Evaluation of Shear Strength Degradation after Flexural Yielding of RC Member

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The degradation process of shear strength after flexural yielding of RC member subjected to cyclic loading was evaluated numerically and experimentally.Regarding numerical method, 3D Rigid Body Spring Model (3D RBSM) was used. Firstly, shear failure after flexural yielding of RC beam subjected to cyclic loading was simulated and applicability of 3D RBSM was confirmed. Then, a method which can evaluate the degradation process of shear strength after flexural yielding was proposed. It was shown that the strength degradation curve obtained by analysis shows similar behavior with the equation obtained by statistical procedure. Moreover, the effects of web reinforcement ratio, axial force and tensile reinforcement ratio on shear degradation curve were evaluated. On the other hand, a method to evaluate shear strength degradation experimentally was proposed and the effectiveness of the proposed method was confirmed.