论文部分内容阅读
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。
The structure layer is introduced into the structure of the large longitudinal rib orthotropic steel bridge deck. The steel bridge deck and the concrete structural layer form a new type of large longitudinal rib orthotropic composite bridge deck through the peg, An Effective Way to Solve the Fatigue Property of the Cross - Deformed Steel Bridge Deck. Based on the finite element numerical analysis, the effect of the large longitudinal rib orthotropic bridge deck system on the stress amplitude improvement of the typical fatigue and damage details of the steel bridge deck was clarified. The full-scale section model test was used to analyze the details of the key fatigue and damage structure of the structure. Fatigue tests and studies have verified the anti-fatigue safety of the key fatigue details during the design life and the durability of the concrete structure under the fatigue load. Based on this, the fatigue damage evolution and structure of the key fatigue details System fatigue failure mode of experimental and theoretical research. The results show that the structural system with large longitudinal ribs and the combination of orthotropic bridge deck structures can significantly reduce the stress amplitude of the connection details between the U-rib and the roof and between the U-rib and the diaphragm. The opening of the diaphragm is the key to control the fatigue performance of the steel bridge deck The fatigue life of the steel bridge deck and the fatigue durability of the concrete structure meet the requirements during the design life and have some safety reserves; fatigue cracking of the negative moment area of the concrete structure fatigue on the steel bridge deck fatigue The fatigue failure mode of the large longitudinal rib orthotropic bridge deck exhibits typical two-stage characteristics, the fatigue fracture of the studs leads to the local deterioration of the combination effect, which accelerates the details of the key fatigue and damage of the steel bridge deck Fatigue damage accumulates and eventually fatigue cracks occur.