港珠澳大桥正交异性钢桥面板疲劳特性研究
发布时间：2018-11-28 17:29
【摘要】：由结构体系和受力特性共同决定,疲劳问题是正交异性钢桥面板应用和发展所面临的重要课题。以典型的正交异性桥面板钢箱梁桥——港珠澳大桥为研究对象,通过足尺试件模型对5类重要的正交异性钢桥面板疲劳易损部位进行试验和理论研究。选取最易发生疲劳损伤的梁段作为模型设计的依据,针对各关键疲劳易损部位设计4组共8个足尺疲劳试件模型;对设计寿命期内各疲劳易损部位的疲劳特性进行试验验证,在此基础上选取典型疲劳易损部位进行疲劳损伤及疲劳性能试验,建立基于理论模型和弹塑性断裂力学的疲劳损伤裂纹扩展模拟方法。研究结果表明:港珠澳大桥正交异性钢桥面板的疲劳性能满足设计要求;正交异性钢桥面板疲劳易损部位的疲劳性能存在较大差异;疲劳裂纹附近区域的应力分布随裂纹的扩展而不断发生改变,可据此判别裂纹的萌生并监测其扩展;所提出的方法适用于待研究疲劳易损部位的疲劳寿命评估。
[Abstract]:Fatigue problem is an important subject for the application and development of orthotropic steel bridge panel. Taking the typical orthotropic deck steel box girder bridge, Hongkong-Zhuhai-Macao Bridge, as the research object, five important orthotropic steel bridge slabs are tested and theoretically studied by full-scale specimen model. Four groups of 8 full-scale fatigue specimen models were designed according to the key fatigue vulnerable parts of the beam segment which is the most vulnerable to fatigue damage as the basis of the model design. The fatigue characteristics of various fatigue vulnerable parts during the design life are tested and verified. On this basis, the fatigue damage and fatigue performance tests of typical fatigue vulnerable parts are carried out. A simulation method of fatigue damage crack propagation based on theoretical model and elastoplastic fracture mechanics is established. The results show that the fatigue performance of orthotropic steel bridge slab of Hongkong-Zhuhai-Macao Bridge can meet the design requirements, and the fatigue performance of orthotropic steel bridge face slab is different from that of orthotropic steel bridge slab. The stress distribution in the region near the fatigue crack changes with the crack propagation, which can be used to judge the crack initiation and monitor its propagation. The proposed method is suitable for the fatigue life evaluation of the fatigue vulnerable site under study.
【作者单位】： 西南交通大学;
【基金】：国家科技支撑计划(2011BAG07B03) 国家自然科学基金(51178394) 中央高校基本科研业务费专项资金(2682014CX078)
【分类号】：U448.36;U441.4
[Abstract]:Fatigue problem is an important subject for the application and development of orthotropic steel bridge panel. Taking the typical orthotropic deck steel box girder bridge, Hongkong-Zhuhai-Macao Bridge, as the research object, five important orthotropic steel bridge slabs are tested and theoretically studied by full-scale specimen model. Four groups of 8 full-scale fatigue specimen models were designed according to the key fatigue vulnerable parts of the beam segment which is the most vulnerable to fatigue damage as the basis of the model design. The fatigue characteristics of various fatigue vulnerable parts during the design life are tested and verified. On this basis, the fatigue damage and fatigue performance tests of typical fatigue vulnerable parts are carried out. A simulation method of fatigue damage crack propagation based on theoretical model and elastoplastic fracture mechanics is established. The results show that the fatigue performance of orthotropic steel bridge slab of Hongkong-Zhuhai-Macao Bridge can meet the design requirements, and the fatigue performance of orthotropic steel bridge face slab is different from that of orthotropic steel bridge slab. The stress distribution in the region near the fatigue crack changes with the crack propagation, which can be used to judge the crack initiation and monitor its propagation. The proposed method is suitable for the fatigue life evaluation of the fatigue vulnerable site under study.
【作者单位】： 西南交通大学;
【基金】：国家科技支撑计划(2011BAG07B03) 国家自然科学基金(51178394) 中央高校基本科研业务费专项资金(2682014CX078)
【分类号】：U448.36;U441.4
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