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Structural Engineering and Mechanics
  Volume 77, Number 5, March 2021 , pages 627-635

A model for investigating vehicle-bridge interaction under high moving speed
Hanyun Liu, Zhiwu Yu, Wei Guo and Yan Han

    The speed of rail vehicles become higher and higher over two decades, and China has unveiled a prototype highspeed train in October 2020 that has been able to reach 400 km/h. At such high speeds, wheel-rail force items that had previously been ignored in common computational model should be reevaluated and reconsidered. Aiming at this problem, a new model for investigating the vehicle-bridge interaction at high moving speed is proposed. Comparing with the common model, the new model was more accurate and applicable, because it additionally considers the second-order pseudo-inertia forces effect and its modeling equilibrium position was based on the initial deformed curve of bridge, which could include the influences of temperature, pre-camber, shrinkage and creep deformation, and pier uneven settlement, etc. Taking 5 km/h as the speed interval, the dynamic responses of the classical vehicle-bridge system in the speed range of 5 km/h to 400 km/h are studied. The results show that ignoring the second-order pseudo-inertia force will underestimate the dynamic response of vehicle-bridge system and make the high-speed railway bridge structure design unsafe.
Key Words
    vehicle-bridge interaction; high moving speed; high-speed railway; bridge initial deformation; wheel-rail contact force; peak dynamic response
Hanyun Liu, Yan Han: School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China
Zhiwu Yu, Wei Guo: DepartmentSchool of Civil Engineering, Central South University, Changsha 410075, China; National Engineering Laboratory of High-Speed Railway Construction Technology, Changsha 410075, China

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