Fatigue behaviour of shear connectors for steel-precast composite bridge girders

作为1950年代至1970年代大规模建设的结果，加拿大正在进入一个前所未有的基础设施维护和更换义务时期。维护和更换桥梁尤其具有挑战性，因为它们是交通的天然瓶颈。失去机会成本、延迟交货、浪费燃料、增加空气污染和增加碰撞频率，都是车道封闭导致的交通拥堵的直接后果。正是由于这些原因，加速桥梁建设(ABC)的好处正在得到实现，应该进一步发挥杠杆作用。为此，由预制混凝土桥面板和钢梁连接组成的组合模块化桥梁体系正变得越来越受欢迎。这些系统在公路桥梁、救灾结构、绕行桥梁和工作平台中都有应用。这些系统所采用的剪力连接会对桥梁的施工时间、环境成本、结构完整性和耐久性产生重大影响。考虑到这一点，需要进行研究，以更好地了解并找到改善这些联系行为的方法。

As a consequence of mass construction between the 1950s and 1970s, Canada is entering into a period of unprecedented infrastructure maintenance and replacement obligations. Maintaining and replacing bridges is especially challenging because they are natural bottlenecks for traffic. Lost opportunity costs, late deliveries, wasted fuel, increased air pollution, and increased collision frequency are all direct consequences of traffic congestion due to closed lanes. It is for these reasons that the benefits of Accelerated Bridge Construction (ABC) are being realized and should be further leveraged. Towards this end, composite modular bridge systems consisting of precast concrete deck panels connected to steel girders are becoming increasingly popular. These systems have applications in highway bridges, disaster relief structures, detour bridges, and work platforms. The shear connections employed for these systems can significantly impact construction time, environmental cost, structural integrity, and durability of the bridge. With this in mind, research is needed to better understand and find ways to improve the behaviour of these connections.