Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

This study analytically investigated the effect of axial load ratio on the shear-dominant failure behavior of corroded reinforced concrete (RC) short columns. A previously validated macroanalytical model consisting of a nonlinear fiber element for flexural behavior, a spring element for the bond-slip behavior of reinforcing bars, and a shear spring for shear response was employed for this purpose. The analytical models were established based on specimens with different corrosion levels of transverse and longitudinal reinforcements. For each corrosion level, several analytical cases were considered by varying the axial load ratio applied to the column. The analytical results were compared in terms of the maximum shear strength, displacement at the onset of strength degradation, and load-carrying capacity. The results showed that as the axial load ratio increased, post-peak strength degradation occurred earlier, and the deformation capacity associated with the loss of load-carrying capacity decreased. This result was particularly pronounced in specimens with a high corrosion level of transverse reinforcement, indicating increased vulnerability to shear-dominant failure under higher axial load ratios.