高烈度地震区特高压直流输电塔线体系地震反应分析
Seismic Response Analysis of Ultra-High Voltage Direct Current Transmission Tower-Line System in High Seismic Intensity Region
为探究9度设防烈度下某在建特高压直流输电线路的抗震设计方法的适用性,本文建立了某在建特高压直流输电线路在9度设防烈度下的空间有限元模型,研究分析了塔线系统的动力特性,比较了不同模型和计算方法的地震响应结果,并对地震作用下的杆件内力和杆件设计承载力进行对比研究。结果显示,导地线会显著降低输电塔频率,对输电塔具有一定减震作用,但若在地震响应计算时忽略导地线,则会使得横担杆件内力被低估。此外,地震工况下各杆件内力较小,地震效应在输电塔设计中并非主要控制因素。但在直线塔中的横担主材拉杆和塔身变坡处主材,以及耐张塔中的横担导线挂点上部受拉材,杆件地震工况内力占设计承载力的80%以上,是相对薄弱部位,可考虑对其适当加强。
In order to explore the applicability of the seismic design method of an ultra-high voltage (UHV) direct current (DC) transmission line under construction under 9-degree seismic intensity, this study presents a spatial finite element model for a UHV DC transmission line under 9-degree seismic intensity. The dynamic characteristics of the tower-line system are analyzed, the results of different models and methods are compared, and the design bearing capacity of the members are compared and studied. The results reveal that the lines significantly reduce the tower frequency and provide seismic damping. However, neglecting the lines in seismic response calculations underestimates cross arm rod forces. Furthermore, it is observed that the internal force of each rod under seismic conditions is relatively small compared to the design control internal force. This suggests that seismic effects are not the primary control factor in transmission tower design. However, it is important to note that the internal force of seismic conditions accounts for more than 80% of the design bearing capacity for the tensile members in cross arm and the angle steel column at the slope transition zones of the tower body in the tangent tower and the tensile members in cross arm in the tension tower. Therefore, it is recommended to consider appropriate reinforcement measures in these parts.
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国家自然科学基金(51508054)
安徽省电力设计院科标业项目(KY-20-01)
中国电力工程顾问集团有限公司科研项目(DG2-D01-2024)
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