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

1
School of Civil Engineering, Central South University, Changsha 410075, China
2
National Engineering Research Center of High-Speed Railway Construction Technology, Changsha 410075, China
3
China Railway Design Corporation, Tianjin 300308, China
*
Author to whom correspondence should be addressed.
Academic Editor: Armin Fügenschuh
Mathematics 2022, 10(1), 120; https://doi.org/10.3390/math10010120
Received: 3 December 2021 / Revised: 23 December 2021 / Accepted: 30 December 2021 / Published: 1 January 2022
(This article belongs to the Section Engineering Mathematics)
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. View Full-Text
Keywords: high-speed railway; ballastless track; temperature field; nonlinearity; thermodynamic analysis; numerical analysis; finite element high-speed railway; ballastless track; temperature field; nonlinearity; thermodynamic analysis; numerical analysis; finite element
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MDPI and ACS Style

Yan, B.; Cheng, R.; Xie, H.; Zhang, X. Vertical Nonlinear Temperature Gradient and Temperature Load Mode of Ballastless Track in China. Mathematics 2022, 10, 120. https://doi.org/10.3390/math10010120

AMA Style

Yan B, Cheng R, Xie H, Zhang X. Vertical Nonlinear Temperature Gradient and Temperature Load Mode of Ballastless Track in China. Mathematics. 2022; 10(1):120. https://doi.org/10.3390/math10010120

Chicago/Turabian Style

Yan, Bin, Ruiqi Cheng, Haoran Xie, and Xiangmin Zhang. 2022. "Vertical Nonlinear Temperature Gradient and Temperature Load Mode of Ballastless Track in China" Mathematics 10, no. 1: 120. https://doi.org/10.3390/math10010120

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