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

Abstract. In this paper, a numerical model for the analysis of bond-slip occurring in
concrete filled steel tube (CFT) columns is introduced. Unlike the classical
bond-link or bond-zone element using double nodes, the introduced model
considers the bond-slip effect without taking double nodes by incorporation
of the equivalent steel stiffness. Upon constructing the equations system on
the basis of the force equilibrium and the compatibility condition at each
nodal point, the deformations in a steel tube are determined, followed by
evaluation of the bond-slip. Moreover, as a part of solving the equations
system to evaluate the slip behavior, the mechanical properties for steel and
bond-slip have been changed and updated through an iteration procedure.
Finally, the validity of the introduced numerical model is verified by
comparing the experimental data with the analytical results for CFT columns
subjected to axial force and bending moment.
