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Steel and Composite Structures
  Volume 35, Number 1, April10 2020, pages 13-27
DOI: http://dx.doi.org/10.12989/scs.2020.35.1.013
 


Stress-strain model of weak PVC-FRP confined concrete column and strong RC ring beam joint under eccentric compression
Feng Yu, Nannan Zhang, Yuan Fang, Jie Liu and Guosheng Xiang

 
Abstract
    To investigate the stress-strain relation of PVC-FRP Confined Concrete (PFCC) column with RC ring beam joint subjected to eccentric compression, the experiment of 13 joint specimens, which were designed with principle of \"strong joint and weak column\", were presented. Several variable parameters, such as reinforcement ratio, width and height of ring beam, FRP strips spacing and eccentricity, were considered. The specimens were eventually damaged by the crushing of concrete, the fracture of PVC tube and several FRP strips. With the FRP strips spacing or eccentricity increased, the ultimate carrying capacity of specimens declined. The strain of FRP strips and axial strain of PVC tube decreased as FRP strips spacing decreased. The decrease of eccentricity would slow down the development of strain of FRP strips and axial strain of PVC tube. The slope of stress-strain curve of PFCC column decreased as FRP strips spacing or eccentricity increased. The ultimate strain of PFCC column reduced as FRP strips spacing increased, while the effect of eccentricity on the ultimate strain of PFCC was not distinct. Considering the influence of eccentricity on the stress-strain relation, a modified stress-strain model for conveniently predicting the weak PFCC column and strong RC ring beam joint under eccentric compression was proposed and it was in good agreement with the experimental data.
 
Key Words
    stress-strain relation; eccentric compression; carrying capacity; PVC-FRP; column; beam; joint
 
Address
Feng Yu, Nannan Zhang, Yuan Fang, Jie Liu and Guosheng Xiang: Department of Civil engineering and Anhui University of Technology, Maxiang Road 59, Maanshan, China
 

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