[en] This work presents an analysis of the behaviour of different structural members under natural fires, with the aim to characterize their sensitivity to the fire decay phase. Thermo-mechanical numerical simulations based on the non-linear finite element method are conducted using the parametric fire model of Eurocode to represent the natural fires. Results show that, for all the studied members (column, beam) and materials (reinforced concrete, steel, timber), structural failure during or after the cooling phase of a fire is a possible event. The major factors that promote delayed structural failure are the thermal inertia and the constituting material of the member. An indicator is proposed to quantify the propensity to delayed failure for structural members under natural fire. This work enhances the understanding of the structural behaviour under natural fires and has implications for the safety of the fire brigades and people proceeding to a building inspection after a fire.
Disciplines :
Civil engineering
Author, co-author :
Gernay, Thomas ; Université de Liège - ULiège > Département ArGEnCo > Ingénierie du feu
Language :
English
Title :
Sensitivity of structures to fire decay phases: quantitative comparison of structural components made of different materials
Publication date :
2017
Event name :
Applications of Structural Fire Engineering
Event organizer :
University of Zagreb
Event place :
Dubrovnik, Croatia
Event date :
15-16 October 2015
Audience :
International
Main work title :
Proceedings of the Int. Conf. ASFE in Dubrovnik, 15-16 October 2015
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Bibliography
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EC5. 2004. EN 1995-1-2. Eurocode 5 - Design of timber structures - Part 1-2: General - Structural fire design. Brussels: CEN.
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Franssen JM 2005. SAFIR: A thermal/structural program for modeling structures under fire. Engineering Journal - American Institute of Steel Construction, 42(3), p. 143-158.
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Gernay T, Franssen JM. 2012. A formulation of the Eurocode 2 concrete model at elevated temperature that includes an explicit term for transient creep, Fire Safety Journal, 51, p. 1-9.
Gernay T, Dimia MS. 2013. Structural behaviour of concrete columns under natural fires. Engineering Computations, 30(6), p. 854-872.
Gernay T, Franssen JM. 2015. A performance indicator for structures under natural fire, Engineering Structures, 100, p. 94-103.
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