格构式钢管输电塔风振系数研究  

Study on wind-induced vibration coefficient of steel tubular transmission truss tower

作　　者：杨靖波[1] 牛华伟[2] 华旭刚[2] 吴静[1] 陈政清[2] 

机构地区：[1]中国电力科学研究院输变电工程力学研究所,北京100055 [2]湖南大学风工程试验研究中心,湖南长沙410082

出　　处：《建筑结构学报》2010年第S2期182-186,共5页Journal of Building Structures

基　　金：国家自然科学基金项目(50808070);国家电网公司科技项目(AKZ3070733)

摘　　要：1000kV同塔双回输电塔平均高度超过100m,结构设计中需要考虑风荷载的动力效应。由于输电塔的外形不规则和分布多处较大集中质量,直接利用荷载规范计算其顺风向风振系数会存在较大误差。根据输电铁塔的结构特征,在荷载规范计算方法基础上,提出适用于输电铁塔的风振系数的理论计算方法。并制作1/25的刚性模型,在均匀流场的风洞中进行天平测力试验,获得铁塔的体型系数和静力风荷载;采用有限元方法分析动力特性,制作1/50的气弹模型,测试Davenport风速谱下的风振响应,得到铁塔的动力风荷载。对风洞试验、荷载规范及理论算法的风振系数结果进行了比较。研究推荐的风振系数理论计算方法及取值反映了结构外形的变化,与试验值接近。Since the average height of 1000kV double circuit transmission towers is over 100m,dynamic effect of wind load should be taken into account in its structural design.Considering the irregular figure and scattered masses of transmission tower,there might be some errors in the calculation of wind-induced vibration coefficient in along-wind direction which is in accordance with'Load code for the design of building structures'.A rigid model of tower with 1/25 scale is tested in symmetrical flow wind tunnel,and the figure coefficient and static wind load of the structure are obtained.Based on the analysis of dynamic characteristics,an aeroelastic model with 1/50 scale is tested.Wind-induced responses under Davenport wind speed spectrum and consequently dynamic load of the structure are all acquired.Wind-induced vibration coefficients according to test results,Load Code and random vibration theory are calculated and compared with each other.Results show that the recommended coefficient and its theoretic calculation method can reflect the variety of structure figure and agree well with the wind tunnel test results.

关 键 词：钢管输电塔 风洞试验 风振系数 体型系数 

分 类 号：TU347[建筑科学—结构工程] TU311.3