385m超大型长江大跨越输电塔铸钢节点受力性能研究  

Research on Cast Steel Joints Used in a 385-Meter Super Long-Span Transmission Tower Crossing the Yangtze River

作　　者：舒赣平[1] 罗柯镕 王章轩 朱姣 余亮 墨泽 宁帅朋 SHU Ganping;LUO Kerong;WANG Zhangxuan;ZHU Jiao;YU Liang;MO Ze;NING Shuaipeng(School of Civil Engineering,Southeast University,Nanjing 211189,China;State Grid Jiangsu Electric Power Company Construction Branch,Nanjing 210011,China;Jiangsu Power Design Institute Co.,Ltd.of CEEC,Nanjing 211102,China)

机构地区：[1]东南大学土木工程学院,南京211189 [2]国网江苏省电力有限公司建设分公司,南京210011 [3]中国能源建设集团江苏省电力设计院有限公司,南京211102

出　　处：《工业建筑》2022年第8期34-40,47,共8页Industrial Construction

基　　金：国家电网有限公司科技项目资助(SGJSJSOOXMJS2000259)。

摘　　要：针对国家重点工程385 m超大型长江大跨越输电塔横担-主材连接节点处杆件交汇多、空间关系复杂、荷载条件特殊等特点,首次提出在该大跨越输电塔同类型节点处采用铸钢节点。考虑到铸钢节点外形复杂、重要性程度高等特点,为验证其设计的安全性和合理性,设计了两个1∶2节点缩尺模型并进行承载力性能检验性试验及有限元分析。研究结果表明:90°大风试验工况下节点最大应力区为节点杆件倒角处,其应变随荷载基本呈线性变化,节点整体处于线弹性状态;有限元分析结果与试验结果吻合良好,表明有限元节点模型能真实有效模拟节点实际受力情况;有限元弹塑性分析结果表明该铸钢节点极限承载力为设计荷载的12.39倍,有较大的安全冗余度,节点设计安全可靠。In view of the characteristics of many member intersections, complex spatial relations and special load conditions at the connection joint of cross arm and main rods in a 385-meter super long-span transmission tower crossing the Yangtze River, which is a national key project, cast steel joints were proposed to applied in the transmission tower for the first time. Considering the characteristics of complex shape and high importance of cast steel joints, two 1∶2 scaled models of joints were designed and the bearing capacity verification test and finite element analysis were carried out in order to verify its safety and rationality.The results showed that under the 90° gale test condition, the maximum stress location of the joint was the chamfer of the member, the strain basically changed linearly with the load, and the whole joint was in a linear elastic state. The experimental results were in good agreement with the finite element analysis results, which showed that the joint model could truly and effectively simulate the actual stress of the joint. The finite element elastic-plastic analysis results showed that the ultimate bearing capacity of the cast steel joint was 12.39 times of the design load, with a large safety redundancy, and the joint design was safe and reliable.

关 键 词：大跨越输电塔 铸钢节点 缩尺试验 有限元分析 

分 类 号：TM75[电气工程—电力系统及自动化] TU391[建筑科学—结构工程]