Anisotropic damage model on the effects of damage process due to shearing stress in concrete - doi: 10.4025/actascitechnol.v35i2.13332

Abstract

This study deals with the proposal of damage variables related to structural behavior of the concrete subjected to shear stress. It is also addressed the laws of evolution and their incorporation into the formulation of a constitutive model for the concrete. Originally, this model considers the anisotropy and bimodularity induced by damage. Initially, the formulation of the damage model is briefly described. The material is assumed to behave as an elastic isotropic medium that start to present anisotropy and bimodular response (distinct elastic responses for prevailing states of tension or compression). Afterwards, we discussed some proposals of damage variables related to the structural behavior of the concrete when subjected to shear stress and their respective laws of evolution. The chosen proposal is then incorporated to the original model and implemented in a finite element code to perform plane analysis. Finally, the numerical responses of the model are compared with the experimental of reinforced concrete beams with different reinforcement rates. The results are presented and discussed aiming to verify the improvements presented by the new version of the model and to show the contribution of the energy dissipation due to shear in the cracked concrete behavior for the analyzed examples.