Test on seismic performance of concrete filled steel tube with circumferential gap reinforced by studs

被引：0
|
作者：
Li Y. [1 ]
Ning Z. [1 ]
Li Z. [2 ]
Liu C. [1 ]
Shan H. [3 ]
机构：
[1] School of Civil Engineering, North University of Technology, Beijing
[2] Central Research Institute of Building and Construction Co., Ltd. MCC Group, Beijing
[3] Zhonghe Dehui Engineering Technology Co., Ltd, Beijing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷
关键词：
CFST; circumferential gap defect; low cycle loading test; seismic performance; studs;
D O I：
10.14006/j.jzjgxb.2023.S2.0017
中图分类号：
学科分类号：
摘要：
In order to investigate the effect of circumferential gap on the seismic performance of concrete-filled steel tube (CFST) columns, three CFST column specimens with different internal configurations were designed. Low-cycle loading tests were conducted to study the influence of circumferential gap on the failure mode, hysteretic behavior, horizontal load-bearing capacity, rotation ductility factor, stiffness and strength degradation, and energy dissipation capacity of the CFST specimens. The results indicate that the gaps defect significantly diminish the constraining effect of the steel tube on the core concrete, weakening their collaborative capacity. Consequently, the bearing capacity and rotation ductility factor of the specimens decreased by 16. 29% and 33. 03% compared to concrete filled steel tube columns without gap, respectively; Studs inside the steel tube can significantly improve the constraining effect of the steel tube on the concrete, facilitating greater collaboration between the steel tube and the core concrete. This results in a 5. 63% increase in the bearing capacity of CFST columns with circumferential gaps defects, while the enhancement in rotation ductility factor is more pronounced at 9. 05% . Additionally, the incorporation of studs can contributes to a 15. 19% improvement in the cumulative energy dissipation of the CFST column with circumferential gap defects. © 2023 Science Press. All rights reserved.
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页码：173 / 179
页数：6
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