Article (Scientific journals)
A multiaxial constitutive model for concrete in the fire situation: Theoretical formulation.
Gernay, Thomas; Millard, Alain; Franssen, Jean-Marc
2013In International Journal of Solids and Structures, 50 (22-23), p. 3659-3673
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Keywords :
thermomechanical processes; concrete; constitutive behavior; elastic-plastic material; damage model; fire
Abstract :
[en] This paper aims to develop a multiaxial concrete model for implementation in finite element softwares dedicated to the analysis of structures in fire. The need for proper concrete model remains a challenging task in structural fire engineering because of the complexity of the concrete mechanical behavior characterization and the severe requirements for the material models raised by the development of performance-based design. A fully threedimensional model is developed based on the combination of elastoplasticity and damage theories. The state of damage in concrete, assumed isotropic, is modeled by means of a fourth order damage tensor to capture the unilateral effect. The concrete model comprises a limited number of parameters that can be identified by three simple tests at ambient temperature. At high temperatures, a generic transient creep model is included to take into account explicitly the effect of transient creep strain. The numerical implementation of the concrete model in a finite element software is presented and a series of numerical simulations are conducted for validation. The concrete behavior is accurately captured in a large range of temperature and stress states. A limitation appears when modeling the concrete post-peak behavior in highly confined stress states, due to the coupling assumption between damage and plasticity, but the considered levels of triaxial confinement are unusual stress states in structural concrete.
Disciplines :
Civil engineering
Author, co-author :
Gernay, Thomas ;  Université de Liège - ULiège > Département Argenco : Secteur SE > Ingénierie du feu
Millard, Alain;  CEA, DEN, DANS, DM2S, SEMT, LM2S, F-91191
Franssen, Jean-Marc  ;  Université de Liège - ULiège > Département ArGEnCo > Ingénierie du feu
Language :
English
Title :
A multiaxial constitutive model for concrete in the fire situation: Theoretical formulation.
Alternative titles :
[fr] Un modèle constitutif pour le béton en situation d'incendie: Formulation théorique
Publication date :
October 2013
Journal title :
International Journal of Solids and Structures
ISSN :
0020-7683
eISSN :
1879-2146
Publisher :
Pergamon Press (part of Elsevier Science), Oxford, United Kingdom
Volume :
50
Issue :
22-23
Pages :
3659-3673
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 22 July 2013

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