Abstract: An accelerated indoor corrosion test was conducted on five stocky reinforced concrete (RC) pier columns with a shear-to-span ratio of 2 using electrochemical chlorine corrosion, and a quasi-static loading test was conducted. According to the test results, the effects of corrosion damage and axial load ratio on the damage process, on the bearing capacity, on the deformation capacity and on the energy dissipation capacity of RC columns were analyzed. Through theoretical derivation, a shear behavior constitutive model of reinforced concrete based on MCFT (the modified compression-field theory) considering corrosion damage was established, and then a numerical simulation method considering the bending-shear-slip coupling effect was proposed. Comparing the simulation results with the experimental results, it can be seen that: the hysteresis curves of the column specimens obtained by the simulation method are in a good agreement with the actual hysteresis curves, and the errors of the characteristic points of the skeleton curves and the accumulated energy dissipation values are small, which indicated that the numerical simulation method considering corrosion shear behavior proposed in this study can reflect the seismic performance of corroded stocky RC pier columns more accurately. The research results can lay a foundation for the seismic performance assessment of RC piers in service with corrosion damage.