| In recent years,with the rapid development of the social economy,more and more multi-functional high-rise buildings with complex shape and comprehensive use have been built,and the requirements of the building structure for the bearing capacity and deformation performance of the columns are getting higher and higher.Steel-concrete composite structures have been widely used in modern building structures.Many scholars have proposed a new combined column structure such as steel-concrete columns.In this paper,a new type of composite column formed by combining a space steel frame with a round steel pipe is proposed,which is a spatial steel frame reinforced circular steel tube concrete composite column.A double-constrained composite column is formed by burying a space steel frame welded by angle steel and strips into a core region of a circular steel pipe column.In this paper,the eccentric compression test of nine spatial steel frame circular steel tube composite columns is carried out,and combined with ABAQUS nonlinear finite element analysis,the bias mechanical properties of the composite column are deeply and comprehensively analyzed.Derive the formula of the bias bearing capacity.In this paper,nine spatial steel frame reinforced circular steel tube concrete composite columns were designed and processed.The research parameters include eccentricity,outer steel pipe diameter-thickness ratio,internal space steel frame decoration strip spacing,and the eccentric compression test of the composite column was carried out.According to the test results,the deformation performance of the eccentrically compressed composite column is better.The diameter-thickness ratio and the spacing of the strips are two important factors affecting the bearing capacity.Different eccentric loading angles will also affect the bearing capacity and ductility of the specimen.In this paper,the finite element analysis model of nine specimens in the second chapter is established by using ABAQUS finite element software,and the simulation results are compared with the experimental results to verify the accuracy of the ABAQUS model.Then the relationship between the axial force Nu and the cross-section moment Mu under different eccentricity is analyzed by taking eccentricity,the ratio of diameter to thickness of the outer steel tube,the length and thickness of the limbs of the angle steel and the spacing and width of the patches as parameters,and the correlation curve of Nu-Mu and the influence of each parameter on the eccentricity behavior of the composite columnsare analyzed.According to the results,the hoop coefficient of steel tube and the restraint effect coefficient of internal space steel frame are two important factors affecting the bearing capacity.The bearing capacity of each specimen is calculated by using the bearing capacity formula,and the calculated value is compared with the experimental value,which verifies the accuracy and rationality of the derived formula for eccentric compression bearing capacity of spatial steel frame reinforced circular concrete filled steel tubular composite columns. |
PDF Full Text Request