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Modelling of elastoplastic damage in concrete due to desiccation shrinkage

type de publication      article in an international journal with refereeing comitee
date de publication 2002
auteur(s) Bourgeois Frédéric; Burlion Nicolas; Shao Jian-Fu
journal (abréviation) International Journal for Numerical and Analytical Methods in Geomechanics (int. J. Numer. Anal. Meth. Geomech.)
volume (numéro) 26 (8)
pages 759 – 774
résumé We present a numerical modelling of elastoplastic damage due to drying shrinkage of concrete in the framework of mechanics of partially saturated porous media. An elastoplastic model coupled with isotropic damage is first formulated. Two plastic flow mechanisms are involved, controlled by applied stress and suction, respectively. A general concept of net effective stress is used in take into account effects of capillary pressure and material damage on stress-controlled plastic deformation. Damage evolution depends both on elastic and plastic strains. The model's parameters are determined or chosen from relevant experimental data. Comparisons between numerical simulations and experimental data are presented to show the capacity of model to reproduce mains features of concrete behaviour under mechanical loading and during drying shrinkage of concrete. An example of application concerning drying of a concrete wall is finally presented. The results obtained allow to show potential capacity of proposed model for numerical modelling of complex coupling processes in concrete structures.
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