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地铁设计规范对采用整体道床的区间简支梁结构墩顶纵向水平位移值做了规定,该限值是参考《京沪高速铁路线桥隧站设计暂行规定》中有关条目确定的,经过近几年铁路部门研究,取值偏于保守。而且规范没有对连续梁结构的墩顶纵向水平位移值作规定,实际设计中对轨道桥梁的适用性较差。如果按此限值设计,轨道桥梁墩柱体量较普通市政桥梁下部墩柱体量增加很多,严重影响桥梁景观,工程造价提高15%左右。因此,根据城市轨道交通的特点制定合理墩台纵向刚度限值标准以提高轨道交通建设设计质量,减少不必要的工程投资是一项十分重要的工作。本文介绍了城市轨道高架桥墩纵向刚度设计限值依据和存在的问题。从高速铁路与城市轨道交通两者之间列车设计荷载的差别,分析了城市轨道交通高架线路桥墩纵向刚度放松设计限值的可行性。并根据最近的设计工作和科研单位的研究成果,推荐了梁轨相互作用下的计算有限元力学模型。
The Subway Design Code stipulates the longitudinal horizontal displacement value of pier top of the section simply supported beam with integral ballast bed. The limit value is determined by reference to the relevant items in “Provisional Regulations for Design of Beijing-Shanghai High Speed Railway Line Bridge Tunnel Station” In the railway sector research, the value of partial conservative. Moreover, the norms do not stipulate the longitudinal horizontal displacement value of the pier top of the continuous beam structure, but the applicability to the rail bridge in actual design is poor. If designed according to this limit, the mass of rail piers and pillars will increase greatly compared with that of ordinary municipal bridges, seriously affecting the bridge landscape and the cost of the project will increase by about 15%. Therefore, according to the characteristics of urban rail transit to develop a reasonable pier longitudinal stiffness limit standards to improve the quality of rail transit construction design, reduce unnecessary investment in the project is a very important task. This paper introduces the design limits and existing problems of longitudinal stiffness of urban rail viaduct pier. Based on the difference of train design loads between high-speed railway and urban rail transit, the feasibility of relaxing the design limits of longitudinal stiffness of bridge piers in urban rail transit is analyzed. According to the recent design work and research results of research institutes, the calculation of finite element mechanical model under beam-rail interaction is recommended.