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Research Article | Open Access

Numerical study on smoke temperature characteristics in T-shaped bifurcated tunnel fires

Kebin SongaYongzheng Yaob,c( )Fei Renc( )Yuelin DaiaWei LiaHuan LiuaRushan FengaBaoping DongaLei Jiangd
CCCC Guangzhou Dredging Co., Ltd., Guangzhou 510000, China
School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, China Academy of Safety Science and Technology, Beijing 100012, China
RISE Fire Research, Trondheim 7092, Norway
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Abstract

Due to the swift progress of subterranean urban transportation, various branching structures emerged one after another. When it brought significant convenience to people’s travel, the fire hazard associated with it could not be overlooked. This paper analyzed the impact of the T-shaped bifurcated structure on the temperature characteristics of fire smoke through fire dynamics simulator (FDS) numerical simulation. The findings revealed that the temperature decrease trend of each section below the ceiling in a T-shaped bifurcated tunnel could be accurately described by a double exponential model. Notably, the attenuation coefficient of each section basically remained unchanged under natural ventilation. However, the coefficient varied distinctly and directly related to the dimensionless ventilation velocities (V') in each section under longitudinal ventilation. The maximum fire smoke temperature below the tunnel ceiling of the T-shaped bifurcated tunnel was higher than that below the single tunnel ceiling at lower ventilation velocities (V' ≤ 0.19), while lower than that below the single tunnel ceiling at higher ventilation velocities (V' > 0.19). On the basis of the numerical simulation data, a predictive model to estimate the maximum fire smoke temperature rise below the tunnel ceiling of a T-shaped bifurcated tunnel was proposed.

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Journal of Intelligent Construction
Article number: 9180021
Cite this article:
Song K, Yao Y, Ren F, et al. Numerical study on smoke temperature characteristics in T-shaped bifurcated tunnel fires. Journal of Intelligent Construction, 2024, 2(2): 9180021. https://doi.org/10.26599/JIC.2024.9180021
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Received: 18 November 2023
Revised: 19 January 2024
Accepted: 15 February 2024
Published: 23 May 2024
© The Author(s) 2024. Published by Tsinghua University Press.

The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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