Behaviour of tapered concrete-filled double skin steel tubular (CFDST) stub columns

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• 作者：Wei Li^a ; Qing-Xin Ren^a ; ^b ; Lin-Hai Han^a ; ^{lhhan@tsinghua.edu.cn} ; Xiao-Ling Zhao^c
• 关键词：Concrete-filled double skin tubes (CFDST) ; Tapered ; Stub columns ; Confinement effect ; Compressive strength
• 刊名：Thin-Walled Structures
• 出版年：2012
• 期刊代码：175_02638231
• 类别：et
• 出版时间：August, 2012
• 卷：57
• 期：Complete
• 页码：37-48
• 文件大小：1531 K

摘要

Recently, tapered concrete-filled double skin steel tubular (CFDST) columns have been applied in electricity transmission towers in China. However, there is still lack of information on the behaviour of such kind of members. This paper thus carried out the investigation on axially loaded tapered CFDST stub columns. The parameters included the tapered angle and the sectional profile. A finite element analysis (FEA) model was developed to predict the behaviour of the tapered member as well. The results showed that the steel tubes and the sandwiched concrete could work together well despite the tapered angle. The failure mode of the tapered CFDST stub column was similar to that of the straight one, and the failure occurred near the smallest section. The confinement effect of the tapered member was discussed by using the stress analysis. Finally, formulas were suggested for the calculation on the ultimate strength of the tapered CFDST stub column.