Numerical modelling of the Effect of Fire on Fiber-Reinforced Concrete in Tunnel Lining Using the Finite Element Method

Document Type : Research Article

Authors

Dept. of Mining Engineering, Faculty of Engineering and Technology, Imam Khomeini International University, Qazvin, Iran

Abstract

During a fire, in a short period of time, the temperature in the tunnel reaches about 1300 ̊c, which itself leads to many chemical interactions in the structural and non-structural components of the tunnels and changes their performance depending on the depth and the quality of these interactions, the structure can be seriously damaged and in the worst case, the stability of the tunnel can be compromised. In this research, an attempt was made to investigate the behavior of the tunnel concrete lining under fire conditions with the help of finite element numerical analysis. The ordinary concrete lining of the tunnel was affected by the fire, and the temperature of the tunnel reached about 𝟷𝟹𝟶𝟶 ̊c, and the behavior of its concrete lining was investigated. Then, according to the recommendations of the regulations to use fiber concrete to reduce the effects of fire, fiber concrete of steel fiber concrete, glass fiber concrete, and polypropylene fiber concrete were modeled under fire conditions. Considering the effect of fire on the tensile strength of concrete as well as its deformation, the focus of the current research was on the effect of fire on the tensile damage and deformation of concrete. The behavior of concrete lining is the same as behavior in normal conditions. The results of this research showed that steel fiber concrete showed the best performance against fire. The deformation of steel fiber concrete was reduced by 75% compared to concrete without fibers. The deformation of polypropylene fiber concrete was reduced by 15% compared to concrete without fibers. Deformation of glass fiber concrete showed a 10% decrease compared to concrete without fibers.

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References

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History

  • Receive Date: 09 June 2023
  • Revise Date: 15 July 2024
  • Accept Date: 21 July 2024

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