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LI Yong-le, XU Xin-yu, YAN Nai-jie, DENG Jiang-tao, XIANG Huo-yue. Comparison of wind-vehicle-bridge coupling vibration characteristics for three-line three-tower suspension bridge[J]. Journal of Traffic and Transportation Engineering, 2015, 15(6): 17-25. doi: 10.19818/j.cnki.1671-1637.2015.06.003
Citation: LI Yong-le, XU Xin-yu, YAN Nai-jie, DENG Jiang-tao, XIANG Huo-yue. Comparison of wind-vehicle-bridge coupling vibration characteristics for three-line three-tower suspension bridge[J]. Journal of Traffic and Transportation Engineering, 2015, 15(6): 17-25. doi: 10.19818/j.cnki.1671-1637.2015.06.003
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Comparison of wind-vehicle-bridge coupling vibration characteristics for three-line three-tower suspension bridge

doi: 10.19818/j.cnki.1671-1637.2015.06.003

  • School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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  • Author Bio:

    LI Yong-le（1972-），male，professor，PhD，+86-28-87601119，lele@swjtu.edu.cn

  • Received Date: 2015-07-08
  • Publish Date: 2015-12-25
    Abstract
  • Taking the two design schemes(steel-box-truss and steel-truss schemes)of a three-line three-tower suspension bridge as the research object, the three-component coefficients of forces for vehicle and bridge were obtained by the wind tunnel tests of vehicle-bridge system section model.Based on the spatial dynamics model of wind-vehicle-bridge(WVB)system, the dynamic characteristics of bridge and the coupling vibration characteristics of WVB system were analyzed by using the self-developed software BANSYS. Analysis result indicates that the natural frequencies of three-line three-tower suspension bridge are comparatively low.The aerodynamic characteristics of vehicle were greatly affected by track position, and the drag coefficient of windward vehicle for the steel-truss scheme is about 2.2 times that for the steel-box-truss scheme.When wind speed is 0, the dynamic responses of bridge and vehicle increase with the increase of vehicle speed.The displacements of bridge for the steel-truss scheme are bigger than those for the steel-box-truss scheme at the same vehicle speed, which is resulted from the weaker whole stiffness for the steel-truss scheme.When wind speed is considered, the lateral responsesof bridge greatly increase with wind speed increasing.When vehicle is running on the windward side and wind speed increases from 15m·s-1 to 25m·s-1, the lateral displacements of bridge for the steel-box-truss and steel-truss schemes enlarge to approximate 2.4 times and 3.8 times respectively, and crosswind is dominant to the lateral responses of bridge.On the whole, the bridge responses for the steel-truss scheme are larger than those for the steel-box-truss scheme under the same wind speed.As for the same scheme, vehicle responses increase with wind speed increasing.When wind speed reaches 25 m·s-1, the dynamic responses remarkably increase, and the maximum response index increases by 71.6% compared with that at the wind speed of 15m·s-1.

     

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