Numerical Simulation of Spatial Fluctuating Wind Field on Long Span Bridges

In order to reduce the calculating amount and memory consumption of the traditional wave superposition method and to obtain a highly effective simulation method with precision, BP neural network method is utilized to fit the factorized spectral density function curves so as to reduce the calculating frequency of Cholesky factorizations of cross spectral density spectrum. Furthermore, the FFT technique is used to decrease the time consumption of the harmonic wave synthesis. The improved WAWS method enhances markedly the computational efficiency.