混凝土细观断裂模拟及损伤演化表征

he present work focuses on the quantitative characterization of the propagation of crack and evolution of damage during concrete failure, by the continuous-discontinuous method combined with laser-scanning technology as well as aggregate placement algorithm. The simulations are in good agreement with the laboratory experimental results of uniaxial compressive concrete specimens. The mesoscopic damage evolution is described by the typical stage characteristics of crack initiation, propagation, penetration, and final failure. It is also shown that the mesoscopic rupture level can reveal the evolution of concrete meso-damage during failure and the fractal dimension can represent the complicated randomness of crack growth of concrete under compressions. Finally, it is found that the sigmoid-type evolution model is suitable to characterize the nonlinear process of the fractal dimension of concrete cracks under uniaxial compression.