城市轨道交通低置桥梁结构方案研究

以上海市某轨道交通线路设计为实例,提出地面线采用低置桥梁结构的必要性,对于低置桥梁在使用场景、结构形式、力学性能、运营维护等方面的特殊性进行分析,重点计算研究不同结构形式下的低置桥梁下部结构刚度对于全桥力学性能的影响。研究结果表明,低置桥梁的上、下部结构连接形式、桥梁跨径、下部结构刚度是决定全桥结构安全性和影响桥梁适用性的重要因素;与常规桥梁相比,轨道交通低置桥梁在进行结构方案比选和设计时需特别注意对线路条件、场地特点的适应性。

Research on structural form of low-rise bridges of urban rail transit

Taking the design of a rail transit ground line in Shanghai as an example,the necessity of application of low-rise bridges is determined and their special characteristics in application,structure,mechanical property,and maintenance of low-rise bridges are analyzed.The main part of computations and research focuses on the influence of the rigidity of the substructure over the mechanical property of the whole low-rise bridges with various structures.It is determined by the research that all the connection of superstructure and substructure,the span of bridge and the rigidity of the substructure play an important role in conclusion of the safety and applicability of low-rise bridges.The comparison and design of low-rise bridges of rail transit must focus more on fitting the special features of route and field than bridges of normal height.