大纵肋正交异性组合桥面板疲劳性能研究

发布时间：2018-08-07 20:47

【摘要】：在大纵肋正交异性钢桥面板结构中引入混凝土结构层,通过栓钉将钢桥面板与混凝土结构层组成新型大纵肋正交异性组合桥面板,是从结构体系层面提高大纵肋正交异性钢桥面板疲劳性能的有效途径。基于有限元数值分析,明确了大纵肋正交异性组合桥面体系对于钢桥面板典型疲劳易损细节的应力幅改善效果;采用足尺节段模型试验对结构的关键疲劳易损细节进行了疲劳试验研究,验证了关键疲劳易损细节在设计寿命期内的抗疲劳安全性和混凝土结构层在疲劳荷载作用下的耐久性,在此基础上对关键疲劳易损细节的疲劳损伤演化及结构体系的疲劳破坏模式进行了试验与理论研究。研究结果表明:大纵肋正交异性组合桥面板结构体系能够显著降低U肋与顶板以及U肋与横隔板连接细节的应力幅,横隔板开孔部位是控制钢桥面板疲劳性能的关键构造细节;设计寿命期内钢桥面板疲劳性能与混凝土结构层的疲劳耐久性均满足要求,且具有一定的安全储备;混凝土结构层负弯矩区疲劳开裂对钢桥面板各疲劳易损细节疲劳性能的影响不显著;大纵肋正交异性组合桥面板的疲劳破坏模式表现出典型的两阶段特征,栓钉发生疲劳断裂并导致组合效应局部劣化,进而加速钢桥面板关键疲劳易损细节的疲劳损伤累积速度并最终发生疲劳开裂。
[Abstract]:The concrete structure layer is introduced into the slab structure of the large longitudinal rib orthotropic steel bridge. The steel deck slab and the concrete structure layer are composed of a new type of orthotropic composite deck slab with large longitudinal rib. It is an effective way to improve the fatigue performance of orthotropic steel bridge slab with large longitudinal ribs from the structural system level. Based on the finite element numerical analysis, the stress amplitude improvement effect of orthotropic composite deck system with large longitudinal ribs on the typical fatigue vulnerability details of steel bridge panels is determined. The fatigue test of key fatigue vulnerability details of structure is carried out by full-scale segment model test. The fatigue safety of key fatigue vulnerability details during the design life period and the durability of concrete structure under fatigue load are verified. On this basis, the fatigue damage evolution of the key fatigue vulnerability details and the fatigue failure mode of the structural system are studied experimentally and theoretically. The results show that the large longitudinal rib orthotropic composite deck structure system can significantly reduce the stress amplitude of U rib and roof and the connecting details of U rib and transverse partition. The opening position of transverse partition is the key structural detail to control the fatigue performance of steel bridge panel. The fatigue performance of steel bridge slab and the fatigue durability of concrete structure layer meet the requirements of design life and have certain safety reserve. The fatigue cracking in the negative moment region of concrete structure has no significant effect on the fatigue performance of steel bridge slabs, and the fatigue failure mode of large longitudinal rib orthotropic composite deck slab shows typical two-stage characteristics. The fatigue fracture of the bolt leads to the local deterioration of the combined effect, which accelerates the fatigue damage accumulation rate of the key fatigue vulnerability details of the steel bridge panel and finally the fatigue cracking.
【作者单位】： 西南交通大学土木工程学院;
【基金】：国家自然科学基金项目(51578455,51178394,51378431) “十二五”国家科技支撑计划项目(2011BAG07B03) 中央高校基本科研业务费专项资金项目(2682014CX078)
【分类号】：U441.4

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