ABSTRACT
Square cross-section and inverted T-shaped column specimens were divided into three groups. Seven members’ concrete strength was C30 and the column dimension was 1000 mm, 200 mm, and 200 mm. All the members were symmetrically reinforced and constructed at the same time. Group Z I’s reinforcement was carried out using four HRB400 A14 rebars, and the reinforcement ratio was 1.54. Group Z II’s reinforcement was similar to that of group Z I and the reinforcement ratio was 3.08, but strengthened with eight HRB400 A14 rebars at the bottom of columns within 15 cm.
