高压变电站构架避雷针结构抗震性能分析  

Seismic analysis of a substation framework with lightning rods

作　　者：张劲光 王朝华 库永恒 陈怡文 伊运平 赵桂峰[3] 

机构地区：[1]国网河南省电力公司,河南郑州450052 [2]国网河南省电力公司电力科学研究院,河南郑州450052 [3]郑州大学土木工程学院,河南郑州450001

出　　处：《世界地震工程》2017年第3期192-201,共10页World Earthquake Engineering

基　　金：国网河南省电力公司科技攻关项目

摘　　要：以某500k V高压变电站为基础,建立了设置避雷针和未设置避雷针的变电构架结构的ANSYS有限元模型,分别进行了这2种模型的动力特性分析和动力时程分析,了解了高压变电站构架避雷针结构的抗震性能特点。研究表明:设置避雷针的变电构架模态频率明显降低,而且频率分布更为密集,振型主要以避雷针的局部振动为主。地震作用下,构架避雷针顶点位移增大很多,存在显著的鞭梢效应;避雷针底部与构架横梁交接部位杆件应力水平增加较多,设计和施工时应格外注意。A study on the seismic performance of substation framework with lightning rods was carried out. The AN- SYS finite element models of substation framework with and without lightning rods were established based on a 500kV high voltage substation. The modal analysis and dynamic time history analysis of the two models were per- formed to evaluate the seismic performance of the above mentioned substation frameworks. The results show that, the modal frequencies of substation framework with lightning rods are significantly reduced, and the frequencies dis- tribution is more intensive. There are obvious whiplash effects on the lightning rods under different seismic excita- tions. The stress of lightning rod bottom increased more, this illustrates that it is relatively weak and more attention should be paid during design and construction.

关 键 词：高压变电站 变电构架 避雷针 模态分析 抗震性能 

分 类 号：P315[天文地球—地震学] TM75[天文地球—固体地球物理学]