既有桥梁对相邻车&mdash;桥系统气动力的影响分析

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (4) : 51-57.

论文

既有桥梁对相邻车—桥系统气动力的影响分析

严乃杰1,2，吴韬3，臧瑜4，李永乐2，郑博文3，戴建国4

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A study on the effect of an existing bridge on the aerodynamic forces of an adjacent vehicle-bridge system

YAN Naijie1,2，WU Tao3，ZANG Yu4，LI Yongle2，ZHENG Bowen3，DAI Jianguo4

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摘要

为了研究既有桥梁对相邻车—桥系统气动力的影响，通过节段模型风洞试验，测试了考虑、不考虑既有桥梁干扰工况下相邻车—桥系统的气动力系数，数值模拟了作用在车—桥系统上的抖振力时程，并计算了抖振力极值。结果表明：既有桥梁对相邻车—桥系统气动力的影响显著，导致部分工况下列车、桥梁的气动力显著增大，结构设计中应充分考虑邻近桥梁的气动影响；车—桥系统中列车的气动力受既有桥梁的影响更大；受既有桥梁影响，不同工况下，列车横向力系数最大增幅、减幅分别为39.3%和-143.1%，列车升力系数最大增幅、减幅分别为52%和-68.2%；不同工况下桥梁阻力系数均减小，且最大减幅为-22.4%；迎风侧列车抖振横向力、抖振升力幅值均显著增大，背风侧列车抖振力幅值变化相对较小；桥梁抖振力阻力幅值减小，抖振升力和抖振升力矩幅值略有增大；列车抖振横向力、抖振升力的极值增幅分别为35%和67%；桥梁抖振阻力的极值减幅为-22.9%，抖振升力、抖振升力矩的极值增幅分别为48.5%和37.5%。

Abstract

In order to investigate the effect of an existing bridge on the aerodynamic forces of an adjacent vehicle-bridge system, the aerodynamic coefficients of a new-built vehicle-bridge system were tested by a section model wind tunnel test with taking into account an existing bridge or not.The time histories of buffeting forces loading on the vehicle-bridge system were numerically simulated, and the extreme values of buffeting forces were calculated.The results show that the existing bridge has remarkable effect on the aerodynamic forces of the adjacent vehicle-bridge system, which results in the obvious increase of aerodynamic forces of the vehicle and the bridge in the same cases.The effect of the existing bridge on the adjacent vehicle-built system should be considered in the process of structure design.The existing bridge has greater effect on the vehicle than on the bridge.Due to the influence of the existing bridge, the maximum increment and decrement of side force coefficient of the vehicle are 39.3% and -143.1%, respectively.The maximum increment and decrement of lift force coefficient of vehicle are 52% and -68.2%, respectively.The drag force coefficients of the bridge all decrease in different cases, and the maximum decrement is -22.4%.The amplitudes of buffeting side force and buffeting lift force of the windward vehicle increase obviously, and the amplitudes of buffeting forces of the leeward vehicle change slightly.The amplitude of buffeting drag force of the bridge all decrease, and the amplitude of buffeting lift force and buffeting lifting moment increase slightly.The increment of extreme value of the buffeting side force and buffeting lift force of the vehicle are 35% and 67% respectively.The decrement of the extreme value of buffeting drag force of the bridge is -22.9%, and the increment of the extreme value of buffeting lifting force and buffeting lifting moment are 48.5% and 37.5% respectively.

导出引用

严乃杰1,2，吴韬3，臧瑜4，李永乐2，郑博文3，戴建国4. 既有桥梁对相邻车—桥系统气动力的影响分析[J]. 振动与冲击, 2021, 40(4): 51-57

YAN Naijie1,2，WU Tao3，ZANG Yu4，LI Yongle2，ZHENG Bowen3，DAI Jianguo4. A study on the effect of an existing bridge on the aerodynamic forces of an adjacent vehicle-bridge system[J]. Journal of Vibration and Shock, 2021, 40(4): 51-57

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