Thermo-mechanical modeling of plasterboard- lined partition submitted to fire load

International audienceAn important problem is the development of a thermo-mechanical model of plasterboard lined partition submitted to fire load. A fundamental key to solve such a problem is the development and the experimental validation of a deterministic and a probabilistic thermo-mechanical model of cardboard-plaster-cardboard (CPC) submitted to fire load. The proposed model takes into account system parameter uncertainties and model uncertainties. The first part concerns the constitution of an experimental thermo-mechanical data base for a CPC multilayer and for its components.The second one is the development of an homogenization thermomechanical mean model for the CPC multilayer. This mean model is adapted to a temperature range in which plaster or cardboard may be damaged. The third part is devoted to the implementation of the probabilistic model. In the last part, we present the results of numerical simulations which are compared to the experimental data

Modèle probabiliste d'homogénéisation des plaques multicouches carton-plâtre-carton: expérimentations et simulations

National audienceThis paper deals with a non parametric probabilistic approach for modelling the multilayer cardboard-plaster-cardboard (CPC) thermomechanical behaviour. We present first, the experimental approach which allows the thermomechanical characterization of the CPC taking implicitly into account the hydrous phase. Secondly we present the developed CPC non-linear mean model of homogenization which simulation results are compared to the experimental ones. Finaly we present the probabilistic non linear model of the multilayer homogenization

Probabilistic uncertainty modeling for thermomechanical analysis of plasterboard submitted to fire load

International audienceThe paper deals with the probabilistic modeling of the thermomechanical behavior of cardboard-plaster-cardboard (CPC) multilayer plates submitted to fire load. The proposed model takes into account data and model uncertainties. This work is justified by the fact that fire resistance tests of plasterboard-lined partitions are made impossible when their dimensions exceed those of furnaces. A fundamental key to solve such a problem is the development and experimental validation of a deterministic and probabilistic model of CPC multilayers submitted to fire load. The first step of this work concerns the constitution of an experimental thermomechanical data base for a CPC multilayer and for its components. These experimental tests are carried out by the use of a bench test specially designed for this work. The second step is the development of a homogenization thermomechanical mean model for the CPC multilayer. The third step is the development of a probabilistic model of uncertainties based on the nonparametric probabilistic approach. Numerical results are compared with the experimental ones

Modèle thermomécanique à haute température et à rupture pour les plaques multicouches carton-plâtre-carton soumises au feu. Expériences et simulations numériques

National audienceGenerally, the standard rules require conventional tests at scale one in order to justify the fire resistance of loaded plasterboard lined partitions. Such tests cannot be performed when panel dimensions exceed five meters. This paper corresponds to a research whose objectives are to develop a numerical simulation model validated with experiments in order to model large panel behavior. In this research a first step, is to develop a complete thermomechanical model for multilayer composite panel constituted of cardboard-plaster-cardboard (CPC). The developed model is adapted to a range of temperature for which the cardboard and the plaster can be destroyed. This model is also developed for a level of stress corresponding to the rupture of the cardboard and the plaster. The mathematical-mechanical model and numerical simulations are performed with a dedicated finite element code and the numerical results are compared to thermo-mechanical experiments especially developed in the context of this research. A description of the experiments is given

Thermo-mechanical model of a cardboard-plaster-cardboard composite plate submitted to fire load and experiments

International audienceGenerally, the standard rules require conventional tests at scale one in order to justify the fire resistance of loaded plasterboard-lined partitions. This paper corresponds to a project whose objectives are to develop a numerical simulation model validated with experiments in order to predict thermo-mechanical overall partition behaviour. This research is organized in four steps. The first step is to set on an experimental then-no-mechanical data base for multilayer cardboard-plaster-cardboard(CPC). These tests are carried out using a new testing bench specially developed for this research. A full description of this device is given in the paper. In order to prepare the implementation of a probabilistic model for the CPC multilayer, several tests are performed for different thermo-mechanical configurations. The second step of the research is the development of a complete thermo-mechanical model for CPC multi-layer plates. The developed model is adapted to a range of temperatures for which the cardboard and the plaster can be destroyed. The mathematical-mechanical model has been developed in order to simulate the thermo-mechanical behaviour of the CPC panels subjected to a heat flow corresponding to the ISO 834 function. Numerical simulations performed with a dedicated finite element code are presented. The third step is the identification of the thermo-mechanical parameters for each material of the CPC plasterboard. Thermo-mechanical bending tests for plaster and thermo-mechanical tensile tests for each cardboard are performed. Results show an important dispersal of the Young modulus which will justify the implementation of a probabilistic model which is still in progress. The fourth step consists in comparing numerical results to the thermo-mechanical experiments of step one and to validate. the developed model

Computational stochastic heat transfer with model uncertainties in a plasterboard submitted to fire load and experimental validation

International audienceThe paper deals with probabilistic modeling of heat transfer throughout plasterboard plates when exposed to an equivalent ISO thermal load. The proposed model takes into account data and model uncertainties. This research addresses a general need to perform robust modeling of plasterboard-lined partition submitted to fire load. The first step of this work concerns the development of an experimental thermo, physical identification data base for plasterboard. These experimental tests are carried out by the use of a bench test specially designed within the framework of this research. A computational heat transfer model is constructed using data from the literature and also the identified plasterboard thermophysical properties. The developed mean model constitutes the basis of the computational stochastic heat transfer model that has been constructed employing the nonparametric probabilistic approach. Numerical results are compared to the experimental ones