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Numerical Simulation of Spalling and Moisture Evaporation in Concrete Tunnel Linings Exposed to Fire
The modern feat of concrete tunnel construction can be owed to the longest rail tunnel, Gotthard Bass Tunnel and to the longest road tunnel, Laerdal Tunnel. Nevertheless, most concrete tunnels are subject to the rigorous understanding and assessment for the behavior of concrete tunnel lining in the event of an accidental explosion. Due to the rapid heating rate of tunnel fires, capillary and chemically bound water of concrete tunnel lining starts to evaporate and therefore increased pore pressure of water vapor leads to spalling of concrete tunnel linings. Conventional FE (finite element) simulation of heat transfer of concrete tunnel linings does not consider this spalling phenomena. As a result, prediction of temperatures inside tunnel lining by traditional heat transfer methods are remarkably underestimated. Therefore, for this study a numerical simulation was performed by eliminating the elements exceeding a critical temperature to incorporate the spalling of concrete during fire. Abaqus CAE was used as the finite element tool for this study. Existing experimental test results of similar fire exposure (Richtlinien für die Ausstattung und den Betrieb von Straßentunneln/RABT) were used to validate the Abaqus FE simulations. After comparing results of traditional analysis method and Abaqus EDM (element deletion method) with experimental data, the authors concluded this study with the finding that contrary to conventional analysis, Abaqus EDM results showed very good correlation with experimental results.
Numerical Simulation of Spalling and Moisture Evaporation in Concrete Tunnel Linings Exposed to Fire
The modern feat of concrete tunnel construction can be owed to the longest rail tunnel, Gotthard Bass Tunnel and to the longest road tunnel, Laerdal Tunnel. Nevertheless, most concrete tunnels are subject to the rigorous understanding and assessment for the behavior of concrete tunnel lining in the event of an accidental explosion. Due to the rapid heating rate of tunnel fires, capillary and chemically bound water of concrete tunnel lining starts to evaporate and therefore increased pore pressure of water vapor leads to spalling of concrete tunnel linings. Conventional FE (finite element) simulation of heat transfer of concrete tunnel linings does not consider this spalling phenomena. As a result, prediction of temperatures inside tunnel lining by traditional heat transfer methods are remarkably underestimated. Therefore, for this study a numerical simulation was performed by eliminating the elements exceeding a critical temperature to incorporate the spalling of concrete during fire. Abaqus CAE was used as the finite element tool for this study. Existing experimental test results of similar fire exposure (Richtlinien für die Ausstattung und den Betrieb von Straßentunneln/RABT) were used to validate the Abaqus FE simulations. After comparing results of traditional analysis method and Abaqus EDM (element deletion method) with experimental data, the authors concluded this study with the finding that contrary to conventional analysis, Abaqus EDM results showed very good correlation with experimental results.
Numerical Simulation of Spalling and Moisture Evaporation in Concrete Tunnel Linings Exposed to Fire
Lecture Notes in Civil Engineering
Belayutham, Sheila (Herausgeber:in) / Che Ibrahim, Che Khairil Izam (Herausgeber:in) / Alisibramulisi, Anizahyati (Herausgeber:in) / Mansor, Hazrina (Herausgeber:in) / Billah, Muntasir (Herausgeber:in) / Saleheen, Zobaer (Autor:in) / Krishnamoorthy, Renga Rao (Autor:in)
International Conference on Sustainable Civil Engineering Structures and Construction Materials ; 2020
07.04.2022
14 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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