角度风作用下角钢输电塔头风荷载风洞试验研究  

Wind Tunnel Test for Wind Loads of an Angle Steel Transmission Tower Head under Skew Winds

作　　者：李超[1] 胡晓依[1] 宋雪祺 邓洪洲[1] LI Chao;HU Xiaoyi;SONG Xueqi;DENG Hongzhou(Department of Structural Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《结构工程师》2022年第6期119-125,共7页Structural Engineers

基　　金：国家自然科学基金项目(51578421)。

摘　　要：对±1000 kV准东-华东特高压直流输电线路角钢塔的塔头模型进行了风洞试验,利用高频测力天平技术研究了塔头模型在角度风作用下的气动力特性。通过逐个拆除横担的方法(间接测量法),分别获得了塔头左右两个横担的气动力系数、角度风系数和荷载分配系数。结果表明:角度风作用下横担阻力系数的最不利风向角为10°,升力系数最不利风向角为30°;塔头左右两个横担的角度风系数在0°~75°风向角范围内比较接近,但在75°~90°风向角下处于下游横担的角度风系数明显小于处于上游横担的角度风系数;荷载分配系数不宜直接通过将角度风系数按风向角分解得到,横向升力的影响不可忽略;根据试验结果给出了角度风系数的拟合公式,可为实际工程设计提供依据。A wind tunnel test was carried out for the tower head of an angle-steel transmission tower in the Zhundong-East China ±1000 kV UHV DC transmission line. The technique of high frequency force balance was employed to study the aerodynamic characteristics of the tower head model under skew winds. Through the indirect force measurement method, the aerodynamic coefficients, skew wind load factors and load distribution factors of the two cross-arms were obtained, respectively. The results reveal that, under skew winds, the most unfavorable condition for the drag coefficient of a cross-arm is wind direction 10°, and the most unfavorable condition for lift coefficient is 30°;the skew wind load factors of the two cross-arms in a tower head are close under wind direction 0°~75°, while under wind direction 75°~90°, the skew wind load factors of the downstream cross-arm are obviously smaller than those of the upstream cross-arm;the load distribution factor should not be obtained directly by decomposing the skew wind load factor according to the wind direction, the effects of lift should not be neglected;based on the test results, fitting equations of the skew wind load factor were proposed, which can provide references for practical engineering designs.

关 键 词：输电塔 风荷载 风洞试验 角度风 高频测力天平 

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