摘要
目的研究塔线耦联效应、几何非线性和线路初始张力对塔线体系动力响应的影响,并揭示各因素作用下塔线体系动力效应演化机制.方法运用ANSYS软件建立精细化仿真模型,对比简化模型和三塔四线模型在风荷载作用下的动力响应;对不同呼高的铁塔进行静力pushover分析,研究几何非线性对铁塔抗风承载力的影响以及线路初始张力的变化对塔线体系动力响应的影响.结果塔线耦联效应对塔顶位移和杆件应力的均值响应影响很小,对其均方根影响很大;当铁塔高度大于40 m时,是否考虑几何非线性所得结果相差达到25%以上.结论简化模型只能反应输电塔位移和应力的均值响应,利用塔线耦联模型才能得到真实的动力响应;几何非线性对铁塔抗风承载力的影响随塔身高度的增加而增大;导地线初始张力的变化对其动力响应影响很小,可忽略不计.
This paper studies the influence of coupling effect,geometric nonlinearity and the initial tension of transmission line on the dynamic response of the tower-line system.The three-dimensional finite element models of transmission tower-line system are established in ANSYS.The dynamic response of the simplified model and the three-tower and four-line model under wind loads is compared;the static pushover analysis of the towers with different heights are concluded to study the influence of geometric nonlinearity on the wind-bearing capacity of the tower;the effects of initial tension of transmission line are compared.The results show that the simplified model can only reflect the mean value of the tip displacement and the mean stress of the member,root-mean-square value correspondingly are invalid,and the coupling model can be used to obtain the real dynamic response;the influence of geometric nonlinearity on the wind-bearing capacity of the tower increases with the tower height,the relative error is more than 25%when the height of the tower is greater than 40 m;the effects of initial tension of transmission line are compared,which demonstrate that the change of the initial tension has little effect on the dynamic response and can be ignored.
作者
汪佳
付兴
李宏男
WANG Jia;FU Xing;LI Hongnan(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,China,116024)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第1期1-10,共10页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51708089,51421064)
中国博士后科学基金项目(2017M620101,2019T120207)
中央高校基本科研业务费(DUT19RC(4)021)
关键词
塔线体系
风荷载
耦联效应
几何非线性
初始张力
transmission tower-line system
wind loading
coupling effect
geometric nonlinearity
initial tension
