Steel and Composite Structures

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Running safety of high-speed train on deformed railway bridges with interlayer connection failure

  • Gou, Hongye (Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University) ;
  • Liu, Chang (Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University) ;
  • Xie, Rui (Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University) ;
  • Bao, Yi (Department of Civil, Environmental and Ocean Engineering, Stevens Institute of Technology) ;
  • Zhao, Lixiang (Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University) ;
  • Pu, Qianhui (Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University)
  • Received : 2019.11.26
  • Accepted : 2021.04.15
  • Published : 2021.05.10
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Abstract

In a railway bridge, the CRTS II slab ballastless track is subjected to interlayer connection failures, such as void under slab, mortar debonding, and fastener fracture. This study investigates the influences of interlayer connection failure on the safe operation of high-speed trains. First, a train-track-bridge coupled vibration model and a bridge-track deformation model are established to study the running safety of a train passing a deformed bridge with interlayer connection failure. For each type of the interlayer connection failure, the effects of the failure locations and ranges on the track irregularity are studied using the deformation model. Under additional bridge deformation, the effects of interlayer connection failure on the dynamic responses of the train are investigated by using the track irregularity as the excitation to the vibration model. Finally, parametric studies are conducted to determine the thresholds of additional bridge deformations considering interlayer connection failure. Results show that the interlayer connection failure significantly affects the running safety of high-speed train and must be considered in determining the safety thresholds of additional bridge deformation in the asset management of high-speed railway bridges.

Keywords

Acknowledgement

The research was funded by the National Natural Science Foundation of China (Grant No. 51878563), the Sichuan Science and Technology Program (Grant No. 2018JY0294 and 2018JY0549), and the Ministry of Science and Technology of China (Grant No. KY201801005).

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