콘크리트 충전 각형 강관기둥의 내진특성의 해석에 관한 연구

초록

Concrete filled tube (CFT) columns combine steel and concrete in one member, which results in a member that has the beneficial qualities of both materials. A developed monotonic stress-strain relation for confined concrete is modified for the analysis of steel tube walled section columns. The influence of steel tube on the lateral response of CFT columns is studied based on the fiber analysis method; particularly, the enhancement of the ultimate compressive strain of concrete, the increase in curvature ductility capacity based on moment-curvature relationship and yield load-displacement are investigated. Inelastic dynamic analyses of CFT columns using two ground motions recorded are conducted to evaluate the seismic performance of CFT columns. The results indicate that using CFT columns provides adequate protection against the damage potential of the ground motions and shows the enhancement of seismic capacity of structures.