A finite element analysis of non-prescribed crack propagation in concrete

In this paper a finite element model for the study of crack propagation in concrete is presented. The approach is based on Hillerborg's concepts of discrete crack formation and fracture energy dissipation. Interface elements with initial zero thickness are inserted along the interelement boundaries and no special remeshing procedures are required. Cracks open along those interface elements at which an approximate version of the usual criterion for mode I fracture is satisfied. The constitutive behaviour and the energy dissipation along the opening interface elements are corrected to take into account the difference between the mesh-dependent directions of the opening interfaces and the predicted direction of crack formation. Numerical results for a shear beam test and a pullout test are presented and comparisons between computed and experimental results are made. (C) 1997 Elsevier Science Ltd.