| With the continuous development of China’s economy and society,the height of high-rise buildings is also increasing,and the requirements for the seismic performance of columns are also increasing.The traditional reinforced concrete columns can not meet the requirements,so it is necessary to explore a new type of steel-concrete composite columns.In this paper,a concrete-filled square steel tubular composite column with embedded space steel frame is proposed,and its eccentric compression performance is studied.In this paper,the experimental study on the eccentric compression performance of 9square CFST short columns with embedded space steel frame is carried out.Combined with ABAQUS nonlinear finite element analysis,the comprehensive analysis and deep research on the eccentric compression performance of square CFST short columns with embedded space steel frame are carried out,and the square CFST short columns with embedded space steel frame are deduced by two methods The formula of eccentric compression bearing capacity.In this paper,based on the parameters of 9 test specimens,a finite element model is established by using ABAQUS nonlinear finite element software,which verifies the load displacement curve of the test and the load displacement curve of the test.Taking the eccentricity,the thickness of the outer square steel tube and the spacing of the battens as the parameters,the correlation between mu and Nu of the concrete-filled square steel tube short columns with different eccentricities is explored.The influence of the change of batten spacing and the thickness of the outer square steel tube on the correlation between mu and Nu of the concrete-filled square steel tube short columns with different eccentricities.In this paper,the ABAQUS nonlinear finite element software is used to establish a finite element model based on the parameters of nine test specimens,to verify the load displacement curve of the test,and to verify the accuracy of the ABAQUS finite element model from the degree of agreement between the test curve and the simulation curve.Taking eccentricity,thickness of outer square steel tube and batten spacing as parameters,this paper explores the relationship between Mu and Nu of concrete-filled square steel tube short columns with different eccentricities,and compares the influence of batten spacing and thickness of outer square steel tube on the relationship between mu and Nu of concrete-filled square steel tube short columns with different eccentricities.The combination relationship between steel frame and outer steel tube is also explored.Based on the experimental data and ABAQUS nonlinear finite element analysis data,this paper deduces the formula of eccentrically loaded capacity of square CFST short columns with embedded spatial steel frame.By using the formula of eccentrically compressed bearing capacity,the bearing capacity of 9 specimens is calculated,and the comparison between the test value and the calculated value proves the rationality of the formula of eccentrically compressed bearing capacity of square concrete filled steel tubular short columns with embedded space steel frame. |
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