| The cold-formed square hollow section columns are widely used in various structures such as building structure, trusses, space frames and offshore plates etc. This paper is mainly doing the research on load carrying capacity of the cold-formed square hollow section columns under axial load, The paper includes the following main contents: (1) An elastic buckling stress for cold-formed square hollow section is presented by finite element analysis, and is compared with the result given by classical elastic buckling theory;(2) The elastic-plastic non-linear behavior of the cold-formed square hollow section columns analyzed by ANSYS is presented;(3) By using material model, and geometry nonlinear analysis, the cold-formed effect to stub columns of cold-formed square hollow section is studied;(4) By using an material model, the geometry nonlinear analysis, the influence of initial geometrical imperfection to stub columns of cold-formed square hollow section is also analyzed; (5)The load carrying capacity of the cold-formed square hollow section columns, which are including the cold-formed effect and influence of initial geometrical imperfection is analyzed by non-linear finite element, and the theoretical analysis results are compared with the results of experimental study and the results calculated by specification GB50018-2002.
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