基于拆除构件法的特高压输电塔-线体系连续倒塌分析  

Progressive Collapse Analysis of UHV Transmission Tower-line System Based on Alternate Path Method

作　　者：刘凯[1,2] 李正良[1,2] 周佳林[1,2] Liu Kai;Li Zhengliang;Zhou Jialin(College of Civil Engineering Chongqing University,400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education(Chongqing University),400045,China)

机构地区：[1]重庆大学土木工程学院,400045 [2]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4期35-41,60,共8页Special Structures

基　　金：国家自然科学基金(51078367)。

摘　　要：为探究输电塔线体系的连续倒塌过程,本文以输电线路耐张段为研究对象,使用ANSYS建立包含6座直线塔的有限元模型,使用ANSYS找形分析法求解导(地)线张力,根据计算结果并通过重写ANSYS命令流的方式判断导(地)线的断裂顺序,基于拆除构件法和ANSYS隐式非线性动力分析法对输电塔-线体系的连续倒塌破坏过程进行了分析。结果表明:距失效构件较远侧输电线先断裂,导线从上至下依次断裂,地线最后断裂;失效构件所在的直线塔易发生弯扭变形破坏,导(地)线断裂产生的冲击荷载沿着输电线向其他直线塔传递,使其也易发生弯扭变形破坏;塔腿主材失效后,屈服区域由相邻两根塔腿主材向上部主材扩展,扭转变形使塔头斜材和塔头与塔身交界处斜材失效;塔身主材失效后,屈服区域由失效位置和相邻主材位置向下部主材扩展,扭转变形使塔头与塔身交界处斜材以及下部结构的斜材失效。In order to study the progressive collapse process of transmission tower-line system,the transmission line strain section was taken as the re search object.In this paper,a finite element model with six straight towers was simulated using ANSYS.The tension of the guide(ground)line was obtained through ANSYS form finding analysis method,and the breaking sequence of the guide(ground)line was evaluated according to the calculation results and the ANSYS rewriting command.Based on the Alternate Path Method and ANSYS implicit nonlinear dynamic analysis method,the progressive collapse process of the transmission tower-line system was analyzed.The results showed that the transmission line farther away from the failed component broke first,then the wire broke from top to bottom and finally the ground wire broke.The straight tower with failure component was prone to bending and torsional failure,and the impact load caused by the breakage of the guide(ground)line was transmitted along the transmission line to other straight towers,making them also prone to the same failure type.After the failure of tower leg main material,the yield area would extend from adjacent two tower legs main materials to the upper component,the torsional deformation would make the diagonal material of the tower head and the junction material between the tower head and tower body invalid.After the failure of tower body main material,the yield area would extend from the failure location and the adjacent main material location to the lower component,the torsional deformation would make the diagonal material of lower component and diagonal material between the tower head and tower body invalid.

关 键 词：特高压输电线路 拆除构件法 连续倒塌 导(地)线张力 非线性分析 

分 类 号：TM75[电气工程—电力系统及自动化]