Temperature Load Mode of Bridge in Permafrost Region of Qinghai–Tibet Railway
The Qinghai–Tibet railway is the plateau permafrost railway with the highest altitude and the longest line in the world. The natural conditions along the line are harsh, with many unfavorable factors such as low temperature, strong ultraviolet radiation, and large changes in daily temperature, resul...
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ftdoajarticles:oai:doaj.org/article:392d234c18bd42e486d20c5c3229388d 2023-05-15T17:57:18+02:00 Temperature Load Mode of Bridge in Permafrost Region of Qinghai–Tibet Railway Bin Yan Ruiqi Cheng Haoran Xie Xiangmin Zhang 2022-04-01T00:00:00Z https://doi.org/10.3390/app12094377 https://doaj.org/article/392d234c18bd42e486d20c5c3229388d EN eng MDPI AG https://www.mdpi.com/2076-3417/12/9/4377 https://doaj.org/toc/2076-3417 doi:10.3390/app12094377 2076-3417 https://doaj.org/article/392d234c18bd42e486d20c5c3229388d Applied Sciences, Vol 12, Iss 4377, p 4377 (2022) Qinghai–Tibet railway concrete bridge temperature field finite element heat transfer experimental study Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 article 2022 ftdoajarticles https://doi.org/10.3390/app12094377 2022-12-31T02:49:37Z The Qinghai–Tibet railway is the plateau permafrost railway with the highest altitude and the longest line in the world. The natural conditions along the line are harsh, with many unfavorable factors such as low temperature, strong ultraviolet radiation, and large changes in daily temperature, resulting in frequent bridge damage. In order to study the bridge temperature field and its effect in the permafrost region of the Qinghai–Tibet railway, a long-term field test was carried out, and a calculation model of sunshine temperature field of concrete two-piece T-beam was established based on the principle of meteorology and heat transfer. On this basis, the beam temperature difference load mode, beam section temperature distribution law, and temperature effect were obtained. As revealed, the daily temperature difference of the Qinghai–Tibet railway bridge is large in winter, which is related to the ground’s effective radiation and surface reflectivity, and the maximum value has exceeded the current codes. The beam section temperature field shows “internal heat and external cold” in the morning and “internal cold and external heat” from noon to evening. Under the action of strong radiation and large temperature difference, bridge displacement occurs frequently, by which it is easy to cause damage to rail fasteners and bridge bearings. Based on the field test and finite element analysis, the bridge temperature difference load mode was proposed, which makes up for the deficiency that the relevant codes do not consider the plateau’s special climatic conditions and can provide a reference for the construction of plateau railways such as the Sichuan–Tibet railway. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Applied Sciences 12 9 4377 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Qinghai–Tibet railway concrete bridge temperature field finite element heat transfer experimental study Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Qinghai–Tibet railway concrete bridge temperature field finite element heat transfer experimental study Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Bin Yan Ruiqi Cheng Haoran Xie Xiangmin Zhang Temperature Load Mode of Bridge in Permafrost Region of Qinghai–Tibet Railway |
topic_facet |
Qinghai–Tibet railway concrete bridge temperature field finite element heat transfer experimental study Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 |
description |
The Qinghai–Tibet railway is the plateau permafrost railway with the highest altitude and the longest line in the world. The natural conditions along the line are harsh, with many unfavorable factors such as low temperature, strong ultraviolet radiation, and large changes in daily temperature, resulting in frequent bridge damage. In order to study the bridge temperature field and its effect in the permafrost region of the Qinghai–Tibet railway, a long-term field test was carried out, and a calculation model of sunshine temperature field of concrete two-piece T-beam was established based on the principle of meteorology and heat transfer. On this basis, the beam temperature difference load mode, beam section temperature distribution law, and temperature effect were obtained. As revealed, the daily temperature difference of the Qinghai–Tibet railway bridge is large in winter, which is related to the ground’s effective radiation and surface reflectivity, and the maximum value has exceeded the current codes. The beam section temperature field shows “internal heat and external cold” in the morning and “internal cold and external heat” from noon to evening. Under the action of strong radiation and large temperature difference, bridge displacement occurs frequently, by which it is easy to cause damage to rail fasteners and bridge bearings. Based on the field test and finite element analysis, the bridge temperature difference load mode was proposed, which makes up for the deficiency that the relevant codes do not consider the plateau’s special climatic conditions and can provide a reference for the construction of plateau railways such as the Sichuan–Tibet railway. |
format |
Article in Journal/Newspaper |
author |
Bin Yan Ruiqi Cheng Haoran Xie Xiangmin Zhang |
author_facet |
Bin Yan Ruiqi Cheng Haoran Xie Xiangmin Zhang |
author_sort |
Bin Yan |
title |
Temperature Load Mode of Bridge in Permafrost Region of Qinghai–Tibet Railway |
title_short |
Temperature Load Mode of Bridge in Permafrost Region of Qinghai–Tibet Railway |
title_full |
Temperature Load Mode of Bridge in Permafrost Region of Qinghai–Tibet Railway |
title_fullStr |
Temperature Load Mode of Bridge in Permafrost Region of Qinghai–Tibet Railway |
title_full_unstemmed |
Temperature Load Mode of Bridge in Permafrost Region of Qinghai–Tibet Railway |
title_sort |
temperature load mode of bridge in permafrost region of qinghai–tibet railway |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/app12094377 https://doaj.org/article/392d234c18bd42e486d20c5c3229388d |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Applied Sciences, Vol 12, Iss 4377, p 4377 (2022) |
op_relation |
https://www.mdpi.com/2076-3417/12/9/4377 https://doaj.org/toc/2076-3417 doi:10.3390/app12094377 2076-3417 https://doaj.org/article/392d234c18bd42e486d20c5c3229388d |
op_doi |
https://doi.org/10.3390/app12094377 |
container_title |
Applied Sciences |
container_volume |
12 |
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9 |
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4377 |
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1766165700438654976 |