Axial load behavior of L-shaped CFT stub columns with binding bars

被引:118
作者
Zuo, Zhi-Liang [1 ]
Cai, Jian [1 ,2 ]
Yang, Chun [1 ,2 ]
Chen, Qing-Jun [1 ,2 ]
Sun, Gang [1 ]
机构
[1] S China Univ Technol, Dept Civ Engrg, Guangzhou 510641, Guangdong, Peoples R China
[2] S China Univ Technol, State Key Lab Subtrop Bldg Sci, Guangzhou 510641, Guangdong, Peoples R China
关键词
L-shaped CFT stub column; Binding bars; Axial compression; Maximum strength; Ductility; STEEL TUBULAR COLUMNS; NUMERICAL-MODEL; BOX COLUMNS; CONCRETE; STRENGTH; DUCTILITY; CAPACITY;
D O I
10.1016/j.engstruct.2011.12.042
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper is concerned with the axial load behavior of L-shaped concrete-filled steel tubular (CFT) stub columns with binding bars provided to improve the mechanical behavior of these elements. Six specimens with binding bars and one specimen without binding bars were tested to examine the effects of horizontal spacings and diameters of binding bars, and width-to-thickness ratios of steel plates on the failure modes, maximum strength, and ductility of L-shaped CFT stub columns. Experimental results demonstrate that the local buckling of the steel tube can be delayed by setting binding bars, the confinement effects on the core concrete can be improved significantly, and the bearing capacity and ductility of the L-shaped CFT stub columns are enhanced by 7% and 26%, respectively. Based on a constitutive model of confined concrete, a method for calculating the maximum strength of L-shaped CFT columns with and without binding bars is proposed. The method is verified with experimental results from this test program and data from other experiments. The results predicted by the proposed method show better agreement with the experimental values than the values predicted by AISC (2005), BS5400 (2005), EC4 (2004) and GJB (2001). (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:88 / 98
页数:11
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