Abstract
Natural wind-induced vibrations of structural members have been the source of fatigue damage to offshore platforms during fabrication and transportation and to flarebooms during in-service conditions. It is shown that natural unsteady fluctuations in the mean wind speed typically prevent vortex-excited vibrations from reaching steady state amplitudes. A probabilistic model is proposed in which the duration of visit by the mean wind speed is expressed in terms of the probability density function and spectrum of the wind speed. The vibration response amplitude and rate of fatigue damage are predicted in terms of the ratio of the duration of visit of the mean wind speed in the critical velocity interval to the rise time of the vibration response. A worked example is presented to illustrate the proposed probabilistic model.
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