采用冷连接的钢-UHPFRC组合桥面板受力性能与设计方法

为了解决钢桥面板疲劳开裂与铺装层耐久性不足的工程难题，合理延长钢桥面板疲劳使用寿命，本项目采用自主研发的新型波折板剪力件，将超高性能纤维混凝土(UHPFRC)与钢盖板进行冷连接组合设计，形成钢-UHPFRC组合桥面板，从而提高钢桥面板局部刚度、降低钢桥面板细节疲劳应力、减少制造过程引入的焊接疲劳细节、改善钢桥铺装层工作条件。通过静力及疲劳试验、数值断裂力学模拟、理论分析和工程应用相结合的研究方法，开展钢-UHPFRC组合桥面板静力与疲劳性能研究，基于非接触式数字图像技术进行冷连接组合界面受力全过程监测，探究冷连接组合界面的短期、长期受力性能及退化机理，研究波折板剪力连接件传力机制，提出钢-UHPFRC组合桥面板静力与疲劳性能评价指标，构建钢-UHPFRC组合桥面板设计准则。本项目研究成果可为钢桥面板的长寿命设计与建造提供技术支撑，对修编有关规范也可提供参考。

To solve typical engineering problems of steel bridge deck fatigue cracking and durability problem of pavement above, to rationally extend service life of steel bridge deck, UHPFRC is proposed to be composited with top plate of steel bridge deck by self-developed cold connecting corrugated plate shear connector to form steel and UHPFRC composited bridge deck. Thus, it can be achieved enhancing local stiffness, reducing fatigue stress of steel bridge deck, decreasing welding fatigue detail in fabrication and improving pavement work conditions. Static and fatigue test study, numerical fracture mechanics finite element analysis, theoretical analysis and engineering application are used for static and fatigue behavior study of steel and UHPFRC composited bridge deck. Non-contact digital image technology will be used for monitoring full-process of cold composite interface, and the short-term and long-term performance and degeneration mechanism of cold composite interface will be studied. The load transferring mechanism of corrugated steel plate shear connector are studied. The static and fatigue performance assessment index will be proposed, and the design rules will be built for steel – UHPFRC composite bridge deck. Study in this project provides technical support for long life steel bridge deck design and construction, and also provides reference for revision of relative specifications.