Accession Number : AD0675580

Title :   RATIONALE FOR DETERMINING DESIGN WIND VELOCITIES,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF BUILDING RESEARCH

Personal Author(s) : Davenport,A. G.

Report Date : 1960

Pagination or Media Count : 30

Abstract : The 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 and both the magnitude of the extreme wind velocities near the ground and its rate of increase with height. A method is suggested whereby 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. Some published extreme-value data for the British Isles are analyzed according to the described procedure and an example is given illustrating how design wind velocities can be determined in a manner which takes into account the important influence of surface roughness, the variability of useful life of different structures, and the risks involved if the wind velocity is exceeded.

Descriptors :   (*WIND, MEASUREMENT), (*STRUCTURES, WIND), ANEMOMETERS, LOADS(FORCES), SAFETY, ECONOMICS, CORRELATION TECHNIQUES, SURFACE ROUGHNESS, TERRAIN, BUILDINGS, CONSTRUCTION, CANADA

Subject Categories : Meteorology
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE