基于天平测力试验的两种典型大跨越输电塔体型系数研究

SHAPE COEFFICIENTS ANALYSIS OF TWO TYPICAL LONG-SPAN TRANSMISSION TOWERS BASED ON HFFB TEST

选取1 000 k V特高压交流输变电工程线路中大跨越输电塔,通过高频测力天平风洞试验,得到不同风速和风向角下两种典型大跨越输电塔的体型系数,并与相关规范值进行对比。研究结果表明,不同高度的大跨越输电塔体型系数受风速的影响不同;大跨越输电塔的体型系数随风向角的增大呈现先增加后减小的趋势,其最大值发生在15°风向角;大跨越输电塔体型系数实测值比规范值要大,通过高频测力天平风洞试验确定结构的体型系数是更安全的。

Based on the 1 000 k V ultra-high voltage electric power transmission project,the high frequency force balance（HFFB） test in wind-tunnel was conducted. The shape coefficients of two typical transmission towers were obtained under different wind attack angles and wind speeds and compared with the values calculated by the Chinese load code. The results showed that the effects of the wind speed on the shape coefficient of long-span transmission towers with different heights were different. The shape coefficient increased first and then decreased gradually with the increase of the wind attack angle. The maximum value of shape coefficient was created at the wind attack angle of 15 degrees. The shape coefficients obtained from tests were larger than the values calculated by the Chinese load code. So it is safer to obtain the shape coefficient of the structure through the high frequency force balance（HFFB） test than through the Chinese load code.