精细化风荷载作用模式下输电塔的动力响应研究  

Study on Dynamic Response of Transmission Towers under Refined Wind Load

作　　者：钟维军 徐海巍 涂志斌 姚剑锋 楼文娟[2] ZHONG Weijun;XU Haiwei;TU Zhibin;YAO Jianfeng;Lou Wenjuan(Ningbo Electric Power Design Institute,Ningbo 315000,China;Structural Engineering Institute,College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;College of Civil Engineering and Architecture,Zhejiang University of water resource and electricity power,Hangzhou 310018,China)

机构地区：[1]宁波市电力设计院有限公司,宁波315000 [2]浙江大学建筑工程学院结构工程研究所,杭州310058 [3]浙江水利水电学院建筑工程学院,杭州310018

出　　处：《结构工程师》2022年第2期81-89,共9页Structural Engineers

基　　金：国家自然科学基金项目(51978614,51838012);浙江省自然科学基金(LY19E080026,LQ19E080021)。

摘　　要：为研究精细化风荷载作用下输电塔的动力响应特性,采用高频天平测力试验获得横担和塔身及其主要杆件的体型系数,采用节点集中加载和均布加载两种风荷载作用模式,计算了高压输电塔在不同加载模式下的风致动力响应以及风振系数,并与规范结果进行对比分析。研究表明:相比试验结果,规范建议的体型系数偏低,由此得到的结构位移、加速度和杆件内力响应均偏小,但按规范方法得到的风振系数偏大;与节点集中加载方式相比,均布加载模式下塔身的总体位移和加速度响应基本不变,横担的位移和加速度响应略有增加;横担主杆、腹杆和塔身斜撑的截面最大应力均有不同程度的明显增加,而塔身主杆的截面最大正应力变化不显著。风荷载加载模式对横担的内力响应影响较大,但对塔身主杆的内力和整塔的风振系数影响较小。To study dynamic response characteristics of transmission towers under refined wind load,shape factors of overall cross arm and tower body as well as their main members were obtained by high-frequency force balance(HFBF)wind tunnel tests.Wind loads were applied in two modes,i.e.,concentrated wind loading and uniform wind loading mode,under which wind induced response and wind vibration factors of the transmission tower were calculated and compared with the current code results.The study results show that the code recommended shape factors are lower than the experimental counterparts,resulting in smaller displacement,acceleration and internal force of the tower structure,but larger vibration factors.Compared with the concentrated wind loading mode,displacement and acceleration of the tower body under uniform wind loading are almost the same while the corresponding response of the cross arm increases slightly.Under the uniform loading mode,the maximum cross-section stresses of the main and web members of the cross arm,and diagonal brace of the tower body are significantly larger than those under concentrated wind loading.However,the maximum stresses of main members of tower body and the vibration factors of the whole structure are almost the same under both loading modes.The study indicates that the wind loading mode has a significant effect on the internal force of the cross arm,but has a small influence on the internal force of the tower body and the vibration factor of the whole tower.

关 键 词：高压输电塔 风洞试验 体型系数 荷载模式 动力响应 

分 类 号：TM75[电气工程—电力系统及自动化] TU312.1[建筑科学—结构工程]