Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track
In areas with large temperature differences, the uneven distribution of temperatures in the CRTS III ballastless track slab due to daytime sunlight can cause warpage deformation, leading to periodic rail irregularities that increase the wheel-rail impact of high-speed vehicles and accelerate track s...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2024-09-01
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| Series: | High-Speed Railway |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949867824000540 |
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| _version_ | 1846170006187933696 |
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| author | Lei Zhao Guotang Zhao Guotao Yang Hao Jin Chenxi Li |
| author_facet | Lei Zhao Guotang Zhao Guotao Yang Hao Jin Chenxi Li |
| author_sort | Lei Zhao |
| collection | DOAJ |
| description | In areas with large temperature differences, the uneven distribution of temperatures in the CRTS III ballastless track slab due to daytime sunlight can cause warpage deformation, leading to periodic rail irregularities that increase the wheel-rail impact of high-speed vehicles and accelerate track structure damage. Therefore, it is necessary to study the dynamic contact relationship between the composite slab and the base plate during vehicle running. The results of the study show that: 1) Under the influence of temperature gradients, the composite slab tends to deform elliptically. With a positive temperature gradient, the middle part of the track slab bulges upward, causing the slab to be supported by its four corners. Conversely, with a negative temperature gradient, the four corners of the track slab bulge upward, resulting in the slab being supported by its center. 2) Temperature gradients can lead to separation between the composite slab and the base plate, reducing the contact area between layers. During vehicle running, the contact area between layers gradually increases, but the separation cannot be completely closed. 3) The temperature gradient significantly affects the vertical displacement of the track. The vertical displacement in the middle of the slab increases with a positive temperature gradient. In contrast, the vertical displacement at the ends of the slab increases with a negative temperature gradient. 4) The stress of self-compacting concrete at the side position significantly increases under a positive temperature gradient, with the vertical stress increasing by 2.7 times when the temperature gradient increases from 0 to 90 ℃·m−1. |
| format | Article |
| id | doaj-art-4872f0f271834e3e86bd7595f4f3d2ad |
| institution | Kabale University |
| issn | 2949-8678 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | High-Speed Railway |
| spelling | doaj-art-4872f0f271834e3e86bd7595f4f3d2ad2024-11-12T05:22:20ZengKeAi Communications Co., Ltd.High-Speed Railway2949-86782024-09-0123133142Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless trackLei Zhao0Guotang Zhao1Guotao Yang2Hao Jin3Chenxi Li4Railway Engineering Research Institute, China Academy of Railway Sciences Co., Ltd, Beijing 100081, China; Corresponding author.China State Railway Group Co., Ltd., Beijing 100844, ChinaChina State Railway Group Co., Ltd., Beijing 100844, ChinaSchool of Transportation, Southeast University, Nanjing 211189, ChinaSchool of Traffic and Transportation, Beijing Jiaotong University, Beijing 100081, ChinaIn areas with large temperature differences, the uneven distribution of temperatures in the CRTS III ballastless track slab due to daytime sunlight can cause warpage deformation, leading to periodic rail irregularities that increase the wheel-rail impact of high-speed vehicles and accelerate track structure damage. Therefore, it is necessary to study the dynamic contact relationship between the composite slab and the base plate during vehicle running. The results of the study show that: 1) Under the influence of temperature gradients, the composite slab tends to deform elliptically. With a positive temperature gradient, the middle part of the track slab bulges upward, causing the slab to be supported by its four corners. Conversely, with a negative temperature gradient, the four corners of the track slab bulge upward, resulting in the slab being supported by its center. 2) Temperature gradients can lead to separation between the composite slab and the base plate, reducing the contact area between layers. During vehicle running, the contact area between layers gradually increases, but the separation cannot be completely closed. 3) The temperature gradient significantly affects the vertical displacement of the track. The vertical displacement in the middle of the slab increases with a positive temperature gradient. In contrast, the vertical displacement at the ends of the slab increases with a negative temperature gradient. 4) The stress of self-compacting concrete at the side position significantly increases under a positive temperature gradient, with the vertical stress increasing by 2.7 times when the temperature gradient increases from 0 to 90 ℃·m−1.http://www.sciencedirect.com/science/article/pii/S2949867824000540High-speed railwayBallastless trackTemperature gradientPeriodic irregularitiesInterlayer contact |
| spellingShingle | Lei Zhao Guotang Zhao Guotao Yang Hao Jin Chenxi Li Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track High-Speed Railway High-speed railway Ballastless track Temperature gradient Periodic irregularities Interlayer contact |
| title | Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track |
| title_full | Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track |
| title_fullStr | Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track |
| title_full_unstemmed | Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track |
| title_short | Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track |
| title_sort | study on the dynamic contact relationship between layers under temperature gradients in crtsiii ballastless track |
| topic | High-speed railway Ballastless track Temperature gradient Periodic irregularities Interlayer contact |
| url | http://www.sciencedirect.com/science/article/pii/S2949867824000540 |
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