Hydromechanical modeling of concrete under high confinement: modelling, validation, simulations
Résumé
A new constitutive model is proposed for the description of the coupled elasto-plastic-damage behaviour of concrete under a wide range of confining pressure. Based on experimental investigation, two plastic flow mechanisms are identified: plastic shear mechanism at low confining pressure and plastic pore collapse mechanism at high confining pressure. Furthermore, the increase of water saturation in concrete structure induces the diminution of capillary pressure in liquid contact which leads to an additional plastic deformation. Consequently, influence of water saturation state on the mechanical behaviour is also studied in this paper. This model is validated by comparisons with triaxial compressive tests conducted on concrete specimen with GIGA press at the laboratory 3S-R (Université Joseph Fourier-Grenoble). Then, simulations of dynamic penetration tests with rigid projectile on concrete slabs were carried out so as to validate numerical approach.
Origine : Fichiers produits par l'(les) auteur(s)
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