Analysis Of Concrete-Encased CFST Stub Columns Under Eccentric Compression After Exposure To Fire

In recent years,the concrete filled steel tubular columns used more and more widely,more and more experts and scholars participating in the research of the concrete filled steel tube composite column's performance.In recent years,the concrete filled steel tubular columns in various fields have made and show some results.With the continuous development of the building,high-rise and high-rise buildings are more and more in demand,so the building of refractory material must be taken seriously.In the study of concrete filled steel tubular columns among the members study on the development of fire resistance is relatively slow,but the fire resistance and its application on the architecture is important.In this paper,the concrete filled steel tubular composite short columns are taken as the object,and the ABAQUS finite element analysis software is used as the platform:The author through example two predecessors,to illustrate the feasibility of the ABAQUS finite element analysis software;through literature and papers,determinate and use the thermal coefficient of the composition of the concrete filled steel tubular columns of the two main materials,and establish the steel pipe concrete temperature field in different time by fire under;when the temperature field is ready,the thermal coupling using ABAQUS finite element analysis software.Analysis model is established after the fire steel tube reinforced concrete column subjected to eccentric compression,with the stress and strain of component each component of the data analysis and curve drawing;after finite element analysis of eccentric load after fire,the parameters of the components were analyzed in the presence or absence of steel pipes,the time of fire,the ratio of internal reinforced concrete,the eccentricity,and the thickness of steel pipes,and draw the different parameters of the curve graph.