CONICET | Buscador de Institutos y Recursos Humanos

A new constitutive formulation so-called ?Performance Dependent Model?valid for normal and high strength concretes is presented. The distinctiveaspect of this model is the consideration of relevant properties of concretemix components in the evaluation of the involved material performance orquality at the macroscopic stand point. In this way, the composite featuresof concrete are appropriately taken into account.The model maximum strength surface is defined by means of the ?PerformanceDependent Failure Criterion? proposed by the authors in previousworks. Concrete behaviors in pre and post peak regimes are modeled witha non uniform hardening law and an isotropic softening rule respectively,in terms of the acting confinement pressure, to realistically reproduce thecorresponding ductilities under different load scenarios. Concrete dilatancybehavior is approached by means of a volumetric non associative flow rule.The softening law is based on fracture energy concepts for mode I and IItypes of failure. The model considers two main input material parameters: the uniaxialcompressive strength and the performance parameter, a qualityindex defined in the context of the Performance Dependent Failure Criterion.The proposed constitutive relation is able to capture the very differentbehaviors of normal and high strength concretes and of concretes with thesame compressive strength but different concrete mixtures. After presentingthe most relevant equations of the proposed model, numerical analyses in thepaper illustrate model predictions of concrete failure behavior when differentmaterial qualities are involved.