Experimental study of axial compressive performance of UHPC-encased CFST composite stub columns

被引：0
|
作者：
Wu Q. [1 ,2 ]
Xu Z. [1 ]
Yuan H. [1 ,3 ]
Qin Z. [4 ]
机构：
[1] College of Civil Engineering, Fuzhou University, Fuzhou
[2] Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou
[3] Fujian Provincial University Key Laboratory of Engineering Structures, Fuzhou University, Fuzhou
[4] Fujian Transportation Planning and Design Institute Co., Ltd, Fuzhou
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷 / 12期
关键词：
axial compression test; axial compressive bearing capacity; concrete-encased CFST composite column; failure pattern; finite element analysis; UHPC-encased;
D O I：
10.14006/j.jzjgxb.2022.0602
中图分类号：
学科分类号：
摘要：
To enhance the axial compressive bearing capacity and durability of concrete-encased concrete-filled steel tubular columns (referred to as OC-CFST columns), a novel approach utilizing ultra-high performance concrete (UHPC) encased CFST (UC-CFST columns for short) was proposed. A total of 22 stub column specimens were tested under axial compression, including nine UC-CFST columns, nine OC-CFST columns, and four CFST columns. The investigation aimed to assess the impact of encasing material strength and area ratio on the axial compressive performance and failure mode. Finite element models of the UC-CFST stub column were established using ABAQUS, and a parameter analysis of axial compression performance was conducted on the stub columns with real structural dimensions. The results reveal that during failure of OC-CFST stub columns, the encasing ordinary concrete suffers extensive peeling, while UC-CFST stub columns experience relatively intact due to the bridging effect of steel fibers within the UHPC. Compared to the OC-CFST stub columns, the UC-CFST stub columns exhibit significantly improving axial compressive stiffness and axial compressive bearing capacity, and reach axial compressive bearing capacity when the UHPC encasing reaches its peak compressive strain. Furthermore, while maintaining the outer diameter of composite columns constant, the axial compressive bearing capacity of UC-CFST stub columns demonstrate an approximately linear increase with the rise in area ratio of encasing concrete, while the OC-CFST stub columns exhibit a linear decreasing trend. Finally, the applicability of using the formula in the current technical specifications for steel tube-reinforced concrete column structures to calculate the axial compressive bearing capacity of UC-CFST stub columns was analyzed. Based on this formula, it was recommended not to consider the additional coefficient of 0. 9 and a new calculation method was proposed to accurately determine the axial compressive bearing capacity of UC-CFST stub columns. © 2023 Science Press. All rights reserved.
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页码：183 / 193
页数：10
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