基于位移测量的输电塔等效静风荷载研究

EQUIVALENT STATIC WIND LOAD OF TRANSMISSION TOWER BASED ON DISPLACEMENT MEASUREMENT

以输电塔气弹模型为试验对象,基于非接触式精密位移测量系统,在风洞中测量了不同风向、风速下输电塔的位移响应。采用荷载响应相关法,建立了基于输电塔气弹模型位移响应的等效静风荷载试验分析方法。结果表明:输电塔在两轴向的风振响应均以一阶模态为主,且顺风向的脉动响应要大于横风向;计算得到的输电塔顺风向等效荷载要远大于横风向,且顺风向等效荷载中平均量占优,背景次之,共振不显著;对比分析显示,该文所建立的输电塔等效静风荷载试验分析方法合理、有效。

Based on a non-contact precision displacement measurement system, the displacement response of a transmission tower under different wind directions and wind speed are measured with an aeroelastic model by wind tunnel experiments. And the experiment analysis method for estimating an equivalent static wind load（ESWL） are further deduced based on the displacement response of a transmission tower with the load-response-correlation method. The results show that the wind-induced respond of a transmission tower in both two axes is dominated by the first-order modal, and that the along-fluctuating response is more prominent than the across-wind response. The ESWL for a transmission tower in the along-wind direction, calculating by the proposed method, is considerably larger than that in the across-wind direction; the average amount of ESWL in the along-wind direction is dominant, the second in the background, and there is no significant contribution to ESWLs for a resonant response. The comparative result indicates that the proposed method for estimating ESWL of a transmission tower is reasonable and feasible.