BEM Analysis of Crack Propagation in Concrete Based on Fracture Mechanics
The boundary element method (BEM) is applied to fracture mechanics. The procedure is utilized to clarify crack mechanisms and to predict crack propagation in concrete beams. Mode-I fracture of center-notched concrete beams is analyzed, on the basis of a critical stress intensity factor (KIC) criterion of the linear elastic fracture mechanics LEFM and a tensile softening model of the non-linear fracture mechanics NLFM. Results show that the tensile softening model reasonably simulates global behaviors of notched beams, although the KIC criterion could recover an essential feature of mechanical behavior. Two-domain BEM analysis is introduced to analyze crack propagation in arbitrary directions. A mixed-mode fracture of a center-notched beam subjected to anti-symmetric loading is analyzed, based on the criterion of maximum circumferential stress. Crack trajectory observed in an experiment is in good agreement with that of BEM analysis.
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