Steel and Composite Structures

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Reliability of mortar filling layer void length in in-service ballastless track-bridge system of HSR

  • Binbin He (School of Civil Engineering and Architecture, East China Jiaotong University) ;
  • Sheng Wen (School of Civil Engineering and Architecture, East China Jiaotong University) ;
  • Yulin Feng (School of Civil Engineering and Architecture, East China Jiaotong University) ;
  • Lizhong Jiang (Central South University, National Engineering Research Center of High-speed Railway Construction Technology) ;
  • Wangbao Zhou (Central South University, National Engineering Research Center of High-speed Railway Construction Technology)
  • Received : 2022.10.25
  • Accepted : 2023.03.16
  • Published : 2023.04.10
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Abstract

To study the evaluation standard and control limit of mortar filling layer void length, in this paper, the train sub-model was developed by MATLAB and the track-bridge sub-model considering the mortar filling layer void was established by ANSYS. The two sub-models were assembled into a train-track-bridge coupling dynamic model through the wheel-rail contact relationship, and the validity was corroborated by the coupling dynamic model with the literature model. Considering the randomness of fastening stiffness, mortar elastic modulus, length of mortar filling layer void, and pier settlement, the test points were designed by the Box-Behnken method based on Design-Expert software. The coupled dynamic model was calculated, and the support vector regression (SVR) nonlinear mapping model of the wheel-rail system was established. The learning, prediction, and verification were carried out. Finally, the reliable probability of the amplification coefficient distribution of the response index of the train and structure in different ranges was obtained based on the SVR nonlinear mapping model and Latin hypercube sampling method. The limit of the length of the mortar filling layer void was, thus, obtained. The results show that the SVR nonlinear mapping model developed in this paper has a high fitting accuracy of 0.993, and the computational efficiency is significantly improved by 99.86%. It can be used to calculate the dynamic response of the wheel-rail system. The length of the mortar filling layer void significantly affects the wheel-rail vertical force, wheel weight load reduction ratio, rail vertical displacement, and track plate vertical displacement. The dynamic response of the track structure has a more significant effect on the limit value of the length of the mortar filling layer void than the dynamic response of the vehicle, and the rail vertical displacement is the most obvious. At 250 km/h - 350 km/h train running speed, the limit values of grade I, II, and III of the lengths of the mortar filling layer void are 3.932 m, 4.337 m, and 4.766 m, respectively. The results can provide some reference for the long-term service performance reliability of the ballastless track-bridge system of HRS.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (52268074, 52078487), the Fellowship of China Postdoctoral Science Foundation (Grant 2022M713544), the State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure (HJGZ20212009, HJGZ2021211), and Jiangxi Provincial Natural Science Foundation (20224BAB214073).

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