输电线路角钢塔交叉斜材极限承载力研究  

Study on the Bearing Capacity of Cross-diagonal Bracing in Transmission Line

作　　者：刘洪义[1] 李正良[2,3] 刘凯[2,3] Liu Hongyi;Li Zhengliang;Liu Kai(Northeast Electric Power Design Institute,Changchun 130021,China;College of Civil Engineering Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University),Ministry of Education,400045,China)

机构地区：[1]东北电力设计院有限公司,130021 [2]重庆大学土木工程学院,400045 [3]山地城镇建设与新技术教育部重点实验室(重庆大学),400045

出　　处：《特种结构》2020年第3期55-62,共8页Special Structures

基　　金：国家自然科学基金(51078367)。

摘　　要：为研究输电塔交叉斜材的失稳特征,本文设计了两种输电塔平面节间真型试验,研究交叉斜材在不同拉压比下的极限承载力变化规律和破坏模式,并使用ANSYS有限元软件对两种节间进行数值模拟分析,对比分析试验和有限元结果,可以得出:仅斜材节间在不同拉压比下均在受压斜材长段中点附近发生屈曲破坏,当拉压比≤-0.2时,截面绕最小轴屈曲,当拉压比>-0.2时,截面绕平行轴屈曲;对于添加辅助材的复杂节间,当拉压比≤-0.2时,受压斜材长段中点附近发生绕平行轴屈曲破坏,当拉压比>-0.2时,压杆整体发生绕平行轴的平面外屈曲破坏。随着拉压比增大,复杂节间平面外最大变形逐渐由压杆长段中点向交叉点移动。复杂节间在多数拉压比工况下的试验极限承载力高于规范计算值,研究结果可为输电线路角钢塔设计提供参考。In order to study the instability characteristics of the cross-bracing in transmission tower,in this paper,two types of lattice sections were tested to study the change law of the bearing capacity and the failure mode of cross-bracing under different tension and compression ratios.The numerical simulation analysis of the two sections were carried out by ANSYS,comparing the test results with the finite element results,it can be concluded that:in the only diagonal material section,the buckling failure was occurred nearby the midpoint of long section of the compression member,when the ratio≤-0.2,the section buckled around the minimum axis,when the ratio>-0.2,the section buckled around the parallel axis;As for the complex section with auxiliary materials,when the ratio≤-0.2,nearby the midpoint of long section of the compression member occurred buckling failure around parallel axis,when the ratio>-0.2,the whole compression member occurred out-of-plane buckling failure around the parallel axis.As the tension-compression ratio increased,the location of the maximum out-of-plane deformation of the complex section gradually moved from the midpoint of the long section of the compression member to the intersection.The bearing capacity of complex section was higher than the code calculation value under most tension and compression ratio.The research results can provide reference for the design of cross-diagonal bracing in transmission line.

关 键 词：交叉斜材 真型试验 有限元 极限承载力 拉压比 

分 类 号：TM75[电气工程—电力系统及自动化]