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. In this paper, a numerical model for the analysis of bond-slip occurring inconcrete filled steel tube (CFT) columns is introduced. Unlike the classicalbond-link or bond-zone element using double nodes, the introduced modelconsiders the bond-slip effect without taking double nodes by incorporationof the equivalent steel stiffness. Upon constructing the equations system onthe basis of the force equilibrium and the compatibility condition at eachnodal point, the deformations in a steel tube are determined, followed byevaluation of the bond-slip. Moreover, as a part of solving the equationssystem to evaluate the slip behavior, the mechanical properties for steel andbond-slip have been changed and updated through an iteration procedure.Finally, the validity of the introduced numerical model is verified bycomparing the experimental data with the analytical results for CFT columnssubjected to axial force and bending moment.

FE analysis of circular CFT columns considering bond-slip effect: A numerical formulation