多维地震激励下特高压直流输电塔的响应分析

Seismic Response Analysis of Ultra-high Voltage Direct Current Transmission Tower under Multi-component Ground Motion Excitation

强震作用会对输电塔造成巨大的破坏,其中特高压直流输电塔因其高度高、柔度大,对地震载荷作用更敏感。建立了三基±800kV特高压直流输电塔模型,采用有限元软件进行多维地震动模拟,对比分析了不同呼称高度的特高压直流直线塔、耐张塔的多维地震动特征。研究结果表明:呼高较高的输电塔在多维地震激励下的响应明显大于呼高低的输电塔;同时,耐张塔的响应比直线塔的响应小。因此为提高输电线路的抗震能力,应适当降低输电塔的呼称高度,并且增加耐张塔的数目。

A huge damage will be caused by violent earthquake on transmission tower,especially in ultra-high voltage direct current(UHVDC)transmission,for its high altitude and flexibility.Three finite element models of the±800 kV transmission tower were established and the multi-component seismic wave simulation analysis was carried out by finite element software.The seismic responses of straight-line tower are analyzed in different nominal height,and the differences between straight-line tower and multi-circuit strain tower.The results show that the responses on high nominal height are significantly larger than those on low nominal height.Meanwhile,the responses on straight-line tower are larger than those on multi-circuit strain tower.Thus,in order to improve the seismic capacity of transmission line,the nominal height of transmission tower should be reduced and the number of multi-circuit strain tower should be increased.