| Because of the strong bending-rigidity of the cross-section, simple connection details, easier to connection with beams and decoration convenience, the Rectangular Concrete-filled Steel Tubular columns (rectangular CFST) have been increasingly applied in engineering practice. Concrete-filled rectangular steel tube stub columns stiffened by inner longitudinal ribs under axial compression (stiffened rectangular CFST) is a kind of new structure, it can enhance restriction effect of the rectangular CFST to core concrete and the ultimate load carrying capacity and ductility, prevent local buckling of the steel plates, improve the mechanical performance of rectangular CFST. In this paper, stiffened rectangular CFST was studied with the universal FEM ANSYS program. The main contents are listed as follows:(1) The stiffened rectangular CFST were tested under axial compression load.The features of deformation, failure models and failure mechanism were observed and analyzed. The test results show that longitudinal stiffener can improve the local buckling performance of stiffened rectangular CFST efficiently, and can improve its ultimate load carrying capacity.(2) On the basis of the test, stiffened rectangular CFST were simulated by FEM, considering material non-linear and geometry non-linear question simultaneously, the calculating results of FEM kept in with those from tests.(3) Concrete-filled rectangular steel tube stub columns stiffened by inner longitudinal ribs under axial compression were analysised, where height-to-width ratio were selected as main varied parameters.This paper research that K is how to be influenced by parameters a andyβ.(4) Based on the analysis of parameters, the expression of ultimate load carrying capacity was given in this paper.Conclusions of this paper can provide some reference to the research of the same kind stiffened rectangular CFST in the future.
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