Response Analysis Of Transimission Tower-line System Subjected To Multi-Angle Ground Motion Of Different Incipdence Angle

As a carrier of power transmission and energy transmission in transmission line engineering,the seismic research of transmission tower-line system is becoming more and more important.Although experts and scholars at home and abroad have paid enough attention to the transmission tower-line system and carried out related research,there are still deficiencies.This paper mainly proposes an approximate calculation method for the fundamental period of the transmission tower-line system,and carries out the shaking table test research and collapse vulnerability research of the transmission tower-line system under different incident angles of ground motion.The specific research content is as follows:(1)Based on the Rayleigh method,the calculation model of the transmission tower-line system is simplified,and an approximate calculation method for the fundamental period of the transmission tower-line system is proposed.The accuracy of the results is verified by Sap2000 finite element calculation comparison.(2)The scale model shaking table test of the transmission tower-line system was carried out,the dynamic response(acceleration,strain and displacement)of the transmission tower-line system under different ground motion incident angles was studied,and the most unfavorable ground motion incident direction was determined according to the test data.Using the ABAQUS finite element analysis software,a three-dimensional finite element model of the transmission tower-line system was established,and the time response method was used to obtain the dynamic response of the transmission tower-line system under different ground motion incident angles and the most unfavorable ground motion incident angle.The results of test and time history analysis were compared with the approximate method of determining the worst angle of incidence(3)The period obtained by the period approximation calculation method is substituted into the approximation method based on the displacement spectrum for optimization,and the result is compared with the original displacement spectrum approximation method.The feasibility and convenience of applying the period approximation calculation method to determine the most unfavorable ground motion incident angle are verified.(4)Using the ABAQUS finite element analysis software,a three-dimensional finite element model of the transmission tower-line system was established.The transmission tower-line system model was subjected to ground motion excitation in different incident directions.Research work on the collapse process,collapse vulnerability and weak location of transmission tower-line system under different incident angles of ground motion was carried out.