Experimental Study of the Concrete Cracking Behavior of an Immersed Tunnel under Fire
This study investigates the impact of fire on the cracking behavior of immersed tunnels. A reduced-scale (1:5) model of an immersed tunnel was constructed to conduct fire tests in both traffic tubes using the HCinc curve as the applied fire. Temperature field changes were carefully monitored during...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/13/6/1412 |
| _version_ | 1797595680914538496 |
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| author | Jintao Duan Peiyun Qiu Jianyong Liu Xin Wu |
| author_facet | Jintao Duan Peiyun Qiu Jianyong Liu Xin Wu |
| author_sort | Jintao Duan |
| collection | DOAJ |
| description | This study investigates the impact of fire on the cracking behavior of immersed tunnels. A reduced-scale (1:5) model of an immersed tunnel was constructed to conduct fire tests in both traffic tubes using the HCinc curve as the applied fire. Temperature field changes were carefully monitored during the test by thermocouples and infrared thermography on the outer surface of the tunnel’s ceiling. The continuous temperature field and temperature changes in the concrete cracks were recorded by infrared thermography. By integrating the temperature field distribution in concrete and the behavior of concrete cracking, an analysis of the depth of concrete cracking in the immersed tunnel under fire was conducted. The concrete cracks exceeded 150 mm at 95 min of the fire test. The results indicate that the inner concrete exposed to fire undergoes thermal expansion, leading to tensile cracking of the outer concrete. Additionally, the fire-exposed surface of the tunnel is vulnerable to cracking due to a temperature decrease. Thus, the design of fire resistance of immersed tunnels should take into consideration the potential for concrete cracking caused by thermal strain. |
| first_indexed | 2024-03-11T02:40:46Z |
| format | Article |
| id | doaj.art-6d6a023b0a9e4099b20f79ad47807b11 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-11T02:40:46Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-6d6a023b0a9e4099b20f79ad47807b112023-11-18T09:37:56ZengMDPI AGBuildings2075-53092023-05-01136141210.3390/buildings13061412Experimental Study of the Concrete Cracking Behavior of an Immersed Tunnel under FireJintao Duan0Peiyun Qiu1Jianyong Liu2Xin Wu3State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, ChinaGuangzhou Metro Group Co., Ltd., Guangzhou 510000, ChinaGuangdong Province Enterprise Key Laboratory of Materials and Elements Fire Testing Technology, Guangzhou Building Material Institute Limited Company, Guangzhou 510663, ChinaGuangdong Province Enterprise Key Laboratory of Materials and Elements Fire Testing Technology, Guangzhou Building Material Institute Limited Company, Guangzhou 510663, ChinaThis study investigates the impact of fire on the cracking behavior of immersed tunnels. A reduced-scale (1:5) model of an immersed tunnel was constructed to conduct fire tests in both traffic tubes using the HCinc curve as the applied fire. Temperature field changes were carefully monitored during the test by thermocouples and infrared thermography on the outer surface of the tunnel’s ceiling. The continuous temperature field and temperature changes in the concrete cracks were recorded by infrared thermography. By integrating the temperature field distribution in concrete and the behavior of concrete cracking, an analysis of the depth of concrete cracking in the immersed tunnel under fire was conducted. The concrete cracks exceeded 150 mm at 95 min of the fire test. The results indicate that the inner concrete exposed to fire undergoes thermal expansion, leading to tensile cracking of the outer concrete. Additionally, the fire-exposed surface of the tunnel is vulnerable to cracking due to a temperature decrease. Thus, the design of fire resistance of immersed tunnels should take into consideration the potential for concrete cracking caused by thermal strain.https://www.mdpi.com/2075-5309/13/6/1412immersed tunnelfire testinfrared thermographyconcrete crackingtunnel fire |
| spellingShingle | Jintao Duan Peiyun Qiu Jianyong Liu Xin Wu Experimental Study of the Concrete Cracking Behavior of an Immersed Tunnel under Fire Buildings immersed tunnel fire test infrared thermography concrete cracking tunnel fire |
| title | Experimental Study of the Concrete Cracking Behavior of an Immersed Tunnel under Fire |
| title_full | Experimental Study of the Concrete Cracking Behavior of an Immersed Tunnel under Fire |
| title_fullStr | Experimental Study of the Concrete Cracking Behavior of an Immersed Tunnel under Fire |
| title_full_unstemmed | Experimental Study of the Concrete Cracking Behavior of an Immersed Tunnel under Fire |
| title_short | Experimental Study of the Concrete Cracking Behavior of an Immersed Tunnel under Fire |
| title_sort | experimental study of the concrete cracking behavior of an immersed tunnel under fire |
| topic | immersed tunnel fire test infrared thermography concrete cracking tunnel fire |
| url | https://www.mdpi.com/2075-5309/13/6/1412 |
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