Study on Axial Compression Behavior of Hollow Angle Steel-Concrete Encased CFST Composite Columns
The axial compression properties of hollow angle steel-concrete encased CFST composite columns were studied and the corresponding simplified calculation formula was solved.The finite element method was used to calculate the force-strain relationship for such sections and it was compared with existing test data for verification.On this basis,the working mechanism of the failure mode,internal force distribution and contact stresses of the members were analyzed.The axial compression bearing capacity of the columns were analyzed by using the hollow ratio and steel ratio under different material strength as the primary parameters.When the hollow ratio increases from 30％to 50％and 70％,the ultimate load capacity decreases by 9.64％and 22.69％,respectively;When the steel ratio increases from 5.0％to 6.0％and 7.0％,the ultimate load capacity increases by 8.72％and 16.21％,respectively.The maximum difference between the axial compression load capacity formula test results and the finite element results is just 2.8％by introducing the enhancement coefficient of concrete strength k.The simplified calculation formula can better predict the axial compression bearing capacity of the component.The hollow concrete-encased steel angles CFST composite columns still have good axial compressive load bearing capacity to meet engineering applications.
hollow angle steel-concrete-encased CFST composite columnsaxial compressionenhancement coefficient of concrete strengthsimplified formula of bearing capacity
万方数据
维普
