轨道交通高架桥下部结构水平变形计算及控制探讨

城市轨道交通高架桥梁设计中,由于多采用无缝线路设计来提供列车运行时的平稳性和舒适性,因此轨道结构多为长钢轨形式。由此对高架桥梁的下部结构产生了一个特殊的长轨纵向力。为使下部结构变形在纵向力作用下控制在规范要求的范围内,必须在设计中对下部结构在长轨纵向力作用下的表现进行研究。通过明珠线一期北延伸工程的设计实践认为:在长轨高架桥下部结构设计中合理地选择墩柱及基础形式是控制下部结构变形的关键,也是优化下部结构设计的关键。

Approach to Level Deformation Calculation and Control of Substructure of Elevated Bridge of Rail Traffic

In the design of elevated bridges of urban rail traffic joint less line design is generally used to provide the stability and amenity during operation of trains,therefore,most rail structure is a long rail form.So the longitudinal force of a special long rail is occurred in the substructure of elevated bridge.In order to control the deformation of the substructure under the action of the longitudinal force in the range of the specification requirements and it must study on the expression of the substructure under the longitudinal force of long rail in the design.Through the design practice of the northern extension project of Mingzhu No.1 stage Line it thinks that to reasonably select pier column and foundation form is the key for controlling the deformation of the substructure in the design of the substructure design of elevated bridge with long rails,it also is the key of optimizing the design of the substructure.