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通过数值模拟对输电塔线体系在地震动水平-摇摆耦合作用下的响应进行了研究。采用有限元程序分别建立了单塔和塔线耦合体系的三维有限元模型,进行模态分析和动力时程分析。对单塔和塔线体系的动力特性和在水平、摇摆和水平-摇摆耦合地震作用下的响应时程分析结果进行了对比研究。结果表明,输电线对输电塔横导线方向和顺导线方向的地震响应的影响不同,将减小输电塔横导线方向的地震效应,而将增大输电塔顺导线方向的地震效应;相比单一水平地震作用,输电塔线体系在地震动水平-摇摆耦合作用下的响应更加显著。对于输电塔等高柔结构来说,抗震设计时考虑地震动摇摆分量的影响是很有必要的。
The response of transmission line system under the action of ground-shaking coupling is studied by numerical simulation. The three-dimensional finite element model of single-tower and tower-line coupling system was established respectively by finite element program and modal analysis and dynamic time history analysis. The dynamic characteristics of single-tower and tower system and the results of response time-history analysis under horizontal, sway and horizontal-rock coupled seismic are compared. The results show that the influence of transmission line on the seismic response of the transverse conductor and the conductor of the transmission tower is different, which will reduce the seismic effect in the direction of the transverse conductor of the transmission tower and will increase the seismic effect along the conductor of the transmission tower. Compared with the single conductor Earthquake effect, transmission tower line system in the earthquake level - swing coupling response more pronounced. For the transmission tower with high and flexible structure, it is necessary to consider the influence of the shaking component of the earthquake in the design of aseismic design.