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Dynamic Characteristics of Railway Structures under High-Speed Train Loading

고속열차 주행 시 동적하중을 받는 철도구조물의 진동 특성

  • Rhee, Inkyu (Department of Civil Engineering, Chonnam National Univ.) ;
  • Kim, Jae Min (Department of Civil Engineering, Chonnam National Univ.)
  • 이인규 (전남대학교 토목공학과) ;
  • 김재민 (전남대학교 토목공학과)
  • Received : 2020.01.09
  • Accepted : 2020.01.29
  • Published : 2020.04.30

Abstract

The purpose of this study is to investigate the distribution patterns of displacement and acceleration fields in a nonlinear soil ground based on the interaction of high-speed train, wheel, rail, and ground. For this purpose, a high-speed train in motion was modeled as the actual wheel, and the vertical contact of wheel and rail and the lateral contact, caused by meandering motion, were simulated; this simulation was based on the moving mass analysis. The soil ground part was given the nonlinear behavior of the upper ground part by using the modified the Drucker-Prager model, and the changes in displacement and acceleration were compared with the behavior of the elastic and inelastic grounds. Using this analysis, the displacement and acceleration ranges close to the actual ground behavior were addressed. Additionally, the von-Mises stress and equivalent plastic strain at the ground were examined. Further, the equivalent plastic and total volumetric strains at each failure surface were examined. The variation in stresses, such as vertical stress, transverse pressure, and longitudinal restraint pressure of wheel-rail contact, with the time history was investigated using moving mass. In the case of nonlinear ground model, the displacement difference obtained based on the train travel is not large when compared to that of the elastic ground model, while the acceleration is caused to generate a large decrease.

Acknowledgement

Supported by : 에너지기술평가원

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