This paper is concerned with the development of a damage model for concrete materials exhibiting a residual hysteretic behaviour at a fixed level of damage. This feature is obtained by coupling damage mechanics with sliding phenomena. In its complete form,…
This paper is concerned with the development of a damage model for concrete materials exhibiting a residual hysteretic behaviour at a fixed level of damage. This feature is obtained by coupling damage mechanics with sliding phenomena. In its complete form, the damage variable by which the stiffness decrease is allowed, is an orthotropic second order tensor. Its evolution is driven by the tensile part of the strain tensor. The sliding between the crack lips is assumed to have a plasticity kind of behaviour with non-linear kinematic hardening. The sliding stress depends on the level of damage. Such a model assumes the evolution of two yield surfaces : a fracture and a sliding one. If unilateral effects need to be taken into account for the analysis, the damage evolution remains isotropic. In this manner, cracks closure, needed for cyclic loading is introduced.