风屏障对平层公铁桥上列车防风效果分析
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U448.12

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国家自然科学优秀青年基金项目(51822803)


Study on the protective effects of wind barriers on the train on highway and railway same-story bridge
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    摘要:

    为探讨风屏障的防风效果,对侧风作用下平层公铁桥梁?列车?风屏障系统气动特性进行了风洞试验研究, 针对两类风屏障的不同透风率和高度对不同风偏角下桥上中间列车的三分力系数进行测试,研究了风屏障在不同 风偏角下的倾覆力矩系数的折减系数。研究结果表明:风屏障在桥面上安装位置不同,对列车气动力特性影响有 明显区别;设置风屏障能够有效减小作用在车辆上的三分力系数,给桥上列车提供更有利的行驶环境;风屏障的 透风率比高度对列车气动特性的影响要大。无风屏障作用时,侧风下单车上游时列车的倾覆力矩系数最大,受风 荷载影响最显著。由于上游车的挡风作用,双车交会时下游列车三分力系数较小,受风屏障和风偏角影响也较小。 风偏角在 0°~15°时,风屏障透风率和高度对风屏障防风效果影响不明显;风偏角 60°≤β≤90°时,设置风屏障 A 的风速折减率要大于设置风屏障 B 的,防风效果更佳。

    Abstract:

    To investigate the protective effect of the wind barrier, the wind tunnel test was carried out on the aerodynamic characteristics of highway and railway same-story bridge wind barrier system under the action of crosswind. For the two types of wind barriers, the three-component force coefficient of the vehicles in the middle of the bridge under different wind deflections was tested with different wind rates and heights, and the wind speed reduction coefficient of the wind barrier under different wind deflections was studied. The results show that the installation position of the wind barrier on the bridge deck is different, which has a significant difference on the vehicle aerodynamic coefficient. The wind barrier can effectively reduce the lateral wind load on the vehicles and provide a more favorable driving environment for the vehicles on the bridge. The influence of the wind barrier permeability on the aerodynamic characteristics of the train is greater than that of the height of the wind barrier. When there is no wind barrier, the overturning moment coefficient of single vehicle upstream is the largest, and it is most significantly affected by wind load. Because of the wind effect of upstream vehicle, the three-component force coefficient of downstream train is smaller when two vehicles meet, and it is also less affected by wind barrier and wind deflection angle. When the wind deflection angle is 0°~15°, the air permeability and height of the wind barrier have no obvious effect on the wind protection effect. Under the wind deflection angle (60°≤β≤90°), the reduction rate of wind speed for setting the windbarrier A is greater than that for the wind barrier B, so the wind prevention effect is better.

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  • 在线发布日期: 2022-06-06
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