|主題||BEM ANALYSIS CRACK PROPAGATION IN CONCRETE|
The concept of fracture mechanics has been applied to concrete recently, and crack behaviours in concrete structures are studied. In numerical analysis on crack behaviours, the finite element method (FEM) is extensively employed. Complicated efforts, however, are required in FEM to analyze crack propagation as the nucleation of a new stress-free boundary. Thus, to model a crack in FEM, a fictitious crack model and a smeared crack model are proposed (1).
In contrast to FEM, since no internal points are required in the boundary element method (BEM), an analytical technique does not pose much difficulty to analyze crack propagation as the nucleation of a new stress-free boundary in the arbitrary direction. Consequently, crack propagation in concrete is analyzed by the BEM analysis, and results are compared with experiments.
Crack propagation in concrete is investigated, on the basis of linear elastic fracture mechanics and the BEM analysis. As the mechanical criterion for crack initiation, the critical stress intensity factor determined from AE observation and the BEM analysis was employed. The process of crack propagation in the arbitrary direction was analyzed. Crack behaviours in the analysis were in good agreement with those obtained in experiments. These results confirm the usufulness of the BEM analysis for simulating crack propagation in concrete.