Evaluation of Shear Strength Degradation of RC Column Subjected to Cyclic Loading

When a reinforced concrete (RC) member is subjected to cyclic loading, the shear failure after flexural yielding of tension reinforcing bars (called as shear failure after flexural yielding in this study) is often observed at a small deformation, although it ordinarily suffers flexural failure and shows good deformation ability under monotonic loading.This study presented a numerical method to quantitatively evaluate shear strength degradation of RC member utilizing three dimensional Rigid-Body-Spring-Model (3-D RBSM).The behaviors of a RC column subjected to cyclic loading and repeated loading on one side were simulated by 3-D RBSM, and the behaviors of shear strength degradations were quantitatively evaluated.As a consequence, the different degradation rate of shear strength between cyclic loading and repeated loading on one side was clarified, and the reasonability of the numerical method was confirmed by comparing numerical shear strength degradation curve with previously statistically proposed degradation curves based on the test results.