变电站构架避雷针结构相贯节点承载力试验研究  

EXPERIMENTAL RESEARCH ON BEARING CAPACITY OF INTERSECTING JOINTS OF SUBSTATION FRAMEWORKS WITH LIGHTNING RODS

作　　者：王朝华 赵桂峰[2] 伊运平 张猛[2] WANG Chaohua;ZHAO Guifeng;YI Yunping;ZHANG Meng(State Grid Henan Electric Power Corporation Electric Power Research Institute,Zhengzhou 450052,China;School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

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

出　　处：《工业建筑》2020年第6期150-155,共6页Industrial Construction

基　　金：国家自然科学基金项目(51108425);国网河南省电力公司科技攻关项目。

摘　　要：以某500 kV变电站构架避雷针结构为例,开展原构架避雷针相贯节点的足尺静载试验,分析其承载能力及节点应变分布特点,在此基础上进行加固相贯节点的足尺静载试验,对比分析加固前、后构架避雷针相贯节点的承载性能。研究表明:原设计构架避雷针相贯节点抗弯能力较差而且构造不合理,在平面外弯矩作用下易产生沿焊缝的撕裂破坏。通过在避雷针与横梁相贯节点区增设加劲肋,节点区的应力集中现象得以有效缓解,加固相贯节点的承载能力和抗弯刚度均显著提高。Taking a substation framework with lightning rods in a 500 kV substation as an example,the full-scale static load test of the intersecting joint based on the original was designed and performed.The bearing capacity and strain distribution characteristics of the joint were analyzed.On this basis,a full-scale static load test of the reinforced intersecting joint was also conducted and compared with the former test.The results showed that the original designed intersecting joint of the lightning rod had poor flexural capacity and unreasonable details,which could be easily torn along the weld under the action of out-of-plane bending moment.When adding stiffeners to the joint,the problem of stress concentration on the joint could be effectively alleviated,resulting in a significant improvement of the bearing capacity and flexural stiffness of the strengthened joint.

关 键 词：构架避雷针 相贯节点 承载力 足尺试验 应变分布 

分 类 号：TM863[电气工程—高电压与绝缘技术]