摘要
由结构体系和受力特性共同决定,大纵肋正交异性钢桥面板纵肋与顶板焊缝以及纵肋与横隔板焊缝疲劳问题突出,是结构疲劳性能的控制部位。引入组合结构桥面板理念,通过在其顶板上铺设混凝土结构层组成新型组合桥面板,探索改善上述控制部位疲劳性能的新途径及其可行性,并通过与传统正交异性钢桥面板和薄层RPC组合桥面板两类关键疲劳易损部位的对比研究,验证其抗疲劳性能的优越性。研究结果表明,所提出的新型大纵肋正交异性钢—混凝土组合桥面板通过将混凝土结构层与正交异性钢桥面板组成协同受力体系,能够有效增强桥面板的整体受力性能和关键疲劳易损部位的疲劳性能,其典型疲劳易损部位的应力幅显著小于传统的正交异性钢桥面板,其疲劳性能优于传统的正交异性钢桥面板,是具有较好推广应用前景的新型桥面板结构形式。
Determined by its structural system and corresponding mechanical properties, rib--to-deck and rib-to-diaphragm welded joints of large longitudinal rib orthotropic steel bridge deck have serve fatigue issues, which become primary control position of structural fatigue properties. Therefore the concept of steel-concrete composite bridge deck is induced by putting a cement-based overlay on the deck to form a composite deck system to investigate the new path and feasibility of improving above fatigue details fatigue properties. Moreover research and comparison of 2 predominant types of vulnerable fatigue detail with traditional orthotropic bridge deck and composite deck system composed of orthotropic steel deck and ultrathin RPC layer is made to verify its superiority of fatigue resistance. The results indicate that the proposed new large longitudinal rib orthotropic steel-concrete composite deck which formed a cooperative mechanical system could significantly improve the whole mechanical properties and fatigue performance of predominant types of vulnerable fatigue detail, and its spectrum of each typical vulnerable fatigue detail is obviously less than those of traditional orthotropic bridge deck under the same vehicle load. In addition its fatigue performance is superior to traditional orthotropic bridge deck and proves to be a new deck structural form which possesses the broad prospect in promotion and application.
出处
《公路》
北大核心
2015年第12期71-77,共7页
Highway
基金
国家科技支撑计划
项目编号2011BAG07B03
国家自然科学基金
项目编号51178394
中央高校基本科研业务费专项资金
项目编号2682014CX078
关键词
钢一混凝土
组合结构
组合桥面
正交异性
钢桥面板
疲劳性能
steel-concrete composite structure
composite bridge deck
orthotropic steel bridge deck
fatigue properties
