混杂纤维混凝土烟道板牛腿耐火性能试验研究

许成祥; 王骞弘; 许奇琦; 姜学鹏

doi:10.20174/j.JUSE.2026.04.20

地下空间与工程学报 >

2026 , Vol. 22 >Issue 4: 1316 - 1325

DOI: https://doi.org/10.20174/j.JUSE.2026.04.20

理论与试验研究

混杂纤维混凝土烟道板牛腿耐火性能试验研究

许成祥 ,
王骞弘 ,
许奇琦 ,
姜学鹏

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1.武汉科技大学城市建设学院,武汉 430065;
2.城市更新湖北省工程研究中心,武汉 430065;
3.武汉科技大学资源与环境工程学院,武汉 430081

许成祥(1965—),男,安徽庐江人,博士,教授,主要从事防灾减灾等领域的教学与科研工作。E-mail:cx_xu@sina.com

收稿日期: 2025-10-07

网络出版日期: 2026-09-07

基金资助

国家自然科学基金面上项目(52178158);湖北省高等学校优秀中青年科技创新团队计划(T2022002)

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Experimental Research on Fire Performance of Hybrid Fiber Concrete Corbels for Flue Plate

Xu Chengxiang ,
Wang Qianhong ,
Xu Qiqi ,
Jiang Xuepeng

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1. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, P. R. China;
2. Hubei Engineering Research Center for Urban Renewal, Wuhan 430065, P. R. China;
3. School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, P. R. China

Received date: 2025-10-07

Online published: 2026-09-07

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摘要

为提升烟道板牛腿耐火安全性,设计并制作了6个烟道板牛腿试件,对试验组持恒载按照标准火灾升温曲线升温120 min,自然冷却后以未历经高温试件为对照进行静力加载破坏性试验,观察试件破坏过程并探讨钢纤维和PP 纤维的混杂效应。结果表明:钢—聚丙烯混杂纤维混凝土烟道板牛腿在延缓温度上升、提高抗爆裂性能等方面均优于素混凝土牛腿;两个小时升温作用,试件均未出现明显位移和整体垮塌;高温后试件加载,均没有受弯和受剪破坏的特征,内部植筋出现了黏结—滑移破坏;高温后双掺纤维试件、单掺纤维试件和素混凝土试件残余承载力分别为85.71%、79.08%和64.90%;高温后试件植筋黏结性能下降,荷载—位移曲线斜率比常温略大;斜截面应变满足拉压杆模型的应变特征。

关键词： 烟道板牛腿; 钢—聚丙烯混杂纤维; 高性能混凝土; 耐火性能; 后锚固植筋技术; 破坏形态

本文引用格式

许成祥 , 王骞弘 , 许奇琦 , 姜学鹏 . 混杂纤维混凝土烟道板牛腿耐火性能试验研究[J]. 地下空间与工程学报, 2026 , 22(4) : 1316 -1325 . DOI: 10.20174/j.JUSE.2026.04.20

Abstract

To improve the fire safety of corbels for flue plates, six corbels were designed and fabricated. For the test group, corbels under constant load were heated according to the standard fire temperature-rise curve for 120 minutes, followed by natural cooling. After that, static loading destructive tests were conducted with corbels not subjected to high temperatures as the control group. Failure processes of the corbels were observed. The hybrid effects of steel fibers and polypropylene fibers were explored. The results show that: The steel-polypropylene hybrid fiber concrete corbels for flue plates are superior to plain concrete corbels in terms of delaying the temperature rise, enhancing the anti-spalling performance, and other aspects. Under the effect of two-hour heating, the corbels did not show obvious displacement or overall collapse. After being heated and loaded, the corbels did not show the characteristics of flexural failure or shear failure, but their internal reinforcement bar plantings exhibited a bond-slip failure mode. Residual bearing capacities of the corbels with double-doped fiber,single-doped fiber, and plain concrete after high temperature were 85.71%,79.08% and 64.90%, respectively. After being exposed to high temperature, the bonding performance of the planted bars decreased, and the slopes of the load-displacement curves were all slightly larger than those under normal temperature conditions. The strain of the inclined section satisfied the strain characteristics of the strut-and-tie model.

Key words： corbel for flue plate; steel-polypropylene hybrid fiber; high-performance concrete; fire performance; technique of post-installed bonded rebars; failure mode

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