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# Civil Engineering/wind angles

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Question
Sir,

Please explain what is the meaning of wind at 0 degrees angle and 90 degrees angle , as per my knowledge i know the following,

1. wind normal to ridge (this will be applied to the structure in both +ve and -ve directions for example in +x direction and -x direction in STAAD)
2.wind parallel to ridge (this will be applied to the structure in both +ve and -ve directions for example in +Z direction and -Z direction in STAAD)
then please explain which would be called as wind at 0 degrees and wind 90 degrees.
please also explain the meanings of wind at 0 degree angle and 90 degree angle in context with warehouse , normal building and a pole.

Answer
hi Arsalan,

Yes, basically 0 degrees is in +ve X direction and 90 degrees in +Y direction (if Z is vertical). This applies to all types of structures, such as you have listed. Of course you can also have wind at 15, 30, 45, etc degrees. (+ve and -ve)

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#### Arshad Khan

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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.

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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.

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 •2013: IEK International Conference, Kisumu, Kenya

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 2010)

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