考虑SSI的滑坡区输电塔线体系安全性分析
Safety analysis of transmission tower-line system in landslide area considering SSI
陈树平 1李成 1王彦海 2苗红璞 1李双林 1周冬阳2
作者信息
- 1. 中国南方电网超高压输电公司梧州局,广西 梧州 543002
- 2. 三峡大学湖北省输电线路工程技术研究中心,湖北 宜昌 443002
- 折叠
摘要
为探究边坡变形对输电塔线体系安全性的影响规律,以位于滑坡体上的某输电塔线体系为研究对象,采用有限元数值计算方法,考虑塔线耦合作用、土-结构相互作用(SSI)以及边坡变形程度与方向的影响,建立了输电塔线体系整体有限元模型,探究了塔线体系受力特性对边坡变形的响应规律,提出了可用于评估滑坡区输电线路安全性的2个参数,即铁塔塔腿支座位移以及塔腿根开变化值.结果表明:在典型边坡变形作用下,上部塔线体系的失效以第一横隔面以及导线悬挂点附近主材、交叉斜材等杆件的屈服为标志;边坡变形角度对塔线体系失效特征的影响不大,但对其抗边坡变形能力的影响显著;总体来看,塔线体系承受一定倾角边坡变形的能力远小于承受水平地表变形的能力,其中大部分情况下只能承受水平地表变形工况下塔腿支座变形的70%～80%,拉伸变形工况下只能承受水平地表变形工况下塔腿支座变形的60%左右.研究结果对滑坡区输电铁塔的安全防治有指导意义.
Abstract
In order to explore the influence of slope deformation on the safety of transmission tower-line system,taking the tower-line system of UHV transmission line located on the landslide as the research object,bases on the finite element numerical calculation method,with consideration of the influence of tower-line coupling,the soil-structure interaction(SSI),and the degree and direction of slope deformation,this paper established a over-all finite element model for transmission tower-line system,and explored the response law of the stress charac-teristics of the tower-line system to slope deformation,and put forward two monitoring parameters that can be used to evaluate the safety of transmission lines in landslide areas,namely the displacement of tower leg support and the change value of tower leg root opening.The results show that under typical slope deformation,the fail-ure of the upper tower-line system is marked by the yield of the first cross-partition,the principal and cross-diagonal members near the suspension point of the conductor.The angle of slope deformation has little effect on the failure characteristics of the tower line system,but has a significant impact on its ability to resist slope defor-mation;overall,the capacity of the tower system to bear slope deformation with a certain inclination angle is far less than that of horizontal surface deformation,most of which can only bear 70%～80%of the deformation of tower leg support under horizontal surface deformation and only bear about 60%of the deformation of tower leg support under horizontal surface deformation under tensile condition,which can provide guidance for the safety prevention and control of transmission towers in landslide areas.
关键词
滑坡区/安全性分析/塔线体系/土-结构相互作用(SSI)/抗边坡变形能力/有限元数值计算方法Key words
landslide area/safety analysis/tower-line system/soil-structure interaction(SSI)/resistance to slope deformation/finite element numerical calculation method引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据