DOI QR코드

DOI QR Code

Steel and FRP double-tube confined RAC columns under compression: Comparative study and stress-strain model

  • Xiong, Ming-Xiang (Protective Structures Centre, School of Civil Engineering, Guangzhou University) ;
  • Chen, Guangming (State Key Laboratory of Subtropical Building Science, South China University of Technology) ;
  • Long, Yue-Ling (School of Civil and Transportation Engineering, Guangdong University of Technology) ;
  • Cui, Hairui (School of Civil and Transportation Engineering, Guangdong University of Technology) ;
  • Liu, Yaoming (School of Civil and Transportation Engineering, Guangdong University of Technology)
  • 투고 : 2021.07.08
  • 심사 : 2022.04.06
  • 발행 : 2022.04.25

초록

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) double-tube 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.

키워드

과제정보

The authors would like to acknowledge the financial support by the Guangzhou Science and Technology Program under Project No.: 202102010407, and the National Natural Science Foundation of China under Project Nos.: 51978281 and 51678161.

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