Theoretical model for double-skinned concrete-filled-steel-tubular columns with external confinement

摘要: Recent advances in the production of super-fine cement and filler technology has made high-strength concrete (HSC) 120 MPa practicable industry. Nonetheless, application such HSC real construction is still limited. One reasons that inhibits use brittleness, which causes structures to fail explosively if confinement not adequate. The traditional method installing transverse steel as feasible structures, will be too congested ensure proper placing. To overcome problem, double-skinned concrete-filled-steel-tubular (HSCFST) columns been advocated, could provide large, continuous uniform HSC. However, a major shortcoming HSCFST imperfect interface bonding occurs at elastic stage reduces strength stiffness columns. improve situation, authors have verified previously using external rings on outer tube can successfully restrict dilation thus restore an intact condition. As continued study, this paper develop theoretical model for predicting uni-axial load-carrying capacity doubled-skinned