中文摘要：

针对某拟建大跨度山区超高（塔高328m）多肢斜拉桥,采用缩尺比为1∶225的刚性模型进行风洞测压试验,研究整塔与各分肢节段气动力系数随风偏角和风速的变化规律。结果表明：塔柱间干扰效应会引起气动力系数的雷诺数效应增强,阻力系数随雷诺数的增大缓慢增大,升力和扭矩系数变化复杂,会在某一定风偏角下随雷诺数呈类正弦函数关系变化;整体气动力系数受多肢干扰影响,阻力系数有所增大,而升力和扭矩系数减小;多肢干扰效应会明显增大气动力系数（最大可使局部肢柱阻力系数增大约2倍）,进行整体和局部肢柱气动力分析时均应充分考虑;肢柱干扰效应导致阻力和升力系数的最不利风偏角一般位于截面整体外轮廓对角线与横桥向和顺桥向的夹角范围内,当肢柱间距较小时,其变化趋势同独柱节段,在0°风偏角时阻力系数最大。

英文摘要：

In view of a large span ultrahigh（tower 328m）multi-limb cable-stayed bridge proposed to be built in mountainous area,wind tunnel pressure test was carried out through a 1∶225scale rigid model to study the change law for the aerodynamic coefficients both of the whole tower and different limb segments with wind yaw angle and wind speed.Results show that multi-limb interference may enhance the Reynolds number effect of aerodynamic coefficient.The drag coefficient increases slowly with the increase of Reynolds number.The change of lift coefficient and torque coefficient is complicated,and shows a sinusoidal function change with Reynolds number at a certain wind yaw angle.The overall aerodynamic coefficient is affected by multi-limb interference.The drag coefficient increases while the lift and torque coefficients decrease.The effect of multi-limb interference will significantly increase the aerodynamic coefficient（the drag coefficient of the local limb segment can be increased by about 2times at most）,which should be fully considered when analyzing the aerodynamic forces of both the overall and local limb segments.The most unfavorable wind yaw angle of drag and lift coefficients caused by the interference effect of limb segment is generally located in the included angle of the overall diagonal of cross section and transverse and longitudinal direction of bridge.When the spacing between two limb segments is small,the change trend is similar to that of single-limb segment,and the maximum drag coefficient appears at the wind yaw angle of 0degree.