Abstract
This paper presents the results of an experimental study on the behavior of fiber reinforced polymer (FRP)–recycled aggregate concrete (RAC)–steel double-skin tubular columns (DSTCs) under concentric compression. Influences of the concrete strength, DSTC cross-sectional shape, and aggregate replacement ratio were experimentally investigated through the test of 24 hollow-core circular and square DSTCs. Results indicate that the overall behavior and performance of RAC DSTCs closely resemble that of DSTCs manufactured with conventional concrete, which is highly promising for structural use of RAC in the construction industry. The aggregate replacement ratio has limited influence on the ultimate condition of DSTCs. On the other hand, the replacement ratio has some influence on the trend of the stress-strain curve of concrete in DSTCs, and this is more pronounced in square specimens than in circular specimens.
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