Experimental Research On The Cross-fault Transmission Tower-line System

UHV transmission is the mainstream direction of Chinese current transmission mode.Compared with ordinary high-voltage transmission,UHV transmission has important advantages such as low loss and saving land resources.Transmission lines inevitably have to cross seismic faults,and earthquake disasters occur frequently in China,which results in serious damage to transmission lines.UHV transmission lines,due to their large transmission capacity,will have an important impact on economic development once they were destroyed in earthquake.Therefore,it is of great significance to study the seismic response of cross-fault high-voltage transmission tower-line systems.At present,there is little research on seismic research for f cross-fault high-voltage transmission tower-line systems.Based on the shaking table test and ABAQUS finite element software,the seismic response and damage research of the cross-fault high-voltage transmission tower-line systems are studied in this paper.The following research work has been completed:(1)According to the scale theory,the shaking table test model of UHV transmission tower-line system is designed and manufactured.At the same time,the insulators which is the connecting components between transmission tower and transmission line are selected reasonably to ensure the accuracy of the test model.The fundamental frequency of the experimental model is obtained by white noise exiciting.(2)Through the shaking table test,the transmission tower-line system is excited by the near-fault pulse ground motion,and the seismic response of transmission tower-line system and transmission tower-line system are compared.and the influence law of transmission line on transmission tower in near-fault earthquake is obtained.The response pattern of the near-fault directional effect pulse ground motion and the slipping effect pulse ground motion on the seismic response of the structure is studied respectively.The seismic response of transmission tower-line system under multi-dimensional near-fault pulsed seismic excitation is studied step by step.The results show that the multi-dimensional excitation considering near-fault seismic excitation is significantly larger than that considering single-dimensional seismic excitation.(3)Through the shaking table test,the seismic response pattern of cross-fault transmission tower-line system is studied.The collapse failure test of cross-fault transmission tower-line system is carried out for the first time,and the collapse failure mechanism of transmission tower-line system under cross-fault earthquake is revealed.(4)Based on Tian-Ma-Qu material constitutive model and ABAQUS finite element software,the seismic collapse simulation of the cross-fault transmission tower-line system is carried out,and the collapse failure mechanism of transmission tower-line system under cross-fault earthquake is revealed.Compared with shaking table test results,the accuracy of material constitutive model is verified.