Considering the cracks which are related to shear failure in reinforced concrete member model subjected to four point bending, we discuss the extension behavior of fracture cracks by using the maximum energy release rate criterion. For the calculation of energy release rate, we use E-integral method by the finite element method.The numerical analyses for some ratios of shear span to effective depth (a/d) are examined. The numerical results arerepresented in the relationship between the energy release rate of shear crack and bending crack for several a/d.It becomes clear that there are two areas which either the energy release rate of shear crack or of bending crack is dominant. The detailed fracture modes of shear failure are also examined for several a/d.
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