Analysis On Concrete-filled Inequiaxial L-shaped Steel Tube Column Under Axial Compression And Bending Moment

Firstly,the finite element software ABAQUS has been used to simulate and analyze the experiments in relevant literatures.By comparing test results and software calculation results,this paper has proved the correctness of the modeling method.Then the three dimensional finite element model of concrete-filled inequiaxial L-shaped steel tube column has been established to analyze the ultimate bearing capacity,working mechanism and failure patterns.It is proved that the hypothesis of the average strain's plane cross section is applicable.The flexural shape of the concrete filled inequiaxial L-shaped steel tube column was obtained,at the same time.On the basis of above mentioned research works,the axial force-deflection program and the normal section bearing capacity calculation program are compiled by using the fiber model method.We can use these programs to calculate N-U_m curves,N-M correlation curves and M_x-M_y correlation curves.The ultimate bearing capacity of the L-shaped column has been calculated by using the above programs,and the calculation results are compared with the experimental results to verify the accuracy of the calculation.Finally,this paper analyze on the affection to the right section ultimate bearing capacity on the different loading angles,the different axial compression ratio,the different steel ratio and different strength of the concrete by the related curve of N-M interaction curves and M_x-M_y interaction curves.And analyze on the affection to the N-U_m curves on different limb ratio with the axial force-deflection program.