转角输电塔脉动实测与分析  

Site Measurement and Analysis of Dynamic Behavior for Transmission Tower around the Corner

作　　者：闫祥梅[1] 何敏娟[1] 马人乐[1] 刘慧群[1] 梁杰[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《特种结构》2008年第2期6-8,共3页Special Structures

基　　金：国家自然科学基金资助重点项目(50638010)

摘　　要：高压输电塔-线体系是一种复杂的空间塔线耦联振动体系,对其精确计算十分困难,位于转角处的输电塔受力性能更为复杂。通过对一呼高为24m的干字形转角塔进行现场环境脉动测试,分析出该转角塔前几阶频率、振型、阻尼比等动力特性参数,得出转角塔的主要振动形式为扭转振动及纵横向的耦合振动。由于转角塔横担上下结构刚度差别较大,地线支架部分鞭梢效应明显。High-voltage transmission line system is a kind of complicated system, it is very difficult to calculate it accurately. The tower around the corner is more complicated than others. So the ambient vibration testing of transmission tower around the corner was carded out. Dynamic properties such as natural frequency, mode shapes and damping ratios are extracted from ambient testing data. The experimental result indicates ： the tower＇s main vibration forms are torsion vibration and coupling vibration on transverse direction and longitudinal direction. Stiffness under the crosspieces of the tower is bigger than its upper part. The stiffness difference leads to obvious whiplash effect of the tower.

关 键 词：输电塔线体系 脉动实测 塔线耦合 模态识别 

分 类 号：TU347[建筑科学—结构工程]