Rationale for Determining Design Wind Velocities
Publication: Transactions of the American Society of Civil Engineers
Volume 126, Issue 2
Abstract
This paper first justifies the use of the ”extreme wind velocity averaged over a mile or minute“ as a ”basic design wind velocity” in preference to absolute peak velocities which cannot be considered independently of the size of the structure, and of the dynamic response of anemometer, structure, and structural materials.
An attempt is, then, made to show from published records that reasonably systematic relationships exist between the ground roughness (as characterized by such general qualitative descriptions as “city,” “treed countryside,” and “open prairie”) and both the magnitude of the extreme wind velocities near the ground and its rate of increase with height. This allows approximate estimates of the ratio of surface velocity to gradient velocity to be made. By these means, independent sets of anemometer records taken at locations differing in surface roughness can be compared.
By further introducing the extreme value theory a method is suggested where by these sets of records may be numerically related taking into account the relative ground roughness, the number of years of record, the quality and consistency of the records, and the height of the anemometer. This process assists in minimizing the systematic errors which are often introduced into individual anemometer records.
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Published In
Transactions of the American Society of Civil Engineers
Volume 126 • Issue 2 • January 1961
Pages: 184 - 213
Copyright
© 1961 American Society of Civil Engineers.
History
Published in print: Jan 1961
Published online: Feb 10, 2021
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