Finite Element Analysis of Bearing Capacity for Recycled Concrete-filled Square Steel Tubular Stub Columns Under Axial Compression

Nonlinear analysis of bearing capacity for recycled concrete-filled square steel tubular stub columns under axial compression was carried out using finite element software ABAQUS.The authors put forward the modified model of the constitutive relationship of steel and recycled concrete,and deduced the function relation of ultimate bearing capacity formula of concrete-filled square steel tubular stub columns under axial compression by using ultimate equilibrium method.The finite element calculation results were used to fit the ultimate bearing capacity formulae of recycled concrete-filled square steel tubular stub columns.The study results indicate that the modified formulae of recycled concrete constitutive relationship can meet the requirements of regeneration stub columns under axial bearing capacity well.There are small differences between finite element calculation results and related test results.The established calculation formulae of bearing capacity for recycled concrete-filled square steel tubular stub columns under axial compression can calculate the ultimate bearing capacity of members accurately.