Compression-Moment Interaction Curves of Concrete Filled Circular Steel Tubes(CFTs) Column Confined by Carbon Fiber Sheets

摘要

Concrete-filled steel tube structure has advantages such as excellent deformation capacity, energy absorption and fire-resistance. However, CFT column has the drawback of local buckling at steel tube due to the deterioration of confinement effect after steel tube yield. Recent studies have suggested confining steel tube with carbon fiber sheets to delay or control the local buckling on the tube. In this study, axial load-moment relation formula was suggested to draw the design formula for CFT column additionally confined with carbon fiber sheets. The stress-strain rela tion model of concrete reinforced with carbon fiber sheets which is used in ACI comminute 440 was used in this study to derive axial load capacity design equation and axial load-moment relation curves taking into consideration the confinement effect of carbon fiber sheets. The comparative analysis with existing test data showed that the val ues obtained from the test and suggestion were similar to each other.