【摘要】 以广东省汕头市的500 kV榕江大跨越输电塔为背景,建立了塔线体系的空间有限元模型,采用振型分解反应谱法和时程分析法对其三向输入时的多遇地震反应进行了计算。对塔线体系动力特性进行了分析总结,对两种计算方法的结果进行了比较,并对大跨越输电塔中的控制杆件在地震作用下的内力和设计控制内力进行了对比研究。结果发现,单塔的频率大于塔线体系中塔的频率,但两者较为接近;塔线体系的地震响应小于单塔,导地线对输电塔抗震是有利的;地震效应在该塔设计中不起控制作用,但下横担拉杆和塔身二次变坡以下的K型支撑在地震作用下的设计轴力为设计控制轴力的90%,是结构抗震设计中的相对薄弱部位。对于大跨越高塔来说,抗震设计时考虑地震工况对横担主材拉杆、横担处塔身上横隔面主材和部分塔身斜材的影响是很有必要的。更多还原

【Abstract】 Under the background of 500kV Rongjiang large crossing transmission tower-line system in Shantou,Guangdong province,a spatial finite element model of the system was established,its seismic responses were computed by using the mode-decomposition method and the time-history analysis method,respectively.Its dynamic characteristics were summarized and comparisons of the results of the two methods were conducted.Moreover,contrastive analysis of the internal forces and the designed critical forces of the key members was performed.It was found that the frequencies values of the single tower is larger than those of the tower in the system,but they are close to each other;the responses of the system are smaller than those of the single tower;the lines is benefit for the tower when considering earthquake action and seismic effects are not a critical factor for tower design;however,tensile members in cross arm and K bracing under the second slope are weak sections,the ratio of whose axial forces and critical forces approximately is 90%.So,it was necessary to consider the effects of earthquake actions on tensile members in cross arm and bracing members of tower body for large crossing transmission tower designs.更多还原