The effect of slenderness ratio on the mechanical properties of high-strength circle steel tube high-strength concrete axial compression members with inner I-shaped CFPR profiles was studied,which provided a basis for the design of this type of column.Methods The finite element simulation of the composite column was carried out by using ABAQUS finite element software,and the influence of steel strength,concrete strength and other parameters on the mechanical properties of the composite column under different slenderness ratios was analyzed.Results The slenderness ratio of the limit of elastic and elastoplastic instability failure of the composite column is 66.67,and the average error between the predicted value and the simulated value of the verified theoretical formula is 3.01%.Compared with the steel strength,the concrete strength has a greater impact on the ultimate bearing capacity of the components,and the steel yield strength has less influence on the proportion of the internal force distribution of the steel pipe.In the composite components,the load proportion borne by high-strength concrete can reach at least 1.2 times that of ordinary strength concrete.Conclusion The purpose of improving the bearing capacity of components with elastic instability failure can be achieved by increasing the concrete strength.Compared with ordinary strength concrete,the use of high-strength concrete and high-strength steel pipe in the composite column can make the composite column have a better combination effect.The improvement of the ultimate bearing capacity of the I-shaped CFRP for the composite column is mainly reflected in the components with elastic-plastic instability failure.
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