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Civil Engineering/Wind Loading on Lattice Structure

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Expert: - 12/17/2011


Question
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Dear Sir,

I have got a structure to be verified, this structure is equipment support and a lattice structure. I have modelled the structure in staad and starteed applying loads as per attached requirement.

I dont understand the application of Wind Load on the Lattice Structure. They have given a Equation based on "A0 i.e. area enclosed by the Boundary of the Support structure normal to thte wind Direction".

Please advice how wind loading is applied to the structure..

Answer
Hi Syed,

Wind loading on a lattice structure is complicated due to local turbulance, vortices, suction, etc caused at the downwind side of the steel members, so sometimes it is simpler to assume conservativel that one face of the tower is subjected to the full wind load, assuming that it is solid (i.e. non-permeable). I would suggest you try that first and if the structure is over-loaded then you can consider refining down the wind loading, by applying linearly to the vertical and inclined steel members (not forgetting positive and negative/suction forces).

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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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