高温后钢-PVA混杂纤维高性能混凝土与变形钢筋黏结性能试验
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

TU375.572

基金项目:

湖北省高等学校优秀中青年科技创新团队计划项目(T2022002)


Experimental Research on the Bond Behavior between Steel-PVA Hybrid Fiber High Performance Concrete and Deformed Bars after Elevated Temperature
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    为研究高温后钢-聚乙烯醇(Polyvinyl Alcohols,PVA)混杂纤维高性能混凝土(Hybrid Fiber High Performance Concrete,HFHPC)与变形钢筋的黏结性能退化规律,以200℃、400℃、600℃、800℃为目标温度,选取钢纤维体积率、PVA纤维体积率、矿粉掺量为正交试验因素设计并制作了25组HFHPC试件,完成了单调荷载下的中心拉拔试验。结果表明:高温后各组HFHPC试件黏结破坏形态均表现为钢筋拔出破坏;试验温度范围内,对HFHPC试件黏结强度的影响程度均为:钢纤维体积率最大、矿粉掺量次之、PVA纤维体积率最小;随着温度的升高,HFHPC试件黏结强度逐渐下降,且在相同温度条件下,HFHPC试件黏结强度和峰值滑移相比于未掺纤维的混凝土试件均有所提升,其中,200℃时HFHPC试件的黏结强度提升最为显著,分别提升了33.69%、35.76%、37.54%和46.03%;混杂纤维能显著提高高温后高性能混凝土与钢筋的峰值界面能,明显改善黏结延性和耗能能力;提出的考虑温度作用后的混杂纤维混凝土与钢筋黏结-滑移模型与试验实测结果吻合较好,可为火灾后混杂纤维高性能混凝土结构损伤评估及加固方案提供参考。

    Abstract:

    In order to research the effects of elevated temperatures on bond behavior between steel-Polyvinyl Alcohols (PVA) hybrid fiber high performance (HFHPC) concrete and deformed reinforcement. With 200℃, 400℃, 600℃ and 800℃ as the target temperatures,25 sets of HFHPC specimens were designed by selecting volume fraction of steel fiber and PVA fiber and dosing of mineral powder as the orthogonal test factors. The central pull-out test under monotonic loading was completed. Results of orthogonal experiment showed that the bonding failure modes of all groups of HFHPC specimens after high temperature were rebar pullout damage. Within the test temperature range, the volume fraction of steel fiber played the most important role in bond strength, followed by mineral powder dosage, whereas the PVA fiber volume fraction had the minimum effect. With the increase of temperature, the bond strength of HFHPC specimens gradually decreased. Compared to the concrete specimens without fibers doping, the bond strength and peak slip of HFHPC specimens were increased under the same temperature conditions. The bond strength of HFHPC specimens was most significantly increased at 200°C, which was increased by 33.69%, 35.76%, 37.54%, and 46.03%, respectively. The hybrid fibers significantly improve the peak interfacial energy between high performance concrete and steel reinforcement after high temperatures, significantly improve the bond ductility and energy dissipation capacity. The proposed bond-slip curves of hybrid fiber concrete and deformed reinforcement after considering the temperature effect are in good fit with the experimental measured results, which can provide a reference for the structural damage assessment of hybrid-fiber high-performance concrete and the reinforcement scheme after fire.

    参考文献
    相似文献
    引证文献
引用本文

许成祥,吕红杰,许奇琦,等. 高温后钢-PVA混杂纤维高性能混凝土与变形钢筋黏结性能试验[J]. 科学技术与工程, 2024, 24(20): 8615-8623.
Xu Chengxiang, Lü Hongjie, Xu Qiqi, et al. Experimental Research on the Bond Behavior between Steel-PVA Hybrid Fiber High Performance Concrete and Deformed Bars after Elevated Temperature[J]. Science Technology and Engineering,2024,24(20):8615-8623.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2023-08-13
  • 最后修改日期:2024-07-16
  • 录用日期:2023-12-02
  • 在线发布日期: 2024-07-26
  • 出版日期:
×
喜报!《科学技术与工程》入选国际著名数据库《工程索引》(EI Compendex)!