Reinforced concrete bridge columns with hollow section subjected to inelastic cyclic loading have been reported to suffer from the damage at not only outside but also inside of columns, where is invisible at the bridge inspection. Therefore it is important in the seismic design to determine the acceptable limit-state for the RC hollow columns in terms of inspectability and repairability. However there are few researches on the seismic performance of the RC columns with hollow section, particularly with high longitudinal steel ratio and high axial loading.In this study, the failure mode and damage progress at inside and outside of the section of the reinforced concrete column with hollow section were clarified based on the cyclic loading tests for scaled-model columns. And the effect of axial loading on the seismic performance of the RC hollow columns was also investigated. |