Abstract
Almost of past studies on failure mode and seismic ductility of RC columns are for members with many hoop reinforcements, and a few studies are for members with few or no hoop reinforcements. On the other hand, many existing RC piers with rather large section have few hoop reinforcements, and seismic capacities of these structures should be made clear. In this studies static, reversal cyclic loading tests were taken by using the reduction models of RC column without hoop reinforcements. As a result, we showed that the collapse mode can be predicted by shear-to-moment capacity ratio (Vc′/Vmu), and the large ductility was obtained without hoop reinforcements in case of flexural collapse.
