Vertical Nonlinear Temperature Gradient and Temperature Load Mode of Ballastless Track in China

Bin Yan, Ruiqi Cheng, Haoran Xie and Xiangmin Zhang
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Bin Yan: School of Civil Engineering, Central South University, Changsha 410075, China
Ruiqi Cheng: School of Civil Engineering, Central South University, Changsha 410075, China
Haoran Xie: China Railway Design Corporation, Tianjin 300308, China
Xiangmin Zhang: School of Civil Engineering, Central South University, Changsha 410075, China

Mathematics, 2022, vol. 10, issue 1, 1-15

Abstract: In the process of heat exchange with the external environment, the internal temperature of ballastless track structure presents a nonlinear distribution. The vertical temperature gradient will cause repeated warping and deformation of track slab, resulting in mortar layer separation, which will affect driving comfort and track durability. The traditional temperature field analysis method of concrete structure based on thermodynamics has the disadvantages of too many assumptions, difficult parameter selection and too much calculation of energy consumption. In this paper, based on the finite element software ANSYS, the heat exchange was transformed into the boundary condition of heat flux, which was applied to the thermodynamic analysis model to study the nonlinear temperature distribution law of ballastless track. The accuracy of the analysis method was verified by the measured data. On this basis, the regional distribution law of temperature gradient of ballastless track under different geographical coordinates and climatic conditions was studied. By adding a regional adjustment coefficient, the vertical temperature load model of ballastless track suitable for typical areas in China was proposed. The proposed temperature load model makes up for the lack of refinement of climate division and temperature load model in relevant specifications, and has strong engineering application and popularization value.

Keywords: high-speed railway; ballastless track; temperature field; nonlinearity; thermodynamic analysis; numerical analysis; finite element (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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