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Structural Engineering and Mechanics Volume 77, Number 5, March 2021 , pages 627-635 DOI: https://doi.org/10.12989/sem.2021.77.5.627 |
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A model for investigating vehicle-bridge interaction under high moving speed |
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Hanyun Liu, Zhiwu Yu, Wei Guo and Yan Han
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Abstract | ||
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 | ||
Address | ||
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 | ||