Multi-scale identification of concrete material parameters

A multiscale method for determining fracture related material parameters in concrete is presented. A homogenized constitutive law is used in the coarse-scale while the fine-scale accounts for the meso-scopic features of concrete, i.e. the cement matrix, micro-cracks and aggregates. The fine-scale and the coarse-scale is coupled by the Lagrange multiplier method. A meshless method is applied where material failure is modeled by the extended element free Galerkin method. The well-posedness of the boundary value problem is restored by means of cohesive zone approach. The interface between the cement matrix and the aggregates are also modeled through the cohesive zone approach. The validity of the method is shown for two benchmark problems with available experimental results.