Analysis On Composite Column With Concrete Filled Thin-walled Steel Tube Under Strength

The advantage of composite column with concrete filled thin-walled steel tube includes the excellent mechanical behavior of concrete filled steel tube and overcomes the rusting of the thin-walled steel tube. This kind of column shows good economic value and widely prospect of engineering application. The analysis on thin-walled steel tube and steel reinforced concrete is surfficient comparing with the composite column. In this paper the finite element software of ANSYS was used to simulate the mechanical behavior of the composite column.The factors, including the thickness and the yield strength of the thin-walled steel tube, strength grade of the core concrete, the stirrup ratio of surrounding concrete were used to simulate and analyze the bearing capacity of the composite column. Formulas about bearing capacity of the composite column and the section stable coefficient of different composite columns were deduced in the paper. Discuss the determining factors of shear capacity and study the earthquake resistant behavior under cyclic loading with different axial force ratio, strength grade of surrounding concrete, stirrup ratio and shear span ratio.Some joint structures and relevant formulas were introduced in the end.