A study on the effect of an existing bridge on the aerodynamic forces of an adjacent vehicle-bridge system
YAN Naijie1,2，WU Tao3，ZANG Yu4，LI Yongle2，ZHENG Bowen3，DAI Jianguo4
1.Railway Engineering Research Institute, China Academy of Railway Science Co., Ltd., Beijing 100081, China;
2.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
3.Chongqing Rail Transit (Group) Co., Ltd., Chongqing 401120, China;
4.Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China
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.
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 Naijie1,2，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. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(4): 51-57.
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