Experimental Study On The Hysteresis Behaviors Of Composite-Sectioned Concrete Filled Stainless Steel Tubular Columns

Composite-sectioned concrete-filled steel tube(CFST)column is consists of a circular steel tube embedded in the concrete filled square steel tube column.The CSFT column effectively combines the advantages of connection convenience of the square steel tube joint and the good confinement effect of circular steel tube.Composite-sectioned concrete filled stainless steel tubular(CFSST)reinforced by circular steel tube,which effective toreduce corrosion and looks beautiful.At present,there are researches on the mechanical properties of CFST,CFSST column.Till now experiment study on the hysteresis behavior of the CFSST column has not been performed yet.In this paper,quasi-static tests and the Finite element Modeling(FEM)based on software ABAQUS are carried out to investigate the hysteresis of the CFSST column.The main works and outcomes are as follows:(1)Quasi-static tests on six specimens were completed,including five CFSST column and one concrete-filled stainless steel tube column.The main parameters included: the width-to-thickness ratio of square steel tube,the diameter-to-thickness ratio of circular steel tube,the diameter-to-width of circular steel tube and square steel tube.The hysteresis behavior of CFSST column,including the failure mode,load-carrying capacity,deformation capacity,energy dissipation capacity and deformation capacity,are studied and revealed.The test results indicated that excellent hysteresis behavior is achieved since the hysteresis curve is full.(2)The FEM of CFSST column based on the software ABAQUS were established,and the mechanisms of load-deformation relationships of CFSST column were systemically analyzed.The predicted results produced by FEM agreed well with the test results,which verified the reliability of FEM based on ABAQUS.The influence analysis of parameters,including axial compression ratio,the width-to-thickness ratio of square tube,and strength ratio of square tube and circular tube,was carried out based on ABAQUS model.The results further revealed the whole loading process and working mechanism of CFSST column.