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Steel and Composite Structures Volume 43, Number 2, April25 2022 , pages 257-270 DOI: https://doi.org/10.12989/scs.2022.43.2.257 |
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Steel and FRP double-tube confined RAC columns under compression: Comparative study and stress-strain model |
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Ming-Xiang Xiong, Guangming Chen, Yue-Ling Long, Hairui Cui and Yaoming Liu
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Abstract | ||
Recycled aggregate concrete (RAC) is rarely used in load-carrying structural members. To widen its structural application, the compressive behavior of a promising type of composite column, steel-fiber reinforced polymer (FRP) doubletube confined RAC column, has been experimentally and analytically investigated in this study. The objectives are the different performance of such columns from their counterparts using natural aggregate concrete (NAC) and the different mechanisms of the double-tube and single-tube confined concrete. The single-tube confined concrete refers to that in concrete-filled steel tubular (CFST) columns and concrete-filled FRP tubular (CFFT) columns. The test results showed that the use of recycled coarse aggregates (RCA) affected the axial load-strain response in terms of deformation capacity but such effect could be eliminated with the increasing confinement. The composite effect can be triggered by the double confinement of the steel and carbon FRP (CFRP) tubes but not by the steel and polyethylene terephthalate (PET) FRP tubes. The proposed analysis-oriented stress-strain model is capable to capture the load-deformation history of such steel-FRP double-tube confined concrete columns under axial compression. | ||
Key Words | ||
composite effect; FRP tube; load share; recycled aggregate concrete; steel tube; stress-strain model | ||
Address | ||
Ming-Xiang Xiong:Protective Structures Centre, School of Civil Engineering, Guangzhou University, Guangzhou 510006, China Guangming Chen:State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China Yue-Ling Long:School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China Hairui Cui:School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China Yaoming Liu:School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China | ||