Steel and Composite Structures

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Mapping vertical bridge deformations to track geometry for high-speed railway

  • Gou, Hongye (Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University) ;
  • Ran, Zhiwen (Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University) ;
  • Yang, Longcheng (Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University) ;
  • Bao, Yi (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 : 2018.09.19
  • Accepted : 2019.07.30
  • Published : 2019.08.25
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Abstract

Running safety and ride comfort of high speed railway largely depend on the track geometry that is dependent on the bridge deformation. This study presents a theoretical study on mapping the bridge vertical deformations to the change of track geometry. Analytical formulae are derived through the theoretical analysis to quantify the track geometry change, and validated against the finite element analysis and experimental data. Based on the theoretical formulae, parametric studies are conducted to evaluate the effects of key parameters on the track geometry of a high speed railway. The results show that the derived formulae provide reasonable prediction of the track geometry change under various bridge vertical deformations. The rail deflection increases with the magnitude of bridge pier settlement and vertical girder fault. Increasing the stiffness of the fasteners or mortar layer tends to cause a steep rail deformation curve, which is undesired for the running safety and ride comfort of high-speed railway.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Ministry of Science and Technology of China

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