A CYCLIC LOADING TEST OF COMPOSITE MEMBER

The composite bridge column aiming high-speed construction time, has significant features that several steel tubes are placed inside the section and high strength strand are set spirally. The cyclic loading test has focused on the moment capacity, composite action and placing effect of steel tubes using beam-type model, and the effect of lateral reinforcing ratio and width/depth ratio of cross section for ductility, and shear strength using column-type model. The following result were obtained that the maximum moment capacity coincides with the calculated value assuming perfect bond action between steel tube and concrete, and the ductility was better. On the other hand, the behavior of shear failure was ductile due to the existence of steel tube.