摘要
为探索下击暴流作用下输电塔-线体系连续倒塌的性能,文中采用容量需求比(DCR)为构件破坏准则的输电塔-线体系连续倒塌动力仿真分析方法。模拟了下击暴流风场,并运用LS-DYNA对非稳态下击暴流下的输电线路连续倒塌进行数值模拟,对输电塔的倒塌过程、杆件失效路径、DCR等指标开展分析。结果表明塔脚辅助材、交叉斜材和塔腿主材依次破坏,并导致输电塔倒塌,方法可以有效模拟塔-线体系的连续倒塌过程,揭示输电塔的倒塌机理及薄弱部位,为输电塔-线体系抗倒塌设计提供理论支撑。
This study employs a dynamic simulation analysis method with demand to capacity ratio(DCR) as the failure criterion for components to explore the progressive collapse of transmission tower-line system(TLS) under downbursts.The non-static downburst wind field is simulated,and LS-DYNA is deployed to simulate TLS collapse,in which the collapse process of tower,the failure path of members,and DCR indicator are analyzed.The results show that the tower base auxiliary materials,cross bracings,and tower leg materials are successively damaged,leading to the collapse.This method effectively simulates the progressive collapse of TLS,revealing the collapse mechanism and weak points,which provides theoretical support for the anti-collapse design of TLS.
作者
吴昊
陈勇
楼文娟
WU Hao;CHEN Yong;LOU Wenjuan(Institute of Structural Engineering,Zhejiang University,Hangzhou 310058,China)
出处
《低温建筑技术》
2023年第8期1-5,共5页
Low Temperature Architecture Technology
基金
国家自然科学基金项目(51838012)。
