Performance Of Concrete-Filled Steel Tube Reinforced Concrete Column Subjected To Local Compression

Concrete-filled steel tube reinforced concrete columns has high bearing capacity,superior fire resistance,rust resistance and seismic performance.Therefore,the Concrete-filled steel tube reinforced concrete column is a sublimation of the traditional CFST structure,and the local compression is a Concrete-filled steel tube reinforced concrete column.The common stress state in practical engineering applications,such as the joint between the Concrete-filled steel tube reinforced concrete column and the grid.In this case,the Concrete-filled steel tube reinforced concrete column is subjected to local load from the ball joint,and the Concrete-filled steel tube reinforced concrete column is partially compressed.The research work in this aspect has not been reported yet.The purpose of this paper is to use the finite element method to clarify the mechanical properties of concrete-filled steel tubular columns under local compressive loads.In this paper,the working mechanism of the Concrete-filled steel tube reinforced concrete column under local compressive load is studied in depth.Based on the analysis of the parameters of the system,the variation law of the compressive coefficient of the Concrete-filled steel tube reinforced concrete columns is clarified.The research on the CFST superimposed columns under the compressive load provides reference.The results show that the pressure area of the steel pipe is relatively small,and the failure of the Concrete-filled steel tube reinforced concrete columns is mainly dominated by the surrounding concrete.With the larger the area ratio of the local pressure,the core concrete in the steel pipe is dominant.The greater the area ratio of the local pressure,the more significant the influence of the compressive load on the CFST composite columns,and the greater the stiffness of the end plate,the less the influence of the member on the compressive load.The analysis of the influence of various parameters show that the area ratio of the partial pressure,the strength of the surrounding concrete,the yield strength of the steel and the ratio of the steel tube in the section have a significant influence on the ultimate bearing capacity of the member.This article specifically carried out the following aspects of work:(1)In this paper,the finite element method is established by the finite element method,and the theoretical calculation method given in this paper is compared with the experimental results of previous researchers.The agreement is good,which fully demonstrates the reliability of the finite element model built in this paper.(2)The theoretical calculation method given in this paper is used to analyze the whole process of the compressive members of the CFST superimposed columns.The effects of local pressure area ratio,load eccentricity and end plate stiffness on the compressive members of CFST superposed columns were investigated.(3)The system analyzes the influence of concrete strength,steel yield strength,stirrup spacing,section steel tube ratio,longitudinal reinforcement ratio,eccentricity and local pressure area ratio on the components.