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Experimental and numeral investigation on self-compacting concrete column with CFRP-PVC spiral reinforcement

  • Chen, Zongping (College of Civil Engineering and Architecture, Guangxi University) ;
  • Xu, Ruitian (College of Civil Engineering and Architecture, Guangxi University)
  • Received : 2021.04.25
  • Accepted : 2021.07.07
  • Published : 2022.01.25
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Abstract

The axial compression behavior of nine self-compacting concrete columns confined with CFRP-PVC spirals was studied. Three parameters of spiral reinforcement spacing, spiral reinforcement diameter and height diameter ratio were studied. The test results show that the CFRP strip and PVC tube are destroyed first, and the spiral reinforcement and longitudinal reinforcement yield. The results show that with the increase of spiral reinforcement spacing, the peak bearing capacity decreases, but the ductility increases; with the increase of spiral reinforcement diameter, the peak bearing capacity increases, but has little effect on ductility, and the specimen with the ratio of height to diameter of 7.5 has the best mechanical properties. According to the reasonable constitutive relation of material, the finite element model of axial compression is established. Based on the verified finite element model, the stress mechanism is revealed. Finally, the composite constraint model and bearing capacity calculation method are proposed.

Keywords

Acknowledgement

The authors would like to acknowledge the financial support provided by the Natural Science Foundation of China (51578163) and Bagui Scholars Special Funding Project ([2019] No.79), Guangxi Science and Technology Base and Talent Special Project (AD21075031) and Central Government Project for Guidance of Local Scientific and Technological Development (ZY21195010). They would also like to thank all of the technicians at the Key Laboratory of Disaster Prevention and Structure Safety of Guangxi University for their assistance during the tests.

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