大跨越输电塔线体系地震反应分析

邓洪洲;司瑞娟;邓凌君

振动与冲击 ›› 2011, Vol. 30 ›› Issue (7) : 173-177.

PDF(1443 KB)
PDF(1443 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (7) : 173-177.
论文

大跨越输电塔线体系地震反应分析

  • 邓洪洲; 司瑞娟; 邓凌君
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Analysis on seismic responses of large crossing transmission tower-line system

  • Deng Hong-zhou; SI Rui-juan; DENG Ling-jun
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摘要

以广东省汕头市的500KV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。

Abstract

Under the background of the project of 500kV Rongjiang large crossing transmission lines in Shantou, Guangdong province, According to spatial finite element modal of the system, the frequent seismic responses were discussed by using mode-decomposition method and time-history analysis method respectively. Dynamic characteristics were summarized and comparisons of the results of the two methods were conducted. Moreover, contrastive analysis was carried out on earthquake internal forces and design critical forces of the key members. It is found that frequencies values of single tower is larger than that of the tower in the system while they are close to each other, responses of the system are smaller than that of single tower, the lines is benefit for the tower when considering earthquake action and seismic effects are not critical factor for the design. However, tensile members in crossarm and K bracing under the second slope are weak sections, the ratio of whose seismic forces and critical forces approximately is 90%. So, it is very necessary to consider earthquake actions for tensile members in crossarm and bracing members on tower body in large crossing transmission tower’ designs.

关键词

大跨越 输电塔线体系 地震反应谱 时程分析

Key words

large crossing / transmission lines / earthquake response spectrum / time history analysis

引用本文

导出引用
邓洪洲;司瑞娟;邓凌君. 大跨越输电塔线体系地震反应分析[J]. 振动与冲击, 2011, 30(7): 173-177
Deng Hong-zhou;SI Rui-juan;DENG Ling-jun. Analysis on seismic responses of large crossing transmission tower-line system [J]. Journal of Vibration and Shock, 2011, 30(7): 173-177

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