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Abstract
The accuracy of the simplified gust factor approach to the determination of wind loads is examined. An expression for the gust factor is derived that treats the scale of turbulence, mode shape of vibration, and parameters defining the vertical and crosswind cospectra as variables. The method formulated in this paper differs from previous methods primarily in the size reduction factor and in the form of the spectrum of velocity fluctuations. Predicted values of gust factors are compared with those observed on eight different aeroelastic models tested in a boundary layer wind tunnel. The gust factor relates only to overall loads in the mean wind direction. Where basic data are well-defined, the ratio of expected peak values of wind-induced stress or deflection to their average values can be predicted to an accuracy of typically 5 to 10 percent.
The accuracy of the simplified gust factor approach to the determination of wind loads is examined. An expression for the gust factor is derived that treats the scale of turbulence, mode shape of vibration, and parameters defining the vertical and crosswind cospectra as variables. The method formulated in this paper differs from previous methods primarily in the size reduction factor and in the form of the spectrum of velocity fluctuations. Predicted values of gust factors are compared with those observed on eight different aeroelastic models tested in a boundary layer wind tunnel. The gust factor relates only to overall loads in the mean wind direction. Where basic data are well-defined, the ratio of expected peak values of wind-induced stress or deflection to their average values can be predicted to an accuracy of typically 5 to 10 percent.
Date
11/1970
11/1970
Author(s)
Barry Vickery
Barry Vickery
Page(s)
93-104
93-104
Keyword(s)
dynamics; gust factor; mode shape; probability theory; wind loads
dynamics; gust factor; mode shape; probability theory; wind loads