LATERAL DEFORMATIONS ANALYSIS OF REINFORCED CONCRETE COLUMNS INCOPARATING BOND-SLIP AND SHEAR EFFECTS

Flexural-shear failure and shear failure of reinforced concrete (RC) columns under seismic loading are critical issues that may cause the loss of axial capacity and even collapse of a structure. Extensive experimental studies indicate that the lateral deformation of RC columns consists of deformations induced by flexural, bond-slip, and shear effects. The combined effects of the three components define the lateral load-deformation characteristics of RC columns. Based on the studies on each deformation component, the paper proposes a macro-element model incorporating bond-slip and shear effects into the numerical analysis of RC columns. The developed model is used to simulate three RC columns under reversed static cyclic loading and analyze the progression of deformation components as well as their contributions to the total deformation. Comparison of the numerical results and experimental results validate that the efficacy of the proposed model for the analysis of the progression of load-deformation behavior for shear-critical members under lateral loading.