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

作　　者：陈安英[1,2] 王晨曦 王瀚钦 完海鹰[1] 王兆峰 CHEN Anying;WANG Chenxi;WANG Hanqin;WAN Haiying;WANG Zhaofeng(College of Civil Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Key Laboratory of CivilEngineering Structures and Materials,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]合肥工业大学土木工程结构与材料安徽省重点实验室,合肥230009

出　　处：《建筑钢结构进展》2024年第4期46-56,共11页Progress in Steel Building Structures

基　　金：安徽高校协同创新项目(GXXT-2019-005)。

摘　　要：为了研究大高宽比矩形钢管混凝土柱的压弯性能,对大高宽比钢管混凝土短柱进行偏压试验并结合有限元模拟补充了4组试件进行对比,包括不同偏心率、高宽比、钢管壁厚度、截面尺寸情况下柱性能的对比分析。最后参考常用的4本国内外规范进行柱承载力计算,对比并判断现有规范是否适用。结果表明:试件破坏模式均为长边鼓曲,当荷载小于极限承载力的80%时,横截面高度上的应变分布服从平截面假定;随着偏心率增大,柱延性提升,在偏心率超过0.205后,柱延性开始下降;随着壁厚增加,柱延性提升,在壁厚达到8 mm后,柱延性开始下降;随着高宽比提升,柱延性降低;随着截面尺寸增大,在壁厚不变的情况下,柱延性降低,在壁厚等比例增大时,柱延性变化不大;随着高宽比、截面尺寸、钢管壁厚度的增大,柱承载力提升;随着偏心率升高,柱承载力降低;参考规范JGJ 138—2016对大高宽比钢管混凝土柱偏压承载力的计算更为准确。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 

分 类 号：TU398.9[建筑科学—结构工程]