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

2026 , Vol. 54 >Issue 2: 123 - 132

DOI: https://doi.org/10.12141/j.issn.1000-565X.250138

Architecture & Civil Engineering

Enhancing Effect of Rectangular Spiral Stirrups on the Fire Resistance of Concrete-Filled Rectangular Steel Tubular Columns

  • QIU Peiyun ,
  • ZANG Jianbo ,
  • WANG Xinxiang
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  • 1.Guangzhou Metro Construction and Management Co. ，Ltd. ，Guangzhou 510335，Guangdong，China
    2.School of Civil Engineering and Transportation，South China University of Technology，Guangzhou 510640，Guangdong，China
    3.Fire Research Institute，Guangdong Provincial Academy of Building Research Group Co. ，Ltd. ，Guangzhou 510530，Guangdong，China

Received date: 2025-05-09

  Online published: 2025-06-04

Supported by

the National Natural Science Foundation of China(52408530);the China Postdoctoral Science Foundation(2023M730734)

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Abstract

Internal stirrup confinement can significantly enhance the fire resistance of concrete-filled steel tubular (CFST) columns. Even without any fire protection, this approach still enables the columns to meet the design requirements for the corresponding fire resistance rating, providing a novel method for structural fire protection design and enhancing the safe service life of structures. This paper designed and fabricated three full-scale rectangular CFST columns and conducted fire test on them under the combined effects of standard fire exposure and axial loading. The study investigated the fire performance enhancement of such members via internal rectangular spiral stirrups, and examined the influence of stirrup spacing on their fire resistance. Based on the existing mechanical constitutive models of materials at elevated temperature, this study developed a numerical model for rectangular CFST columns and revealed the mechanism by which the spiral stirrups constrain the core concrete to enhance the fire resistance. The research results indicate that, with equivalent or slightly lower total steel usage, the internal rectangular spiral stirrups can significantly improve the fire resistance of such columns, with an increase in fire resistance of up to 104.1%. By reasonably designing the stirrups parameters, this type of axially compressed column can meet the Class Ⅱ fire resistance rating requirements for 150 minutes without the need of a fire protection layer on the steel tube surface. When the stirrup spacing increases from 40 mm to 80 mm, its effect on the fire resistance of such members is relatively small. The established numerical model can effectively predict the fire resistance of rectangular CFST columns with internal rectangular spiral stirrups, but its accuracy in predicting deformation at different heating time is less satisfactory.

Key words： rectangular spiral stirrup; rectangular CFST column; fire resistance; stirrup spacing; confinement

Cite this article

QIU Peiyun , ZANG Jianbo , WANG Xinxiang . Enhancing Effect of Rectangular Spiral Stirrups on the Fire Resistance of Concrete-Filled Rectangular Steel Tubular Columns[J]. Journal of South China University of Technology(Natural Science), 2026 , 54(2) : 123 -132 . DOI: 10.12141/j.issn.1000-565X.250138

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