摘要
输电塔-线体系为高耸柔性结构,易受风荷载与覆冰荷载的影响。随着设计标准的提高,一些运行时间久、建设标准低的老塔需要维护,同时新建塔缺少抗风抗冰结构加强性设计指导。文章以某220 kV猫头型输电塔塔线耦联体系为研究对象,运用有限元模拟结构在风冰耦合工况下的运行状况,结果表明:输电塔-线体系在风载冰载作用下杆塔的挂线点、塔身中部、塔腿主材可能出现局部破坏。针对这一系列杆塔安全性能不足的问题,可采用增大主材截面与添加横格的措施对结构进行加固。运用弧长法分析加固前后输电塔的静力承载能力,得出以下结论:加固塔腿主材经济有效;添加横格安全性能提升最大;加固塔身主材耗材多且效果差,为最不理想方案。
Transmission tower-line system is a high-rise flexible structure, which is easily affected by wind load and icing load. With the improvement of design standards, some old towers with long operation time and low construction standards need to be maintained, and the newly-built towers lack the strengthening design guidance of wind and ice resistant structures. In this study, a 220 kV cat-head transmission tower line coupling system was taken as the research object, and the finite element method was used to simulate the operation of the structure under the wind ice coupling condition. The results show that the tower hanging point, the middle of the tower body and the main materials of the tower leg may be damaged locally under the action of wind and ice load. In view of the lack of safety performance of these towers, the structure was strengthened by increasing the section of main timber and adding crossbars, and the static bearing capacity of the power transmission towers before and after reinforcement was analyzed by arc length method. It is concluded that strengthening the main material of the tower leg is economical and effective, adding the cross lattice can improve the safety performance the most, and strengthening the main material of the tower body has more consumables and poor effect, which is the least ideal scheme.
作者
龚桢佳
赵宝成
GONG Zhenjia;ZHAO Baocheng(Jiangsu Key Laboratory of Structure Engineering,Suzhou University of Science and Technology,Suzhou 215011)
出处
《常州工学院学报》
2023年第1期45-52,共8页
Journal of Changzhou Institute of Technology
关键词
输电塔-线体系
覆冰工况
风荷载动力分析
杆塔加固
transmission tower-line system
ice-covered condition
dynamic wind load
tower reinforcement
