大跨越输电塔线体系气弹模型风洞试验

Wind tunnel test on aeroelastic model of long span transmission line system

针对大跨越输电塔线耦合体系的风振响应问题,以规划中的世界第一高塔——某大跨越输电塔线工程为原型,采用离散刚度法设计制作了塔线体系的气弹模型,并在紊流风场中进行了多个风向角、多个风速下的单塔和塔线体系气弹模型风洞试验.试验结果表明,输电塔的响应可以分解为共振响应与背景响应.通过分析塔线耦合作用对输电塔2部分分量的影响,揭示了塔线体系的风振响应特性.塔线体系与单塔相比,由于阻尼的增加导致共振响应有所降低,而迎风面积的增大使得背景响应有较大幅度的提高.分析塔线体系总的风振响应必须同时考虑塔线耦合作用对2部分分量的影响.

An aeroelastic model was designed with discrete stiffness method to investigate the wind-induced dynamic response of long span transmission line system. Prototype structure was the tallest transmission tower in the world, which was a part of a long span transmission line system. The wind tunnel tests of the single tower model and tower-line system model were conducted with different wind directions and velocities in the turbulent flow. According to the experimental results, the wind-induced dynamic response of the tower can be divided into two parts： background response and resonant response. Then the characteristics of wind-induced dynamic response of the long span transmission line system were analyzed. Compared with the single tower, the existence of the lines decreases the resonant response of the tower-line system because of the rising damp and increases the background response along with the increment of front face area. The different influence of the tower-line coupled effects on the two parts of response must be considered at the same time in calculation of the dynamic response.