2017 Volume 73 Issue 1 Pages 70-81
Shear resistant mechanism was evaluated by using the detailed stress distribution obtained from analysis of RC beam failed in shear. First, the validity of the local stress distributions of concrete and stirrups obtained from 3-D RBSM was confirmed by comparing the test results of RC beams failed in shear. Next, the applicability of decoupling shear resistant mechanism of beam and arch actions using the stress distributions obtained from analysis was presented. In addition, it was clarified that based on the analytical results, shear resistant mechanism at shear strength of the analyzed RC beams was composed by arch mechanism and truss mechanism in beam action independent on web reinforcement ratio. As a result, the necessity for redesigning the shear strength equation based on the shear resistant mechanism was proposed.