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Abstract
AbstractA model is proposed to represent nonstationary fluctuating winds based on the concept of instantaneous power spectrum representation and amplitude modulation to model the fluctuating winds with time-varying mean wind speed. This results in the nonstationary fluctuating winds at a point to be characterized by a power spectral density function with a frequency modulation; it is proposed and shown that the frequency modulation can be assigned based on a time transformation defined through a dimensionless distance traveled by the winds that is calculated using the mean wind speed. In essence, nonstationary fluctuating winds are obtained by mapping the stationary fluctuating winds through a nonlinear time transformation and by applying an amplitude modulation. The proposed model is employed to simulate nonstationary winds for parametric investigation of the peak displacement of linear and nonlinear inelastic single-degree-of-freedom systems. It is shown that a structure designed by neglecting ductility...
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