Abstract
Recycled concrete-filled GFRP tube (CFGT) columns can not only meet the recycling of waste concrete but also use FRP tubes to improve the mechanical properties of recycled concrete. This paper proposes a new structural form of steel fiber reinforced recycled concrete-filled GFRP tube column, and carries out research on the performance of CFGT column under eccentric compression. The variables considered in the experiment include GFRP tube thickness, the replacement rate of recycled coarse aggregate (RCA), steel fiber volume content, and initial eccentric distance. The bias bearing capacity, load-lateral mid-span deflection relationship, and nominal stress–strain relationship of the columns was analyzed. The tested results indicated that the addition of steel fiber kept the core concrete relatively intact after the specimen was destroyed and finitely compensated for the negative effect of recycled concrete on the whole specimen. In addition, a finite element model which was in good agreement with the experimental results was established, and the relatively complete Nu-Mu curves and Nu/N0-Mu/M0 curves were obtained by parameter analysis. Finally, formulas for calculating the bias bearing capacity and the corresponding mid-span bending moment of CFGT columns were proposed.
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