Unified calculation formula on axial compressive capacity of composite columns composed of FRP,steel and concrete
With the combined application of FRP and traditional materials,scholars at home and abroad have proposed new composite column forms of FRP,steel pipe and concrete suitable for different engineering backgrounds.Considering that the constraint effect can be evaluated by a unified lateral constraint coefficient,a simple unified calculation formula was proposed for most composite columns based on FRP,steel pipe and concrete.In order to establish a unified calculation formula for the axial compression capacity of composite columns with a wide range of application,the existing composite columns of FRP,steel tube and concrete are reviewed and divided into four sections according to their constraint forms.According to the double shear unified strength theory,the reduction coefficient of steel pipe yield strength and the non-uniform constraint coefficient of square steel pipe are introduced to consider the characteristics that the axial stress of steel pipe is lower than its yield strength in the limit state,and the calculation formulas for the axial compression capacity of composite columns of four sections were derived respectively.The formula takes into account the collar index of the composite column,the reduction coefficient of the yield strength of the steel pipe and the influence of the section size of the composite column,and has a simple form and wide application range.By comparing with the experimental data,the theoretical calculated values of the unified calculation formula presented are in good agreement with the experimental values.
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