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| The influence of intumescent fire retardant coating on the fire resistance of assembled frame tunnel |
| HUANG Zhen1,2，YE Zhangqian1，ZHANG Jiawei1，PENG Zimao3，YAN Zhanshuo1
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| (1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 2. State Key Laboratory of Life-cycle Safety of Characteristic Metal Materials and Composite Structures, Guangxi University, Nanning 530004, Guangxi, China; 3. Architectural Engineering Institute, Hunan Communication Polytechnic, Changsha 410132, Hunan, China) |
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Abstract To evaluate the influence of fire retardant coating on the fire resistance of assembled frame tunnel, the temperature field distribution law of tunnel joint components coated with intumescent fire retardant coating was analyzed by fire test, and the influence of fire retardant coating on the temperature, deformation and damage of assembled frame tunnel under fire was studied by finite element numerical simulation. The results showed that: The fire retardant coating hindered the heat transfer to the tunnel lining, greatly reduced the temperature peak of the tunnel lining, and delayed the time of the temperature peak. The thickness of fire retardant coating will affect the heating rate and temperature peak of tunnel lining under fire, but when the thickness of the intumescent fire retardant coating was greater than 10 mm, changing the thickness of fire retardant coating couldn’t effectively reduce the deformation of tunnel under fire. The maximum deformation of the prefabricated frame tunnel under fire is the mid-span position of the roof, and the most serious damage was the position of the tunnel joint, which could indirectly improve the fire resistance of the prefabricated frame tunnel by optimizing the mechanical performance of the joint structure.
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Received: 22 September 2023
Published: 11 December 2023
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