Abstract

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Title:: Calculation Method on Equivalent Slenderness Ratio of Concrete-filled Steel Tube Battened Columns

Author(s):: YAN Qiao-ling; CHEN Bao-chun; XUE Jian-yang; College of Civil Engineering, Fuzhou University

Keywords:: concrete-filled steel tube; battened column; equivalent slenderness ratio; shear flexibility parameter

Abstract:: The assumptions and formulas of existing calculation methods for equivalent slenderness ratio of concrete-filled steel tube（CFST）battened columns were analyzed. The calculated ultimate load capacity results were compared with test results. Based on the shear deformation theory of battened columns, each shear deformation item and its proportion in the whole deformation of CFST battened columns were analyzed. The unreasonableness in the existing method was pointed out. According to the calculation method of multiplication algorithm for equivalent slenderness ratio of CFST battened columns,the simplified formula of shear flexibility parameter was introduced to shear factor formula. The relationship between the amplification coefficient and shear flexibility parameter was obtained through the fitting analysis. The results show that the ultimate load carrying capacity can be calculated by adopting the calculation method for equivalent slenderness ratio and stability coefficient formula in GB 50923—2013. The calculated ultimate load carrying capacity agrees well with the test result, which indicates that the proposed method on the equivalent slenderness ratio of CFST battened columns is simple, practical and enough accurate.