The purpose of this study is to examine the confinement effects of supplementary ties in reinforced concrete columns. 16 short tied columns are tested. The supplementary ties used have 180° hooks at both ends or at one end. In the two test specimens the tie with 180° hooks at both ends are engaged with longitudinal steel bars and in the other test specimens the ties are engaged with a perimeter tie. The test specimens are subjected to monotonic and cyclic loading. Based on the test results, the stress-strain curves of confined core concrete are obtained and the results are compared with the model which has been proposed by the authors. It is concluded that the authors' model on the stress-strain curves of confined core concrete is valid for the confinement effects of supplementary ties.