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.
关键词
中空角钢-钢管混凝土叠合柱/轴压性能/混凝土强度增强系数/承载力简化计算
Key words
hollow angle steel-concrete-encased CFST composite columns/axial compression/enhancement coefficient of concrete strength/simplified formula of bearing capacity
维普
万方数据