Shear Deterioration of Reinforced Concrete Beams Subjected to Reversed Cyclic Loading

摘要

This paper provides a method to predict the ductile capacity of reinforced concrete (RC) beams that fail in shear after flexural yielding. The proposed method takes into account shear strength deterioration in the plastic hinge region of RC beams. The shear contribution of the concrete in the plastic hinge region decreases after flexural yielding of the beam due to a decrease in the effective compressive strength of the concrete. In this paper, the shear deterioration of RC beams after flexural yielding is predicted by using a compatibility-aided truss model that takes into account the axial strain at the center of the beam's cross section. To verify the shear strength and the corresponding ductility of the proposed method, 12 RC beams were tested under reversed cyclic loading. Comparisons between the observed and calculated shear strengths and their corresponding ductilities of the tested beams showed reasonable agreement.