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Rationale for Determining Design Wind Velocities
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.
Rationale for Determining Design Wind Velocities
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.
Rationale for Determining Design Wind Velocities
Davenport, A. G. (author)
Transactions of the American Society of Civil Engineers ; 126 ; 184-213
2021-01-01
301961-01-01 pages
Article (Journal)
Electronic Resource
Unknown
Rationale for determining design wind velocities
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