单杆输电塔气弹模型风洞试验研究和理论分析

Wind tunnel test and theoretical analysis on aeroelastic model of single-rod transmission tower

针对高耸单杆输电塔结构风致响应较大的特点,进行了气动弹性模型的风洞试验,以研究在不同风速下的气动响应.模型分不挂导线和挂导线两种情况,分别测定了在模拟紊流流场中的顺风向和横风向振动响应,以及在均匀流场中的气动系数,在此基础上得到的最大加速度、最大位移、横风向与顺风向响应的比例以及导线的阻尼作用大小等数据,可作为结构设计的依据.此外,在时域内用三角级数叠加法和Newmark法,在频域内用功率谱积分法,分别对该结构的风致响应进行了理论分析和计算,将计算结果与试验结果进行了比较分析,验证了试验的正确性.

As to the characteristic of large wind-induced response, an aeroelastic model of single-rod transmission tower was tested in a wind tunnel to study its response to different wind velocity. Under different circumstances with and without wires, the dynamic along-wind response and across-wind response in the turbulence flow and the aerodynamic force coefficients in the laminar flow were measured respectively, on the basis of that, the maximum acceleration, displacement, the proportion of across-wind response to along-wind response and the damping effect of wires were obtained, all of which can be used in structure design. Furthermore, the dynamic response was calculated with triangle series superposition method and Newmark method in time domain and with the power spectrum integral method in frequency domain respectively. The results were compared and the accuracy of the test was verified.