The behavior of deep beams failed in shear with shear span ratio (a/d) of 0.5 was investigated using 3D-RBSM, which is a representative method of discrete method. The analytical results for the beam without web reinforcement were compared with the experimental ones and analysis capability of 3D-RBSM was confirmed. 3D effects were discussed by comparing the change of strut widths and high stress as well as 3D deformed shapes. Then, the effect of web reinforcement was investigated. It was confirmed that, there is no significant effect of web reinforcement in deep beams with a/d=0.5.
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