1000kV双回路特高压输电塔顺风向等效静风荷载研究

Equivalent Along-Wind Direction Static Wind Load of Transmission Tower for 1 000 kV Double Circuit Transmission Lines on Same Tower

基于高频动态天平测力试验,研究了1000kV双回路特高压输电塔的等效静力风荷载。基于准定常理论和不同高度的脉动风荷载无量纲自功率谱相等的假设,得到了塔身不同高度处的风荷载自谱和互谱。分别计算了输电塔风偏角为0°和90°时的等效背景风荷载、等效共振风荷载和总等效静风荷载,给出了不同高度处的阵风效应因子,可为特高压输电塔的风荷载计算提供依据。

Based on the test of high frequency force balance （HFFB）, the equivalent static wind load of 1 000 kV double circuit transmission lines on same tower is researched. According to quasi-steady theory and the assumption that the non-dimensional self-power spectrunas of the wind loads in different heights are equal, the self-power spectrums and the cross-power spectrums of the wind load at different heights of tower body are obtained. The equivalent background wind load, the equivalent resonant wind load and total equivalent static wind load of transmission tower under windage yaw angle of 0~ and 90~ are calculated respectively, and the gust effect factors at different heights under the two windage yaw angles are given. Results of this research are available for reference to wind load calculation of such kinds of transmission towers for UHV power transmission projects.