海岛输电塔线体系风振响应及易损性分析OA

The wind resistance performance evaluation of the transmission tower was studied based on the newly built single circuit cat head tower ZMG32-28.5 and its tower line system on the 3572 line in Dongtou Island,Wenzhou.Firstly,ANSYS software was used to establish a finite element model of the transmission tower and its tower line system to carry out the theoretical analysis of the dynamic characteristics of the single tower and tower line system.Then,according to the typhoon wind spectrum,the harmonic superposition method was used to generate the pulsating wind speed time history with typhoon characteristics.The wind vibration response analysis of the tower line system was carried out to understand the tower body response under the action of the design wind speed of the tower line system.Finally,considering the uncertainty of transmission tower structural parameters and fluctuating wind loads,80 sets of random samples of tower line systems were generated using the Latin hypercube sampling method.The corresponding fluctuating wind speed time history with typhoon characteristics was simulated using the harmonic superposition method.Random samples of the tower line system were combined with wind loads one by one,and the wind vibration response of the tower line system was analyzed.The regression analysis of the wind vibration response results shows that the mean and standard deviation values of the transmission tower wind load effect function and the tower top displacement response considering the tower line coupling effect were obtained.Moreover,a static elastoplastic(Pushover)analysis was performed on 80 random samples of transmission towers,and the limit values and standard deviation values of each limit state of the transmission tower structure were determined.Based on the calculation results of the above two analyses,the wind vulnerability analysis of transmission towers considering the coupling effect of tower lines was carried out,and the wind vulnerability curves of slight,medium and collapse damage under the wind angle conditions of 0°(along line)and 90°(horizontal line)were obtained.The results show that under the extreme wind speed of 55 m/s,the probability of damage in the wind direction of the horizontal line increases by 8.25%compared with the wind direction of the smooth line.When the wind speed(41.95 m/s)is 100 years in the reproduction period,the probability of collapse failure in the direction of the transverse line is 20.19%,and the ZMG32-28.5 tower has good wind resistance.