This paper is devoted to experimental investigation and numerical modelling of induced ani- sotropic damage in concrete during drying shrinkage. In the first part, a summary of experimental result is presented. A prismatic bar is subjected to drying process through…
This paper is devoted to experimental investigation and numerical modelling of induced ani- sotropic damage in concrete during drying shrinkage. In the first part, a summary of experimental result is presented. A prismatic bar is subjected to drying process through its four lateral faces during one year. A cu- bic sample is then cut from the prism and submitted to hydrostatic compression. Strains in three orthogonal orientations are measured by strain gauges glued on six faces of the cube. The results clearly show anisotropic deformations between the orientations which are respectively parallel and perpendicular to principal desicca- tion direction. In the second part, an elastoplastic damage model is proposed. A second rank tensor is used to describe orientation and density of microcracks. The effective elastic properties of damaged material are de- rived from a suitable form of free energy function, which is based on micromechanics analysis. A pragmatic damage criterion is proposed so that the damage evolution is related to tensile elastic and plastic strains. Simulation of laboratory tests show that the model is able to describe basic characteristics of induced aniso- tropic behaviour of concrete. A simple application example is finally provided.