钢-聚丙烯混杂纤维混凝土等幅受压疲劳变形
作者:
作者单位:

武汉大学 土木建筑工程学院, 湖北 武汉 430072

作者简介:

崔 凯(1991—),男,江苏盐城人,武汉大学博士生.E-mail: kaicui@whu.edu.cn

通讯作者:

徐礼华(1962—),女,安徽潜山人,武汉大学教授,博士生导师,博士.E-mail: xulihua@whu.edu.cn

中图分类号:

TU528.572

基金项目:

国家自然科学基金资助项目(51878519,51978538);湖北省重点研发计划项目(2020BAB060);湖北省自然科学基金资助项目(2020CFB639)


Fatigue Deformation of Steel-Polypropylene Hybrid Fiber Reinforced Concrete under Constant-Amplitude Cyclic Compression
Author:
Affiliation:

School of Civil Engineering, Wuhan University, Wuhan 430072, China

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    摘要:

    对钢-聚丙烯混杂纤维混凝土(HFRC)开展单轴等幅循环受压疲劳变形试验,以探究应力水平对HFRC疲劳破坏形态、疲劳应力-应变曲线、疲劳耗能能力以及极限疲劳变形的影响规律.结果表明:HFRC的疲劳破坏形态为剪切破坏,具有延性破坏特征;HFRC的疲劳累积耗能和极限疲劳变形随着应力水平的降低而增加;建立了考虑存活率的HFRC应力水平-极限疲劳变形方程,能够定量描述HFRC在任意疲劳荷载作用下的极限变形.

    Abstract:

    Steel-polypropylene hybrid fiber reinforced concrete(HFRC) were tested for uniaxial constant-amplitude cyclic compression to investigate their fatigue deformation behaviors, with an emphasis on the effects of the stress level on fatigue failure mode, fatigue stress-strain curve, fatigue cumulative energy dissipation and ultimate fatigue deformation of HFRC. The results show that the fatigue failure mode of HFRC presents a shear failure and has ductile characteristics. In addition, cumulative energy dissipation and ultimate fatigue failure of the HFRC specimen increase with a decrease in stress level. Finally, a stress level- ultimate fatigue deformation equation is proposed to quantitively describe the ultimate deformation of concrete under an arbitrary fatigue loading.

    表 1 混凝土的配合比Table 1 Mix proportion of concrete
    表 4 HFRC极限疲劳变形的威布尔分布参数Table 4 Weibull distribution parameters of ultimate fatigue deformation of HFRC
    表 2 钢纤维与聚丙烯纤维的主要物理参数Table 2 Main physical parameters of steel fiber and polypropylene fiber
    表 3 HFRC在不同应力水平下的极限疲劳变形Table 3 Ultimate fatigue deformations of HFRC under various stress levels
    图1 混杂纤维多尺度桥接效应示意图Fig.1 Schematic diagram of hybrid fiber bridging effect
    图2 HFRC的破坏形态Fig.2 Failure modes of HFRC
    图3 HFRC破坏断面中纤维的SEM图像Fig.3 SEM images of fibers in the broken sections of HFRC
    图4 典型的HFRC疲劳应力-应变曲线Fig.4 Typical fatigue stress-strain curves of HFRC
    图5 HFRC在不同应力水平下的能量耗散比Fig.5 Energy dissipation ratios of HFRC under various stress levels
    图6 HFRC疲劳变形随循环比的变化过程Fig.6 Fatigue deformation evolution curves of HFRC with ratios of load cycles
    图7 HFRC在不同应力水平下的极限疲劳变形Fig.7 Ultimate fatigue deformations of HFRC under various stress levels
    图8 钢纤维拔出行为示意图Fig.8 Schematic diagram of pull-out behavior of steel fibers embedded in concrete[19]
    图9 威布尔分布的概率密度函数Fig.9 Weibull probability distribution
    图10 ln Δ和ln [ln (1/P)]的拟合直线Fig.10 Fitting lines of ln Δ and ln [ln (1/P)]
    图11 极限疲劳变形和应力水平之间的关系Fig.11 Relationship between ultimate fatigue deformation and stress level
    图12 模型解析结果和本文试验数据的对比Fig.12 Comparisons between model predictions and test results
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引用本文

崔凯,徐礼华,池寅.钢-聚丙烯混杂纤维混凝土等幅受压疲劳变形[J].建筑材料学报,2023,26(7):755-761

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  • 收稿日期:2022-09-02
  • 最后修改日期:2022-10-14
  • 在线发布日期: 2023-09-15
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