城市快速路与轨道交通合建高架桥桥墩设计研究

为节省用地和减少工期，某机场快速路工程采用城轨共建的双层高架桥结构型式，下部结构采用Y形桥墩。城市快速路与轨道交通合建高架桥是一种节省空间、提高效率、美化环境的新型桥梁结构，但也面临着复杂的受力和抗震问题。为满足公路规范和铁路规范的要求，对下横梁及桥墩采用容许应力法和极限状态法双重控制设计。在抗震设计中，考虑轨道梁无缝线路长钢轨约束的影响以及加入基础和后继结构的影响，计算结果更准确合理。计算结果表明桥梁的静动力性能均能满足规范要求，为该类桥梁的设计施工提供依据。

Analysis on Design of Viaduct Pier Co-built for Urban Expressway and Rail Transit

In order to save the land and reduce the construction period, the double-layer viaduct structure type co-built for urban expressway and rail transit is adopted in an airport expressway project. Its substructure is a Y-type pier. The co-built viaduct of urban expressway and rail transit is a new bridge structure to save the space, improve the efficiency and beautify the environment, and but also faces the complex force and seismic problems. In order to meet the requirements of highway and railway specifications, the lower crossbeams and piers are designed with the dual control of allowable stress method and limit state method. In the seismic design, the influence of the long steel rail restraint of the seamless line of the track girders should be considered, and the influence of the incorporated foundation and the succeeding structure are also considered, which can be calculated more accurately and reasonably. The calculation results show that the static and dynamic properties of the bridge can meet the code requirements. The basis is provided for the design and construction of this type of bridge.