Behavior of L-Shaped Concrete-Filled Steel Tubular Columns Subjected to Axial-Compression

The mechanism of L-shaped concrete-filled steel tubular column subjected to axial-compression is studied based on experiment and the constitutive relations of the core concrete of concrete-filled steel square tubular column.A constitutive relationship of the core concrete confined by L-Shaped steel tube is put forward,with the restriction of steel tube to concrete as an equivalent confinable effect coefficient ξDB.Nonlinear finite element method analysis on L-shaped concrete-filled steel tubular column is carried out by using ABAQUS software.Determination methods for the constitutive models of steel and concrete,interface model between the steel tubes and the concrete are presented.The load-deformation relationships of L-Shaped concrete-filled steel tubular columns subjected to axial compression are analyzed,and the calculation results are in good agreement with experimental results.The typical load-deformation relationship curves of L-shaped concrete-filled steel tubular column subjected to axial-compression shown could be defined as following three stages: elastic,elastic-plastic and softening stage.Parametric analyses are conducted at the added coefficient of bearing capacity of L-shaped concrete-filled steel tubular column to investigate the influence of width-thickness ratio,length-width ratio,yield strength of steel tube and strength of the core concrete