Abstract: In this work, six CFRP tube confined concrete columns were designed and fabricated with slenderness ratio, confinement effect coefficient and stirrup ratio as parameters, and the axial compression mechanical properties were tested. The experimental results show that the axial compressive mechanical properties of CFRP tube confined concrete columns are closely related to slenderness ratio, confinement effect coefficient and stirrup ratio, and the influence intensity from large to small is as follow: confinement effect coefficient, stirrup ratio and slenderness ratio. On the basis of experimental study, the axial compression performance of concrete columns confined by CFRP tubes was numerically simulated and analyzed by ABAQUS nonlinear finite element software, and the constraint mechanism of CFRP tubes on concrete columns and the constraint effect of CFRP tubes on core concrete were discussed. The research results show that the test values, bearing capacity model and numerical simu-lation analysis results are in good agreement, which verifies the reliability of the theoretical calculation model and the finite element model. On this basis, the range and types of parameters are expanded, and the influence law of various parameters on CFRP tube confined concrete colu-mns is analyzed by finite element method. The axial compressive bearing capacity of CFRP tube confined concrete column increases with the increase of confinement effect coefficient and stirrup ratio, and decreases with the increase of slenderness ratio. The confinement effect of CFRP tube can effectively improve the bearing capacity and ductility of members.
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2022, Vol. 36 
