Experimental Study On Eccentric Compressive Behavior Of Spatial Steel Frame Concrete Short Column With Inner Square Tubes

With the continuous development of high-rise buildings and super high-rise buildings,the bearing capacity and deformation performance requirements of the columns in the building structure are getting higher and higher.The combined structure has its outstanding advantages is widely used in practical engineering.This paper proposes a new type of composite column—spatial steel frame concrete short columns with inner square steel tubes.The core square steel pipe and the space steel frame in the combined column have good lateral restraint effect on the inner and outer concrete of the steel pipe.In this paper,the eccentric compression test of six spatial steel frame concrete short columns with inner square steel tubes is carried out,and nonlinear finite element simulation analysis is carried out on the basis of experimental research to explore the main influence of the eccentricity of the combined column on the pressure performance.The factors and the formula for calculating the eccentric compression bearing capacity of the combined column are derived.In this test,six spatial steel frame concrete short columns with inner square steel tubes were designed and fabricated with lacing bar separation distance of the space frame and the eccentricity of the specimen as the design parameters,and the eccentricity of the pressure performance test was carried out.The analysis of the test results shows that the eccentricity is one of the important factors affecting the eccentric compression bearing capacity of spatial steel frame concrete short columns with inner square steel tubes.The reduction of the spacing of the slats can improve the eccentric compression peak load of spatial steel frame concrete short columns with inner square steel tubes.Based on the experimental research,this paper selects ABAQUS finite element software to build the spatial steel frame concrete short columns with inner square steel tubes model,simulates the existing experiment,and verifies the correctness of the model establishment.On this basis,the factors affecting the eccentricity of the combined column by the eccentricity,the angle of the angle of the angle of the steel,the spacing of the strips,the width-thickness ratio of the square steel tube,and the strength grade of the concrete are analyzed,and the influence of the parameters is obtained law.Based on the experimental research,finite element simulation analysis and the existing related theories,the calculation formula of the eccentric compression bearing capacity of the spatial steel frame concrete short columns with inner square steel tubesis proposed.The analysis shows that the test results are in good agreement with the calculated results,and the formula can be used to calculate the eccentric compression bearing capacity of the combined column.