Abstract
Introduction: With stronger confinement effects, the composite CFST column exhibits higher ultimate bearing capacity and better seismic performance than ordinary CFST column, so it has a broad application prospect in the field of structural engineering. Methods: This paper summarized recent researches on the axial compressive behavior of two typical composite CFST columns including the section of outer square tube-inner circular tube and the section of double circular tubes. Parameter analysis on axial compressive behavior was presented in detail according to all the experimental and theoretical results of the composite CFST columns. Result and Conclusion: The different axial compression ultimate bearing capacity formulas were compared based on the experimental results. Simultaneously, the insufficiencies of present work were pointed out. Lastly, suggestions for further study in this field were put forward.
Highlights
With stronger confinement effects, the composite CFST column exhibits higher ultimate bearing capacity and better seismic performance than ordinary CFST column, so it has a broad application prospect in the field of structural engineering
The composite CFST column has high bearing capacity due to the confining force to the core concrete supported by steel tubes
It was concluded that the bearing capacity of the composite CFST column depends on the dual confinements from both outer and inner steel tube set on the inner concrete
Summary
This paper summarized recent researches on the axial compressive behavior of two typical composite CFST columns including the section of outer square tube-inner circular tube and the section of double circular tubes. Parameter analysis on axial compressive behavior was presented in detail according to all the experimental and theoretical results of the composite CFST columns. Result and Conclusion: The different axial compression ultimate bearing capacity formulas were compared based on the experimental results. The insufficiencies of present work were pointed out. Suggestions for further study in this field were put forward
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