路堤-桥梁过渡段车辆气动力风洞试验研究
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北京交通大学 土木建筑学院

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TU375.4

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Experimental analysis of Vehicle Aerodynamic Force in Embankment-Bridge Transition Section
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School of Civil Engineering,Beijing Jiaotong University,Shangyuancun ,Haidian District

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    摘要:

    为了探究路堤桥梁过渡段处车辆的气动力,本文建立了1:50的大比例尺路堤-桥梁过渡段和车辆实验模型,其中在桥梁和路堤段分别布置了两种风屏障,并在车辆模型表面布置多个测压点,以研究不同防风措施下,处于不同风向角的路桥过渡段车辆气动力。试验结果表明:相比于无防风措施时,布置桥梁风屏障后最不利风向角会从-15°改变为0°,此风向下过渡段处车辆的三分力最大;再进一步布置路堤风屏障后最不利风向角不变,但大幅减小了0°风向角下车辆的侧立系数和力矩系数;布置路堤风屏障能有效的减小车辆所受三分力;不同风向角,改变陆地风屏障参数所产生的影响并不相同,针对路堤-桥梁过渡段布置防风措施时,应充分考虑其来流方向,以达到最优效果。

    Abstract:

    In order to explore the aerodynamic force of vehicles at the transition section of embankment and bridge, a 1:50 large-scale embankment-bridge transition section and vehicle experimental model are established in this paper. Two kinds of wind barriers are arranged in the bridge and embankment sections, and multiple pressure measuring points are arranged on the surface of the vehicle model to study the aerodynamic force of vehicles in the embankment-bridge transition section at different wind directions under different windproof measures. The experiment results show that compared with no wind-proof measures, the most unfavorable wind direction angle after the arrangement of the bridge wind barrier will change from -15° to 0°, and the three-component force of the vehicle at the transition section under this wind direction is the largest. After further arrangement of embankment wind barrier, the most unfavorable wind direction angle remains unchanged, but the lateral coefficient and torque coefficient of the vehicle at 0° wind direction angle are greatly reduced. The arrangement of embankment wind barrier can effectively reduce the three-component force of vehicles; the influence of changing the parameters of land wind barrier is not the same in different wind directions. The direction of incoming flow should be fully considered in the arrangement of windbreak measures for embankment-bridge transition section to achieve the optimal effect.

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  • 收稿日期:2021-10-22
  • 最后修改日期:2022-01-28
  • 录用日期:2022-02-23
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