3-D Numerical Simulation of Bending Fracture of Concrete Beam Based on Meso-mechanics Damage

A method for establishing 3-D random aggregate and random mechanical parameters model on meso-level was proposed. Two numerical models of concrete beam specimens with ANSYS were established. By the flexural numerical simulation of two models, the gradual damage process, the arising and growth of crack were simulated in space. Influences of random distribution of aggregates and heterogeneity of material parameters on crack expanding and bearing capacity of specimen were researched. Results show that the flexural strength of numerical test is basically corresponding with the result of physical experiment with the same parameters. Characteristics of abnormity and discontinuity in crack arising and growth are consistent with macroscopic experiment phenomenon. The numerical model proposed by this paper provided an effective method on the mechanism study of concrete damage and fracture.