Safety of the express freight train running over a long-span bridge  

作　　者：Jingcheng Wen Yihao Qin Ye Bai Xiaoqing Dong 

机构地区：[1]Locomotive and Car Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing,China

出　　处：《Railway Sciences》2024年第4期469-479,共11页铁道科学（英文）

基　　金：supported by the Research Major Project of China Academy of Railway Sciences Group Co.,Ltd(Grant No.2021YJ270);the China National Railway Group Science and Technology Program(Grant No.N2022T001).

摘　　要：Purpose-Express freight transportation is in rapid development currently.Owing to the higher speed of express freight train,the deformation of the bridge deck worsens the railway line condition under the action of wind and train moving load when the train runs over a long-span bridge.Besides,the blunt car body of vehicle has poor aerodynamic characteristics,bringing a greater challenge on the running stability in the crosswind.Design/methodology/approach-In this study,the aerodynamic force coefficients of express freight vehicles on the bridge are measured by scale model wind tunnel test.The dynamic model of the train-long-span steel truss bridge coupling system is established,and the dynamic response as well as the running safety of vehicle are evaluated.Findings-The results show that wind speed has a significant influence on running safety,which is mainly reflected in the over-limitation of wheel unloading rate.The wind speed limit decreases with train speed,and it reduces to 18.83 m/s when the train speed is 160 km/h.Originality/value-This study deepens the theoretical understanding of the interaction between vehicles and bridges and proposes new methods for analyzing similar engineering problems.It also provides a new theoretical basis for the safety assessment of express freight trains.

关 键 词：Express freight train Long-span bridge CROSSWIND Wind tunnel test Running safety Paper type Research paper 

分 类 号：U29[交通运输工程—交通运输规划与管理]