Abstract
This paper presents the results of an experimental study into the behavior of concrete-filled steel tube columns confined by fiber-reinforced polymer (FRP). Eleven columns were tested to investigate the effects of the FRP layer number, the thickness of the steel tube and concrete strength on their load capacity and axial deformation capacity. The experimental results indicated that the FRP wrap can effectively confine the concrete expansion and delay the local buckling of the steel tube. Both the load capacity and the axial deformation capacity of concrete-filled steel tube columns can be substantially enhanced with FRP confinement. A model is proposed to predict the load capacity of the FRP-confined concrete-filled steel tube columns. The predicted results are generally in good agreement with the experimental ones obtained in this study and in the literature.
Highlights
Concrete-filled steel tube (CFST) columns have been widely used in modern structural systems
The nomenclature consists of three items: the letters CF and GF in the first item denote the carbon fiber-reinforced polymer (CFRP)-confined specimens and glass fiber-reinforced polymer (GFRP)-confined specimens, respectively, followed by the fiber-reinforced polymer (FRP) layer number; the letter t and the following number in the second item indicates the steel tube and its thickness; the letter C in the third item is followed by the nominal concrete strength
FRP-confined concrete-filled steel tube (FCCFST) specimens failed by rupture of the FRP wrap in the mid-height region, as a result of the lateral expansion of the concrete
Summary
Concrete-filled steel tube (CFST) columns have been widely used in modern structural systems. In the CFST columns, the inward buckling deformations of the steel tube can be prevented by the concrete core, but inelastic outward local buckling can result in the degradation of steel confinement, strength and ductility [1,2]. To improve the structural behavior of CFST columns, several researchers have studied the effectiveness of the FRP confinement. Hu et al [7] performed compressive tests on the FRP-confined concrete-filled steel tube (FCCFST) columns. They studied the parameters of the thickness of the steel tube and the FRP layer number. Eleven columns were tested to study the parameters of the FRP layer number, the thickness of the steel tube and the concrete strength. The predictions are compared with the experimental results in this study and in the literature
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