To investigate the bearing capacity of double-layer steel tube concrete short columns under axial compres-sion,this study used the ABAQUS finite element analysis software and the Han Linhai constitutive model to build a com-pression bearing analysis model for 14 double-layer steel tube concrete specimens.This study conducted research on selec-ting the constitutive model,element type,mesh division,contact mode between the steel tube and concrete,and finite ele-ment calculation methods to establish a reasonable and efficient finite element calculation model.The study found that in-creasing the strength grade of the core concrete can effectively enhance the axial compression bearing capacity of the speci-mens.Adjusting the diameter-thickness ratio of the inner and outer steel tubes can also improve the initial stiffness and bearing capacity,with the outer tube showing more significant effects.Increasing the hollow ratio leads to a decrease in bearing capacity,and the bearing capacity drops significantly when the hollow ratio reaches 0.6.
double steel pipe composite structurehollow ratioaxial compression capacityfinite element analy-sis
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