Abstract
This study introduces the compressive behavior of FRP-confined steel-reinforced concrete (FCSRC) columns using recycled aggregate concrete (RAC). The performance of RAC is generally inferior to the natural aggregate concrete (NAC). In terms of optimized use of different materials, FCSRC column using RAC is a promising hybrid column because of the following merits: 1) using RAC in FCSRC columns is deemed to overcome its weakness since RAC is double confined by the encased steel column and FRP; 2) local/global buckling of the encased steel section can be allayed or suppressed; 3) both concrete and steel section can be protected by FRP against harsh environmental attack. In this study, FCSRC columns with RAC under concentric compression were tested to explore the effects of replacement ratio of recycled coarse aggregates (RCAs) and FRP confining stiffness. It has been revealed that the FCSRC columns with RAC had similar compressive behavior as the FCSRC columns with NAC although the use of RAC slightly decreased the load-carrying capacity. Favorable interactions existed among FRP, concrete and steel, but full composite effect was not achieved by combining the concrete-filled FRP tube (CFFT) and steel column due to the occurrence of local buckling in the encased steel column.
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