Development and application of a numerical model for fatigue performance assessment of UHPFRC-repaired RC bridge decks

1.对UHPFRC梁在不同加载速度、不同龄期下的四点静力抗弯试验以及不同应力水平下的疲劳抗弯试验数据进行了处理.对试验梁进行有限元分析，并对试验数据进行拟合，得到材料退化规律.利用无损检测技术，如显微镜和CT扫描，对测试样品进行研究，以揭示退化和失效机制.利用成果2得出的退化规律，分析了干、湿工况下UHPFRC加铺层加固钢桥面板的疲劳性能。

1. Process experimental data of UHPFRC beams obtained from 4-point static flexural tests under different load speeds and ages as well as fatigue flexural tests under different stress levels.2. Conduct FEA on the tested UHPFRC beams and fit the experimental data to obtain the material degradation law.3. Investigate the tested specimens using NDT techniques, such as microscope and CT scan to uncover the degradation and failure mechanisms.4. Analyze the fatigue performance of steel deck plate strengthened with UHPFRC overlay under dry and wet conditions using the degradation law obtained from Achievement 2.