| 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. |
| 关键词: 钢-聚丙烯混杂纤维 等幅循环受压 疲劳变形 应力水平-极限疲劳变形方程 |
| DOI：10.3969/j.issn.1007-9629.2023.07.008 |
| 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） |
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| Fatigue Deformation of Steel-Polypropylene Hybrid Fiber Reinforced Concrete under Constant-Amplitude Cyclic Compression |
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CUI Kai, XU Lihua, CHI Yin
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School of Civil Engineering， Wuhan University， Wuhan 430072， China
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| 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. |
| Key words: steel-polypropylene hybrid fiber constant-amplitude cyclic compression fatigue deformation stress level-ultimate fatigue deformation equation |
