THE RELIABILITY ANALYSIS OF HIGH-RISE SLENDER STRUCTURES SUBJECTED TO NON-GAUSSIAN WIND LOAD

With special reference to the non-Gaussian model of wind-load,the statistical moments of fluctuating wind forces until the 5th order are deduced for Davenport spectrum.The probabilistic characteristic function and Fourier transformation are employed to evaluate the joint statistical distribution of modal responses,which has the form of Gram-Charlier series.Based on Rice formula and Poisson assumption,the effects of both wind-load models on the reliability analysis of high-rise slender structures are discussed.An example demonstrates that the reliability analysis of high-rise slender structures requires the non-Gaussian model of wind load.The 5th order Hermite series is recommended for describing the joint statistical distribution with the purpose of higher accuracy.It is acceptable to assume the statistical independence between the modal displacement and its derivative for simplified analysis,with the failure probability slightly overestimated.