Compression-Bending Behavior of Rectangular Concrete-Filled Steel Tubular Columns with Large Aspect Ratio
In order to study the compression-bending behavior of rectangular concrete-filled steel tubular(CFST)columns with large aspect ratio,eccentric compression tests were carried out,and four groups of specimens were compared with follow-up finite element simulation,including the comparative analysis of column performance under different eccentricity,aspect ratio,steel tube wall thickness and section dimensions.Finally,the eccentric compression bearing capacity of columns is calculated according to four commonly used domestic and foreign codes,and the applicability of the existing codes is verified by comparison.The results show that the failure modes of the specimens are the long side bulging.When the load is less than 80％of the ultimate bearing capacity,the strain distribution at the height of the cross section obeys the plane section assumption.As the eccentricity increases,the ductility of the column increases firstly,after the eccentricity exceeds 0.205,the ductility of the column begins to decrease.As the wall thickness increases,the ductility of the column increases firstly,after the wall thickness reaches 8 mm,the ductility of the column begins to decrease.With the increase of aspect ratio,the ductility of column decreases.As the section dimension increases,the ductility of the column decreases when the wall thickness is constant.When the wall thickness increases in equal proportion,the ductility of the column does not change much.With the increase of aspect ratio,section dimension or steel tube wall thickness,the bearing capacity of column increases.With the increase of eccentricity,the bearing capacity of column decreases.It is more accurate to calculate the eccentric compression bearing capacity of CFST columns with large aspect ratio by referring to the JGJ 138-2016 specification.
concrete-filled steel tubular column with large aspect ratiocompression performancefinite element analysisbearing capacity calculation
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