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针对输电塔架中应用范围最为广泛的酒杯型塔架,不同规范给出不同的风振系数计算方法.本文基于随机振动理论采用Davenport谱模拟脉动风,在ANSYS环境中对塔架有限元模型进行风振时程分析,从而得到模拟风振系数结果;并将模拟结果与规范运算结果进行对比分析,得到不同高度的输电塔架的风振系数变化规律.结果表明,在塔身部分三种规范及模拟结果都十分接近;对其曲臂及横担处,规范公式凸显不足,应该考虑刚度突变引起的此处风振系数变化.
According to the random vibration theory, Davenport spectrum is used to simulate the fluctuating wind and the finite element model of the tower is carried out in the ANSYS environment for the wine glass tower with the widest range of application in the transmission tower. Wind-induced vibration time-history analysis, the simulation wind-induced vibration coefficient results are obtained, and the simulation results are compared with the standard operation results to get the variation law of the wind-induced vibration coefficients of the different height transmission towers.The results show that in the three parts And the simulation results are very close; for its crank arm and cross arm place, the standard formula is not enough, so the change of wind-induced vibration coefficient should be considered here.