Fatigue analysis of a UHPFRC-OSD composite structure considering crack bridging and interfacial bond stiffness degradations
Fatigue analysis of a UHPFRC-OSD composite structure considering crack bridging and interfacial bond stiffness degradations
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DOI：
10.1016/j.engstruct.2021.113330
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发表时间：
2021-12
影响因子：
5.5
通讯作者：
Cheng-hao Ma;P. Deng;Takashi Matsumoto
中科院分区：
文献类型：
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作者：
Cheng-hao Ma;P. Deng;Takashi Matsumoto
本研究提出了一种在有限元模型中开发的数值方法，用于分析轮载作用下采用超高性能纤维混凝土（UHPFRC）罩面加固的正交异性钢桥面板（OSD）的静态和疲劳性能。在静力分析中，考虑了与组合桥面板真实的情况接近的因素，以达到计算精度和效率之间的平衡。采用静力分析中确定的模型，考虑开裂UHPFRC的桥接退化和UHPFRC/钢界面粘结刚度退化，对组合桥面板在移动轮载作用下进行疲劳分析。从实验行为的良好再现中，可以表明关于界面降解的假设场景是实验中发生的情况。因此，数值模型可以提供更深入的了解目前的实验方面的疲劳性能以及劣化机制。
This study presents a numerical method developed in a finite element model to analyze both the static and fatigue behaviors of the orthotropic steel deck (OSD) strengthened with an Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) overlay under the wheel-type load. In static analysis, the factors that approach the real conditions of composite deck are investigated to achieve a balance between calculation accuracy and efficiency. Employing the model identified in static analysis, fatigue analysis of composite deck under a moving wheel load is conducted considering the bridging degradation of cracked UHPFRC and the bond stiffness degradation at the UHPFRC/steel interface. From a good reproduction of the experimental behaviors, it may be indicated that the assumed scenarios regarding the interfacial degradation were what happened in the experiment. Consequently, the numerical model can provide a deeper understanding of the current experiment in terms of the fatigue performances as well as the deterioration mechanisms.