In light of basic scale laws, a fine aero-elastic model of angle steel transmission tower was designed and fabricated. Based on transit typhoon meteorological data and typhoon field model, wind field parameters of the object site were determined. Wind tunnel vibration tests under terrain B wind field and typhoon one were performed for comparison. By analyzing the measured acceleration responses and power spectrum, wind-induced vibration characteristics of angle steel transmission tower in typhoon field were studied. The results are as follows. Wind-induced vibration responses of the angle steel transmission tower in two types of wind field mentioned are similar. In addition to bending vibration of the whole tower, torsional vibration of the tower top is apparent in various wind directions, contributing to the acceleration response measured at arm end a-bout 2 times of the same height at the tower, so special attention should be paid to the wind-induced torsional vibration effects of angle steel transmission towers . Besides, the accelerations along the wind direction in typhoon field ?? are significantly higher than those in terrain B wind field owing to its higher fluctuation characteristic, with the ratio of about 1.4, but the magnification effect in transverse direction is not apparent, which shows that the wind-induced responses are mainly correlated with the structure characteristic turbulence and weakly correlated with the turbulence of the wind.%按照相似准则,设计制作了精细的角钢输电塔气弹模型,基于过境台风气象资料和台风风场模型确定了工程所在地区的风场参数,并进行了B类风场和台风风场的测振对比试验,研究了台风风场作用下角钢塔的风振特性.试验结果表明:两类风场作用下,角钢塔的风振特性基本相似,各风向角下除了塔身整体双向弯曲振动外,还伴随了较明显的塔头扭转振动,导致各工况下横担端部测点的加速度响应约为相近高度塔身的1.56～2.45倍,因此长横担角钢输电塔的风致扭转振动值得注意；相比B类风场,台风风场的高湍流特性导致顺风向风振响应增大明显,为B类风场的1.3～1.6倍,但横风向风振响应增大并不明显,这也说明横风向风振响应主要与结构本身特征湍流相关,与来流的湍流度相关性较弱.
展开▼
