基于气弹模型风洞试验的输电塔—线体系风致响应分析  

Analysis on Wind-induced Response of Transmission Tower-line System Based on Aero-elastic Model Wind Tunnel Test

作　　者：王述良[1] 梁枢果[1] 熊铁华[1] 汤怀强 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《水电能源科学》2014年第8期169-172,177,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51078296)

摘　　要：为分析输电塔—线体系的风效应,设计并制作了输电塔—线体系完全气弹模型,通过风洞试验测试了不同风速和风向角下单塔沿高位移响应、导线线端张力作用下的绝缘子动应变,导线1/4、1/2和3/4跨位移响应以及挂线后输电塔沿高位移响应。结果表明,输电塔挂线与不挂线位移响应随风速递增,且塔顶位移变化显著;强风作用下导线发生明显的风偏振动;挂线后输电塔线体系振动呈非线性耦合特性。重现了输电塔在极限风荷载作用下的风毁现象,与实际破坏模式相符。可见通过对输电塔进行局部优化,可在增加少量构件的情况下,使倒塔极限风荷载得以显著提高。In order to analyze the wind-induced effects of transmission tower-line system, an aero-elastic model of transmission tower-line system had been designed and made for the wind tunnel test. Displacements along the tower height under different wind speeds and directions were measured. Dynamic strain of the insulators caused by the dynamic tensions of the lines as well as the displacements on the position 1/4, 1/2 and 3/4 of the lines along the span were also measured. The results show that the displacements of the tower with or without lines increased with the wind speed, the top displacements in particular changed significantly; defection and oscillation of the lines were very significant which would cause great impact to the tower; under the condition of lines installed on the tower, the vibration of the transmission tower-line system manifested nonlinear coupling charaeteristics; wind-induced damage phenomenon of the tower with lines was reproduced in this wind tunnel test, which was consistent with the actual failure mode. Finally, structural optmization was conducted in the test to improve the wind resistance capability of the tower, and results demonstrated that only slight increase of the structural members can enhance the limit wind speed significantly when tower damaged.

关 键 词：输电塔—线体系 气弹模型 风洞试验 风致响应 结构优化 

分 类 号：TU311.3[建筑科学—结构工程] TU317.1