大挑臂连续宽箱梁桥面板简化设计方法研究

On Simplified Design Method to Long Cantilever Continuous Wide Box Girder Bridge Deck Slab

结合上海市嘉闵高架工程,针对大挑臂连续宽箱梁桥面板设计总结出一套简化设计方法。通过将常规桥面板设计方法边界条件中各腹板中心线位置处的支座在竖向上的约束由原来的刚性约束优化为弹性约束,从而既较为准确地模拟大挑臂连续宽箱梁在荷载作用下的横向受力效应,满足设计要求;又可以大大简化计算过程,提高设计效率。

Combined with Jiamin Viaduct project in Shanghai,a set of simplified design methods are summarized on long cantilever continuous wide box girder bridge deck slab in this paper.The vertical restraint of abutment(located in the centre line of every web under boundary conditions of regular bridge deck slab design method) is optimized from inflexible to elastic;therefore,it can simulate the horizontal force effect of the long cantilever continuous wide box girder under load with meeting the requirement of the design.The method,moreover,can simplify the calculation process and improve the design efficiency greatly.