Article (Scientific journals)
Effect of Transient Creep Strain Model on the Behavior of Concrete Columns Subjected to Heating and Cooling
Gernay, Thomas
2012In Fire Technology, 48 (2), p. 313-329
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Keywords :
Concrete; Constitutive Model; Fire; Transient Creep; Cooling; Heating; RC Column; Axially Restrained
Abstract :
[en] In the numerical analysis of structures in fire, the material models that are used have important implications on the global behavior of the structure. In concrete, a particular phenomenon appears when subjected to high temperatures: the transient creep strain. Models integrating explicitly a term for transient creep strain have been proposed in the literature but, in the current Eurocode 2 model, there is no explicit term for transient creep strain. This phenomenon is included in the Eurocode 2 model, but it is implicitly considered in the mechanical strain term. A series of experimental fire tests on axially restrained concrete columns subjected to heating and cooling has been recently performed at South China University of Technology and described by Wu et al. (Fire Technol 46:231–249). In the original paper, it was shown that using the implicit model of Eurocode 2, the behavior of the columns cannot be simulated properly, especially during the cooling phase. The objective of the present paper is to perform again the fire tests simulations using a new formulation of the Eurocode 2 model that contains an explicit term for transient creep. In the first part of the paper, the explicit formulation of the Eurocode 2 model is presented. In the second part, the fire tests are modeled with the software SAFIR using, on the one hand, the implicit Eurocode model and, on the other hand, the new explicit model. It is shown that the transient creep model has significant implications on the global behavior of structural concrete members, as the residual axial load sustained by the columns at the end of the fire can differ by up to 25% of the initial applied load depending on the transient creep strain model that is used for the calculation. The experimental behavior is better matched with the new explicit model than with the current Eurocode model. Particularly, the results given by the Eurocode model during the cooling phase are unconservative as the residual axial load is overestimated. Finally, it is explained why, on the basis of an example, in a performance-based approach, these results can have important implications on the global fire resistance of a structure.
Disciplines :
Civil engineering
Author, co-author :
Gernay, Thomas ;  Université de Liège - ULiège > Département Argenco : Secteur SE > Ingénierie du feu
Language :
English
Title :
Effect of Transient Creep Strain Model on the Behavior of Concrete Columns Subjected to Heating and Cooling
Publication date :
April 2012
Journal title :
Fire Technology
ISSN :
0015-2684
eISSN :
1572-8099
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
Volume :
48
Issue :
2
Pages :
313-329
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Commentary :
(C) 2011 Springer Science+Business Media, LLC. Manufactured in The United States. The final publication is available at www.springerlink.com.
Available on ORBi :
since 21 April 2011

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