Experimental Study of the Temperature Distribution in CRTS-II Ballastless Tracks on a High-Speed Railway Bridge
Abstract
:1. Introduction
2. Experimental Program
2.1. Design and Construction of the Specimen
2.2. Temperature Test Device
2.3. Determination of the Maximum Temperature Value
3. Vertical Temperature Distribution
3.1. Temperature-Time Relationship
3.2. Vertical Temperature Gradient
3.3. Vertical Temperature Distribution
3.4. Vertical Temperature Difference Distribution
4. Transverse Temperature Distribution and Laws
4.1. Transverse Temperature Distribution
4.2. Transverse Temperature Difference and Temperature Gradient
5. Three-Dimensional Temperature Distribution
6. Discussions
7. Conclusions
- (1)
- According to the EHT test and the CHT test, there is an obvious difference in the temperature conduction in the different layers of the track, and the greater the depth from the top surface of the track slab, the more obvious the temperature conduction lag.
- (2)
- In summer, the internal temperature gradient in the different of the track layers is positive and changes periodically (every 24 h). The bottom base is the less affected by the vertical temperature gradient in the track. The CA mortar layer shows heat insulation and preservation effects in the different test conditions, and is the layer the most affected by the vertical temperature gradient in the track.
- (3)
- The vertical temperature distribution in the track has a nonlinear, three-stage trend and the heat conduction in the CA mortar layer is blocked; therefore, the temperature gradient effect in the track is very significant.
- (4)
- The transverse temperature distribution in the different layers of the CRTS-II ballastless track has a quadratic parabolic trend, and the CA mortar layer is the most significant factor affecting the transverse temperature distribution in the track.
- (5)
- The CA mortar layer exhibits a heat insulation effect to reduce the heat loss. At the same time, the concrete box girder also exhibits continuous temperature preservation performance in the bottom base when the air temperature decreases.
- (6)
- In the EHT test, when the air temperature increases rapidly, the three-dimensional temperature distribution in the track has a nonlinear three-stage surface trend, and when the air temperature decreases rapidly, the three-dimensional temperature distribution in the bottom part of the track has a saddle-shaped surface trend. The distribution in the upper part has a duck-tongue surface trend. Under the no direct sunshine high temperature conditions of the CHT test, the three-dimensional temperature distribution in the track has a double hump saddle surface trend.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Projects | L (mm) | S (mm2) | α (mm−1) | αs/αp |
---|---|---|---|---|
Scaled specimen | 900 | 88,200 | 0.0102 | 3.52 |
Prototype | 3420 | 1,180,800 | 0.0029 |
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Zhao, L.; Zhou, L.-Y.; Zhang, G.-C.; Wei, T.-Y.; Mahunon, A.D.; Jiang, L.-Q.; Zhang, Y.-Y. Experimental Study of the Temperature Distribution in CRTS-II Ballastless Tracks on a High-Speed Railway Bridge. Appl. Sci. 2020, 10, 1980. https://doi.org/10.3390/app10061980
Zhao L, Zhou L-Y, Zhang G-C, Wei T-Y, Mahunon AD, Jiang L-Q, Zhang Y-Y. Experimental Study of the Temperature Distribution in CRTS-II Ballastless Tracks on a High-Speed Railway Bridge. Applied Sciences. 2020; 10(6):1980. https://doi.org/10.3390/app10061980
Chicago/Turabian StyleZhao, Lei, Ling-Yu Zhou, Guang-Chao Zhang, Tian-Yu Wei, Akim D. Mahunon, Li-Qiang Jiang, and Ying-Ying Zhang. 2020. "Experimental Study of the Temperature Distribution in CRTS-II Ballastless Tracks on a High-Speed Railway Bridge" Applied Sciences 10, no. 6: 1980. https://doi.org/10.3390/app10061980
APA StyleZhao, L., Zhou, L.-Y., Zhang, G.-C., Wei, T.-Y., Mahunon, A. D., Jiang, L.-Q., & Zhang, Y.-Y. (2020). Experimental Study of the Temperature Distribution in CRTS-II Ballastless Tracks on a High-Speed Railway Bridge. Applied Sciences, 10(6), 1980. https://doi.org/10.3390/app10061980