Structural Engineering and Mechanics

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A model for investigating vehicle-bridge interaction under high moving speed

  • Liu, Hanyun (School of Civil Engineering, Changsha University of Science & Technology) ;
  • Yu, Zhiwu (Department School of Civil Engineering, Central South University) ;
  • Guo, Wei (Department School of Civil Engineering, Central South University) ;
  • Han, Yan (School of Civil Engineering, Changsha University of Science & Technology)
  • Received : 2019.12.03
  • Accepted : 2020.12.30
  • Published : 2021.03.10
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Abstract

The speed of rail vehicles become higher and higher over two decades, and China has unveiled a prototype high-speed 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.

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References

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