Mechanical properties of special-shaped concrete-filled steel tube columns under eccentric compression

Abstract

Special-shaped concrete-filled steel tube (SCFST) columns have been extensively used in residential buildings owing to their excellent mechanical properties and architectural benefits. In this study, five groups of eccentric compression tests were conducted to study the mechanical properties of SCFST columns with respect to the axial force and bending moment around the centroidal principal axis, using the eccentric distance and eccentric direction as the parameters. ABAQUS software was used to construct finite element models. The model results fit well with the experimental results. Based on the experimental study and finite element simulation with reference to the standards of different countries, a formula for calculating the in-plane stability of SCFST columns under the axial force and bending moment around the centroidal principal axis was derived. The findings of this study could provide guidance for future engineering design.