References of "Millard, Alain"
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See detailA multiaxial constitutive model for concrete in the fire situation: Theoretical formulation.
Gernay, Thomas ULg; Millard, Alain; Franssen, Jean-Marc ULg

in International Journal of Solids and Structures (2013), 50(22-23), 3659-3673

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 ... [more ▼]

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. [less ▲]

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See detailA multiaxial concrete model for applications in structural fire engineering
Gernay, Thomas ULg; Millard, Alain

in Fontana, M.; Frangi, A.; Knobloch, M. (Eds.) Proceedings of the 7th International Conference on Structures in Fire (2012, June 07)

Temperature-dependent material models are required in numerical softwares dedicated to the nonlinear analysis of structures in fire. Although structural concrete is widely used in civil engineering ... [more ▼]

Temperature-dependent material models are required in numerical softwares dedicated to the nonlinear analysis of structures in fire. Although structural concrete is widely used in civil engineering, proper modelling of its thermo-mechanical behaviour remains a challenging issue for engineers mainly because of the complexity of the phenomena that result from the microcracking process in this composite material and because of the lack of numerical robustness of the models. This paper presents a new multiaxial concrete model developed for the analysis of concrete structures in fire. The multiaxial model is based on a plastic-damage formulation and incorporates an explicit term for transient creep strain. After implementation in a finite element software for structural fire engineering calculations, numerical simulations have been performed to highlight the ability of the model to capture some of the main phenomena that develop in concrete (permanent strains, degradation of the elastic properties, unilateral effect) as well as the ability to be used for the fire analysis of large-scale structural elements. [less ▲]

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See detailDéveloppement d'un modèle constitutif multiaxial de béton
Gernay, Thomas ULg; Millard, Alain; Franssen, Jean-Marc ULg

Scientific conference (2011, March 03)

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See detailRecommendation of RILEM TC 200-HTC: Mechanical concrete properties at high temperatures-modelling and applications : Part I. General presentation
Schneider, Ulrich; Felicetti, Roberto; Debicki, Gérard et al

in Materials and Structures (2007), 40(9), 841-853

The new set of RILEM recommendations specifies test methodologies for determining the different mechanical properties of concrete at high temperatures. The new set of recommendations applies to all types ... [more ▼]

The new set of RILEM recommendations specifies test methodologies for determining the different mechanical properties of concrete at high temperatures. The new set of recommendations applies to all types of concrete used in construction, including high strength concrete. The recommendations specify that the environmental and testing conditions associated with service or accident conditions of structural concrete at high temperature need to be considered, while using these building materials for construction activities. The recommendations are also applicable to concrete in the temperature range of 20°C-750°C. The recommendations also contain several results of the experimental investigations conducted, to examine the behavior of concrete at high temperature that depend on test conditions. [less ▲]

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See detailPart 10: Restraint stress
Schneider, Ulrich; Felicetti, Roberto; Debicki, Gérard et al

in Materials and Structures (2005), 38

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See detailModulus of elasticity for service and accident conditions
Schneider, Ulrich; Schwesinger, P.; Debicki, Gérard et al

in Materials and Structures (2004), 37

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See detailRILEM Recommendations: Part 4: Tensile strength for service and accident conditions
Schneider, Ulrich; Schwesinger, P.; Debicki, Gérard et al

in Materials and Structures (2000), 33

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See detailPart 8: Steady-state creep and creep recovery for service and accident conditions
Schneider, Ulrich; Schwesinger, P.; Debicki, Gérard et al

in Materials and Structures (2000), 33

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See detailPart 9: Shrinkage for service and accident conditions
Schneider, Ulrich; Schwesinger, P.; Debicki, Gérard et al

in Materials and Structures (2000), 33

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See detailRILEM Recommendations : Part 7: Transient Creep for service and accident conditions
Schneider, Ulrich; Schwesinger, P.; Debicki, Gérard et al

in Materials and Structures (1998), 31

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See detailRILEM Recommendations : Part 6 – Thermal Strain
Schneider, Ulrich; Schwesinger, P.; Debicki, Gérard et al

in Materials and Structures (1997)

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See detailCompressive strength for service and accident conditions
Schneider, Ulrich; Schwesinger, P.; Debicki, Gérard et al

in Materials and Structures (1995), 28(181), 410-414

Detailed reference viewed: 25 (1 ULg)