华南理工大学学报(自然科学版) ›› 2026, Vol. 54 ›› Issue (2): 123-132.doi: 10.12141/j.issn.1000-565X.250138

• 土木建筑工程 • 上一篇    下一篇

矩形螺旋箍筋对矩形钢管混凝土柱抗火性能的提升作用

仇培云1(), 臧建波2,3(), 王新祥3   

  1. 1.广州地铁建设管理有限公司,广东 广州 510335
    2.华南理工大学 土木与交通学院,广东 广州 510640
    3.广东省建筑科学研究院集团股份有限公司 建筑消防研究所,广东 广州 510530
  • 收稿日期:2025-05-09 出版日期:2026-02-25 发布日期:2025-06-05
  • 通信作者: 臧建波 E-mail:qiupeiyun@gzmtr.com;jianbo_zang@163.com
  • 作者简介:仇培云(1980—),男,博士,正高级工程师,主要从事安全技术研究。E-mail: qiupeiyun@gzmtr.com
  • 基金资助:
    国家自然科学基金项目(52408530);中国博士后科学基金项目(2023M730734)

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

QIU Peiyun1(), ZANG Jianbo2,3(), WANG Xinxiang3   

  1. 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:2025-05-09 Online:2026-02-25 Published:2025-06-05
  • Contact: ZANG Jianbo E-mail:qiupeiyun@gzmtr.com;jianbo_zang@163.com
  • Supported by:
    the National Natural Science Foundation of China(52408530);the China Postdoctoral Science Foundation(2023M730734)

摘要:

内置箍筋约束能显著提升钢管混凝土(CFST)柱的抗火性能,且在无任何防火保护的情况下,仍可使构件满足对应耐火等级的设计要求,为结构防火设计和延长结构安全服役寿命提供了新途径。该文设计制作了3根足尺矩形CFST柱,对其进行标准火灾与荷载耦合作用下的明火试验,探究内置矩形螺旋箍筋对该类构件抗火性能的提升效果,并考察箍筋间距对其抗火性能的影响规律。基于材料现有的高温力学本构关系,建立了火灾作用下矩形螺旋箍筋约束矩形CFST柱的数值分析模型,揭示高温环境下箍筋约束核心混凝土对该类构件耐火极限的提升机理。研究结果表明:在总用钢量相同甚至略低的情况下,内置矩形螺旋箍筋可显著改善矩形CFST柱的耐火性能,耐火极限提升幅度高达104.1%;通过合理设计箍筋参数,该类轴压柱无需在钢管表面设置防火保护层,即可满足150 min的二级耐火等级要求;箍筋间距从40 mm增至80 mm时,对该类构件耐火性能的影响较小;所建数值模型可较好地预测内置矩形螺旋箍筋约束矩形CFST柱的耐火极限,但对构件不同受火时间下的变形预测精度欠佳。

关键词: 矩形螺旋箍筋, 矩形CFST柱, 耐火性能, 箍筋间距, 约束

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

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