Steel and Composite Structures

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Experimental study on bearing capacity of PFCC column-RC beam joint reinforced with CST

  • Ping Wu (Department of Civil Engineering and Architecture, Anhui University of Technology) ;
  • Dongang Li (Department of Civil Engineering and Architecture, Anhui University of Technology) ;
  • Feng Yu (Department of Civil Engineering and Architecture, Anhui University of Technology) ;
  • Yuan Fang (Department of Civil Engineering and Architecture, Anhui University of Technology) ;
  • Guosheng Xiang (Department of Civil Engineering and Architecture, Anhui University of Technology) ;
  • Zilong Li (Department of Civil Engineering and Architecture, Anhui University of Technology)
  • Received : 2022.01.18
  • Accepted : 2023.03.20
  • Published : 2023.04.10
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Abstract

An experimental study of eleven PVC-FRP Confined Concrete (PFCC) column-Reinforced Concrete (RC) beam joints reinforced with Core Steel Tube (CST) under axial compression is carried out. All specimens are designed in accordance with the principle of "weak column and strong joint". The influences of FRP strips spacing, length and steel ratio of CST, height and stirrup ratio of joint on mechanical behavior are investigated. As the design anticipated, all specimens are destroyed by column failure. The failure mode of PFCC column-RC beam joint reinforced with CST is the yielding of longitudinal steel bars, CST and stirrups of column as well as the fracture of FRP strips and PVC tube. The ultimate bearing capacity decreases as FRP strips spacing or joint height increases. The effects of other three studied parameters on ultimate bearing capacity are not obvious. The strain development rules of longitudinal steel bars, PVC tube, FRP strips, column stirrups and CST are revealed. The effects of various studied parameters on stiffness are also examined. Additionally, an influence coefficient of joint height is introduced based on the regression analysis of test data, a theoretical formula for predicting bearing capacity is proposed and it agrees well with test data.

Keywords

Acknowledgement

This work was supported by National Natural Science Foundation of China (No. 52078001), Outstanding Youth Fund of Anhui Province (No. 2008085J29), Major Science and Technology Project of Anhui Province (No. 202203a07020005), and Key Research and Development Project of Anhui Province (No.2022i01020005).

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