A holistic numerical approach to simulating the thermal and mechanical behaviour of a tunnel lining subject to fire

Soon Wook Choi, Jun Hwan Lee, Soo Ho Chang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Conventional heat transfer analysis for the prediction of fire-induced damage in a tunnel is performed without consideration of the spalling and dehydration of concrete, meaning that the fire-induced damage of concrete may be underestimated. This study proposes a new model that is able to simulate structural loss during a fire by eliminating the elements exceeding a pre-determined critical temperature in a finite element analysis. The important parameters for the application of the proposed element elimination model include the critical temperature chosen as the element elimination criterion and the changes of the combined heat transfer coefficients, which are dependent on element size and the time-temperature history during a fire, respectively. These parameters are derived from a series of parametric studies based on real fire experiments using a high-temperature furnace. In order to verify the applicability of thermo-mechanical coupling analysis using the proposed model, the fire-induced damage of an unreinforced concrete tunnel lining was estimated with a focus on the spalling depth, temperature distribution, and equivalent stress in the remaining part of the concrete lining under RABT and RWS fire scenarios.

Original languageEnglish
Pages (from-to)122-134
Number of pages13
JournalTunnelling and Underground Space Technology
Volume35
DOIs
Publication statusPublished - 2013 Apr 1

Fingerprint

Tunnel linings
tunnel lining
Fires
Concretes
spalling
Spalling
damage
heat transfer
temperature
Temperature
Hot Temperature
Dehydration
Linings
dehydration
Heat transfer coefficients
Tunnels
Furnaces
Temperature distribution
tunnel
Heat transfer

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

Cite this

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A holistic numerical approach to simulating the thermal and mechanical behaviour of a tunnel lining subject to fire. / Choi, Soon Wook; Lee, Jun Hwan; Chang, Soo Ho.

In: Tunnelling and Underground Space Technology, Vol. 35, 01.04.2013, p. 122-134.

Research output: Contribution to journalArticle

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AB - Conventional heat transfer analysis for the prediction of fire-induced damage in a tunnel is performed without consideration of the spalling and dehydration of concrete, meaning that the fire-induced damage of concrete may be underestimated. This study proposes a new model that is able to simulate structural loss during a fire by eliminating the elements exceeding a pre-determined critical temperature in a finite element analysis. The important parameters for the application of the proposed element elimination model include the critical temperature chosen as the element elimination criterion and the changes of the combined heat transfer coefficients, which are dependent on element size and the time-temperature history during a fire, respectively. These parameters are derived from a series of parametric studies based on real fire experiments using a high-temperature furnace. In order to verify the applicability of thermo-mechanical coupling analysis using the proposed model, the fire-induced damage of an unreinforced concrete tunnel lining was estimated with a focus on the spalling depth, temperature distribution, and equivalent stress in the remaining part of the concrete lining under RABT and RWS fire scenarios.

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