1000kV特高压输电钢管塔风振系数取值优化分析  

Wind-induced vibration coefficient optimization analysis of1 000kV UHV steel-tube transmission towers

作　　者：龙海波[1] 陶青松[1] 

机构地区：[1]江苏省电力设计院,江苏南京211102

出　　处：《武汉大学学报（工学版）》2013年第S1期69-73,共5页Engineering Journal of Wuhan University

摘　　要：针对1 000kV特高压输电钢管塔的结构特点建立铁塔有限元模型,采用AR自回归模型模拟出的脉动风荷载对模型分别进行0°风向和90°风向工况的时程分析,得到杆塔在不同风攻角作用下的响应特点以及杆塔各段的加速度方差.根据时程分析结果分别计算铁塔正侧面的各段塔身及横担的风振系数,经过比较发现横担在0°风向作用下的风振系数明显小于其在90°风向作用下的风振系数.建议在杆塔设计中对铁塔正侧面采用不同的风振系数,可以有效地降低铁塔用钢量.A finite element model(FEM)was established according to the construction features of 1 000kV ultra-high voltage steel tube transmission tower.Artificial fluctuating wind load generated with the autoregressive-type simulation method was imposed on the FEM and time-history analysis of the tower FEM was carried out.Response of the model and acceleration variance of each section,under positive wind and side wind,were concluded though the analysis respectively.Wind-induced vibration coefficient of each tower body and cross-arm were calculated.By comparison,it is found that the efficient of cross-arm under positive wind is apparently less than one under side wind.The suggestion is:different coefficients should be adopted according to the direction of wind.Steel quantity of the tower will be reduced effectively if the suggestion is adopted during tower design.

关 键 词：输电杆塔 风振响应 风振系数 

分 类 号：TU392.3[建筑科学—结构工程] TU311.3