Journal of South China University of Technology(Natural Science) >

2022 , Vol. 50 >Issue 7: 1 - 12

DOI: https://doi.org/10.12141/j.issn.1000-565X.210463

Architecture & Civil Engineering

Axial Compression Behavior of High-Strength Circular Steel Tube Confined High-Strength Steel Reinforced Concrete Short Columns

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  • 1.School of Civil Engineering and Transportation，South China University of Technology，Guangzhou 510640，Guangdong，China
    2.State Key Laboratory of Subtropical Building Science，South China University of Technology，Guangzhou 510640，Guangdong，China
康澜（1980-），女，博士，副教授，主要从事钢结构和组合结构研究。

Received date: 2021-07-21

  Online published: 2021-11-22

Supported by

National Natural Science Foundation of China(52178286);the Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology(2021B1212040003)

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Abstract

This paper carried out axial compression tests on nine circular steel tube confined steel reinforced (CSTCSR) concrete short columns, one circular steel tube confined (CSTC) concrete short column and one circular steel tube column filled with steel-reinforced concrete. The main purpose of this research is to study the influences of yield strength of steel tube and shape steel, diameter-thickness ratio of steel tube, concrete strength, inner surface treatment method of high-strength steel tube and restraint mode on the failure mode, strain response, axial compression bearing capacity and ductility of CSTCSR concrete short column. The results show that the failure mode of high-strength circular steel tube confined high-strength steel reinforced (HCSTCHSR) concrete short column is overall shear failure, and there is no obvious local buckling on the surface of high-strength steel tube, and the development of oblique cracks of concrete is effectively restricted by the embedded high-strength shape steel. For CSTCSR concrete short column, the axial compression bearing capacity ratio and ductility coefficient of this column with high-strength steel tube and high-strength shape steel are increased from 1.37 to 1.49 and from 2.22 to 3.25, respectively, compared with those of CSTCSR concrete short column using ordinary-strength steel tube and ordinary-strength shape steel. It is concluded that the HCSTCHSR concrete short column has more excellent axial bearing capacity and ductility, and high-strength steel using in such column can be fully utilized. On the basis of “technical standard for steel tube confined concrete structures” (JGJ/T471—2019) and the results of parametric analysis in this study, a modified formula for axial bearing capacity of HCSTCHSR concrete short column was proposed by using the existing confined concrete’s constitutive model to provide scientific basis and data support for practical engineering application.

Key words： high-strength steel tube; high-strength shape steel; axial compressive performance; axial bearing capacity

Cite this article

KANG Lan, CHEN Zonglin, LIN Yiwei . Axial Compression Behavior of High-Strength Circular Steel Tube Confined High-Strength Steel Reinforced Concrete Short Columns[J]. Journal of South China University of Technology(Natural Science), 2022 , 50(7) : 1 -12 . DOI: 10.12141/j.issn.1000-565X.210463

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