STUDY OF CONCRETE FRACTURE PROCESS ZONE BASED ON FICTITIOUS CRACK MODEL

Based on the fictitious crack model, fracture process of concrete is studied in this paper. Taking the tensile fracture model for the center of an infinite plate for an example, and by expressing the opening displacement in fracture process zone in a polynomial, the distributions of displacement and cohesive stress in the fracture process zone are obtained. Furthermore, effects of the material parameters on different physical variables are analyzed, including the distribution of displacement and cohesive stress, length of fracture process zone and peak load. The results show that the stress and the displacement of the fracture process zone are both in nonlinear distributions. The length of fracture process zone gradually increases with the maximum aggregate size and decreases with the compressive strength. The peak load increases with both the maximum aggregate size and the compressive strength.