输电塔-线体系覆冰作用非线性分析  

Nonlinear Analysis of Elecrictrical Transmission Tower-Line System with Icing Loads

作　　者：晏致涛[1] 刘操兰[2] 李正良[1] 汪之松[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]中国电力科学研究院,北京100192

出　　处：《土木建筑与环境工程》2010年第1期36-41,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金资助(50708118;50678181);重庆市自然科学基金资助(CSTC;2007BB0133);重庆大学青年教师基金资助(0218001104305)

摘　　要：在重冰区,高柔大跨越输电塔-线体系在覆冰、风载等作用下具有强烈的耦合特性和非线性特征。推导了绝缘子、索以及边界条件的刚度表达式,以向家坝-上海±800 kV特高压直流输电线路为例,建立了输电塔、导线、绝缘子以及边界条件的简化数值分析模型。对大跨越输电塔-线体系进行了7种工况下的静力非线性分析。分析表明,在导线均匀覆冰及风荷载作用下,铁塔构件的P-Δ效应较小;在不均匀覆冰工况下,导线不平衡荷载对铁塔产生扭转效应,铁塔受压支座节点和最大悬臂处单元的轴向压力和弯矩具有较明显的P-Δ效应,应考虑荷载非线性的不利影响。The intense coupled and nonlinear behaviors were observed on the tall long-span tower-line systems which were under the icing and wind loads in heavy icing areas. A set of stiffness equations of insulator, conductor and boundary conditions was deduced. Taking the ±800 kV UHV DC transmission line from Xiangjiaba to Shanghai as an example, the simplified numerical model of transmission tower, conductor, insulator and constraint was developed. The long span transmission tower-line system models under seven loads conditions were analyzed by static nonlinear methods. It was found that the P-△ effect of tower components was small when the covered ice was uniformly distributed. The unbalanced wire loads on the tower would lead to twist effect when the covered ice was uneven distributed. The axial forces, moments at restraint nodes and the longest cantilever member were greatly affected by the P-△ effect, under which the unfavorable effect on the structure should be considered.

关 键 词：输电塔 导线 不均匀覆冰 几何非线性 P-Δ效应 

分 类 号：TU311.3[建筑科学—结构工程] TM753[电气工程—电力系统及自动化]