Behavior and design of axially loaded square concrete-filled double steel tubular slender columns

被引：5
|
作者：
Chen, Shicai [1 ]
Ahmed, Mizan [2 ]
Ci, Junchang [1 ]
Chen, Wensu [2 ]
Sennah, Khaled [3 ]
机构：
[1] Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing, Peoples R China
[2] Curtin Univ, Sch Civil & Mech Engn, Bentley, WA, Australia
[3] Ryerson Univ, Dept Civil Engn, Toronto, ON, Canada
来源：
ADVANCES IN STRUCTURAL ENGINEERING | 2022年 / 25卷 / 14期
关键词：
concrete-filled double steel tubular columns; slender section; axial load; design model; HIGH-STRENGTH CONCRETE; NONLINEAR-ANALYSIS; BEAM-COLUMNS; PERFORMANCE;
D O I：
10.1177/13694332221113041
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
A square concrete-filled double steel tubular (CFDST) column composed of a circular core concrete-filled tube offers the advantages of both square and circular concrete-filled steel tubular (CFST) columns. However, limited tests were performed to investigate the axial performance of CFDST slender columns. This paper investigates the behavior and design of square CFDST slender columns subjected to concentric loading. A total of eight columns, including six CFDST slender columns and two CFDST short columns were tested under concentric loading. The test parameter includes the slenderness ratio of the columns and the thickness of the inner tube. The ultimate load, failure modes and axial load-deflection relationships of CFDST slender columns are presented. It was observed that square CFDST slender columns failed due to the overall buckling of the columns together with the localized buckling of the steel tube and concrete crushing. Increasing the slenderness ratio and decreasing the thickness of the inner steel tube reduced the ultimate load of CFDST slender columns. The applicability of the existing design code of CFST columns in designing CFDST slender columns was evaluated. It was found that the existing design codes significantly underestimated the ultimate loads of CFDST columns.
引用
收藏
页码：2953 / 2965
页数：13
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