WIND-INDUCED DYNAMIC RESPONSE ANALYSIS FOR POWER TRANSMISSION TOWER BY PDEM

As taller- and longer-span power transmission towers (PTT) are recently being constructed in China, they tend to be more sensitive to wind action, and it is more important to accurately estimate their response to wind forces. For this purpose, a new method, called as probability density evolution method (PDEM), which had been proved to be of high accuracy and efficiency, is firstly described, Secondly, wind stochastic field is studied from a new viewpoint of stochastic Fourier spectrum (SFS). The basic random parameters of the wind stochastic field, that is, the roughness length z₀ and the mean wind velocity at 10m height U₁₀, as well as their probability density functions (PDF), are obtained. It provides opportunities to apply the PDEM in this problem here. The wind-induced dynamic response for a PTT was studied. The time process of mean and standard deviation of the top displacement response were obtained, and the instantaneous PDF of it was shown by means of two-dimensional and three-dimensional pictures. All of them verify that the PDEM is feasible and efficient in the dynamic response analysis of wind-excited PTT.