In order to study the influence of the concrete composition and the loading conditions on the material behavior, fracture processes were simulated on the mesolevel. For generating the mesolevel concrete structure consisting of aggregate particles and the surrounding mortar matrix…
In order to study the influence of the concrete composition and the loading conditions on the material behavior, fracture processes were simulated on the mesolevel. For generating the mesolevel concrete structure consisting of aggregate particles and the surrounding mortar matrix a new stochastic- heuristic algorithm has been developed. The algorithm attains comparably high aggregate contents in 2D as well as 3D models. Two approaches for simulating cracking were used. A 2D particle model based on in linear-elastic fracture mechanics allows to separately investigating some influences of the concrete composition on the fracture process under compression. Furthermore, compression as well as direct tension tests have been simulated using 2D and 3D truss models. In addition, 2D simulations of wedge splitting tests were carried out. For describing the element behavior, different non-linear constitutive relations were applied. Steel fiber reinforcement was modeled by introducing additional truss elements into the mesh.