Axial Compression Experiment and Bearing Capacity Calculation of Thin-walled Concrete Filled-steel Tube Columns with Different Restraint Forms

被引：0
|
作者：
Wang Z. [1 ,2 ]
Feng Y. [2 ]
Lu J. [2 ]
Li X. [2 ]
Tian J. [2 ]
机构：
[1] State Key Lab. of Eco-hydraulics in Northwest Arid Region of China, Xi'an Univ. of Technol., Xi'an
[2] School of Civil Eng. and Architecture, Xi'an Univ. of Technol., Xi'an
来源：
Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2021年 / 53卷 / 01期
关键词：
Axial compression experiment; Failure mode; Spiral stiffener; Thin-walled concrete filled-steel tubular; Ultimate bearing capacity;
D O I：
10.15961/j.jsuese.202000249
中图分类号：
学科分类号：
摘要：
In order to improve the local buckling resistance of thin-walled concrete filled-steel tube column, a type of restraint namely spiral stiffener was proposed. Through the axial compression experiments of the six kinds of the concrete filled-steel tube composite columns, i.e., the common steel pipe, straight rib, built-in opening straight rib, inner spiral rib, spiral rib and external spiral rib-reinforced, the failure process, ultimate load, displacement and strain were compared and analyzed, and the failure mode and mechanism of the spiral stiffened thin-walled concrete-filled steel tube column were obtained. The results show that, the bearing capacity of the thin-walled concrete-filled steel tubular can be effectively improved by setting straight rib, opening straight rib and internal spiral rib. However, their constraint mechanisms were quite different. The vertical stiffener played a significant role in improving the bearing capacity, while the spiral rib played a major role by restraining the transverse deformation of the steel tube, and its contribution to the vertical stiffness was small. For the spiral rib external form, due to the lack of restrictions on the external concrete deformation, the cracking of spiral rib was serious and the spiral rib quitted service in advance. When the vertical steel bar was set, the steel bar and spiral rib formed "block" constraints on the concrete, which delayed the development of cracks, worked well with the core members, and improved the bearing capacity and deformation capacity. The spiral stiffener proposed in this paper can better solve the problem of poor deformation capacity of traditional thin-walled concrete filled steel tube. When the spiral rib was placed outside, the steel pipe can be protected by external concrete, avoiding fire prevention and anticorrosion treatment, thus reducing the maintenance cost in the later stage. The new composite members have good mechanical performance, and the research work can provide technical support for the engineering application. Copyright ©2021 Advanced Engineering Sciences. All rights reserved.
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页码：18 / 28
页数：10
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