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在车辆荷载作用下,正交异性钢桥面板的疲劳开裂对结构的疲劳性能以及使用安全性能具有较大的影响,钢桥面板中复杂的焊接连接细节成为裂纹出现的集中区域。依据在正交异性钢桥面板方面研究相对成熟的AASHTO、Eurocode和日本规范,结合我国公路钢结构桥梁设计规范(送审稿);通过数值分析得到疲劳敏感细节在各国标准疲劳车辆荷载下的应力响应,并按照规范对细节的疲劳强度进行验算。验算结果表明,疲劳细节的应力幅对轴重比较敏感;顶板与U肋细节的纵向影响线比横隔板与U肋焊接处的影响线短;顶板与U肋处细节和横隔板挖孔处细节更容易发生疲劳裂纹。
Under the action of vehicle load, the fatigue cracking of orthotropic steel bridge deck has a great influence on the fatigue performance and safety performance of the structure, and the complicated welding connection details in the steel bridge deck become the focus area of the crack. Based on the research on the relatively mature AASHTO, Eurocode and Japanese norms in the orthotropic steel bridge deck, combined with the design specifications (draft for review) of the bridge design for the highway steel structure in our country, the stress of the fatigue-sensitive details under the standard fatigue vehicle loads is obtained by numerical analysis Response, and in accordance with the specifications of the details of fatigue strength checking. The calculated results show that the stress amplitude of the fatigue details is sensitive to the axial load. The influence of the longitudinal influence of roof and U-rib details is shorter than the influence of the welding of the diaphragm and the U-rib. The details of roof and U- Department details are more prone to fatigue cracks.