| With the rapid development of our country's economic construction,the demand for electricity supply in various industries is increasing day by day.The issuance of the "13th Five-Year Plan" for the development of electric power has placed higher demands on the construction of electric power facilities in China.Due to the extensive coverage of the power supply network,transmission line engineering inevitably needs to pass through complex and unfavorable terrain,and the structural form of the transmission tower develops to a higher and more complex direction.So,earthquakes have caused damage to transmission towers from time to time.Therefore,in order to ensure the safety of people's property and national production and construction,it is great significance to carry out research on the seismic performance of transmission tower-line systems.At present,there is little research on the transmission tower-line system considering the soil-structure dynamic interaction(SSI),the dynamic response under earthquake motion and the collapse under earthquake.Based on the explicit analysis method,this paper studies the influence of SSI effect and the traveling wave effect of ground motion on the dynamic response of the structure,the collapse mechanism of transmission tower line system under uniform input of ground motion is studied considering SSI.The main contents are as follows:(1)Based on a 220kV transmission line practical project,fine finite element model of the transmission tower and transmission tower-line system considering the SSI effect and the assumption of rigid foundation are established.The dynamic characteristics of the structure were analyzed,and the effects of transmission lines and SSI effects on the dynamic characteristics of the transmission tower were studied.(2)Based on the time-history analysis method,compared with the response of the transmission tower with rigid foundation assumption,the dynamic responses of the transmission tower-line system considering pile-soil-structure interaction under four site types are analyzed.The effect of SSI effect on seismic response of tower-line system under different site conditions is summarized.(3)The dynamic response of transmission tower line system considering SSI effect and rigid foundation assumption under uniform input and traveling wave input is studied.The influence of traveling wave effect on the seismic response of two basic form models is summarized,and the effect of interaction between SSI effect and traveling wave effect is also summarized.(4)Based on the material subprogram considering the instability effect of the rod,the collapse of the transmission tower and transmission tower-line system under the seismic action considering the SSI effect and the rigid foundation hypothesis are simulated,the ultimate seismic bearing capacity of the transmission tower and the transmission tower-line system was studied.The type and location of the failure member,the damage distribution,and the weak position of the transmission towerwere analyzed. |
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