Experimental study on compression performance of ultra-high- strength concrete (UHSC) filled high-strength steel tube stub columns subjected to eccentric load

被引：0

作者：

Luo X. ^{[1
,2
]}

Wei J. ^{[1
,2
]}

Han J. ^{[2
]}

Chen B. ^{[2
]}

机构：

[1] College of Civil Engineering, Fujian University of Technology, Fuzhou

[2] College of Civil Engineering, Fuzhou University, Fuzhou

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2021年 / 42卷

关键词：

Bearing capacity; Concrete-filled steel tube stub column; Eccentric compression test; High-strength steel; Ultra-high-strength concrete (UHSC);

D O I：

10.14006/j.jzjgxb.2021.S2.0032

中图分类号：

学科分类号：

摘要：

In order to study the compresion-bending performance of ultra-high-strength concrete-filled high-strength steel tube short columns, ten spcimens subjected to different eccentric loads were carried out. The failure modes, load-deflection curves, and load-strain curves of the short columns were investigated. The results show that with the increase of eccentricity, the compressive failure characteristics associated with bending deformation tend to be less obvious, the bearing capacity decreases, the plasticity level at the edge of the tension and compression zone increases, and the ductility is improved more significantly. Before the ultra-high-strength concrete-filled high-strength steel tube short column reaches the eccentric bearing capacity, the composite section satisfies the plane section assumption. When the eccentricity is less than 1.6, small eccentric failure occurs in ultra-high-strength concrete-filled high-strength steel tube. With the development of section plasticity, the hoop effect of high-strength steel tube on UHSC at the edge of the compression zone is brought into play. By comparing the bearing capacity obtained from the test and the predicted values of GB 50936-2014 'Technical code for concrete steel tubular structures', it is found that the reduction coefficient considering the influence of eccentricity on bearing capacity is not applicable to ultra-high-strength concrete-filled high-strength steel tube short column occurred in small eccentric failure. Therefore, a modified calculation method of reduction coefficient was proposed based on the test results. © 2021, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：271 / 277

页数：6

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