Nonlinear analysis of R/C panels by a two parameter concrete damage model

The paper presents an efficient numerical model for the inelastic response analysis of R/C panels under cyclic excitations. A plane stress 2d membrane model has been developed that accounts for the concrete and reinforcing steel interaction. The reinforcing bars are modeled as multiple smeared steel layers with an uniaxial stress-strain relation in the bar direction following the Menegotto-Pinto constitutive model with isotropic hardening. The concrete material model is based on damage mechanics with an efficient two parameter damage law. At this stage of the research the bond-slip between concrete and rebars is not taken into account. The new model is validated by comparison with several experimental results on reinforced concrete panels from the literature. The tests are carried out under quasi-static conditions. The accuracy of the model in reproducing the cyclic behavior of reinforced concrete panels with different reinforcement ratio and bar inclination is excellent.