建筑钢结构进展2024，Vol.26Issue(4)：46-56,11.DOI:10.13969/j.cnki.cn31-1893.2024.04.006
大高宽比矩形钢管混凝土柱压弯性能研究
Compression-Bending Behavior of Rectangular Concrete-Filled Steel Tubular Columns with Large Aspect Ratio
摘要
Abstract
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.关键词
大高宽比钢管混凝土柱/受压性能/有限元分析/承载力计算Key words
concrete-filled steel tubular column with large aspect ratio/compression performance/finite element analysis/bearing capacity calculation分类
建筑与水利引用本文复制引用
陈安英,王晨曦,王瀚钦,完海鹰,王兆峰..大高宽比矩形钢管混凝土柱压弯性能研究[J].建筑钢结构进展,2024,26(4):46-56,11.基金项目
安徽高校协同创新项目(GXXT-2019-005) （GXXT-2019-005）
