource.com/drainage/types/culvert.htm

You will find typical detailing at this location:

www.cretexnorth.com/Catalog/ercp/PDF/NDCPdcwcs.pdf

and some suggested design criteria:

http://www.sddot.com/pe/bridge/docs/plansprep/PrecastBoxCulvert.doc

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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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