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中文摘要：
研究目的：为研究轨道约束下的大跨梁拱组合桥地震响应特性,以兰渝线上某（82＋172＋82）m连续梁拱组合桥为例,建立考虑梁轨相互作用的桥梁-轨道一体化有限元模型,研究地震激励下的主梁、墩台及轨道的受力特性。研究结论：（1）考虑轨道约束后,大跨梁拱组合桥的低阶纵向自振频率相比增加约30%~50%,而高阶竖向频率几乎不变;（2）地震激励下轨道对该桥主梁及墩台的位移及内力影响较大,如固定墩墩底内力最大减小23.69%;（3）地震激励下的最大钢轨应力达148 MPa,建议相关规范增设钢轨地震力这一检算指标;（4）线路阻力变化对墩底内力影响较小,增加桥墩刚度可显著减少地震作用下的钢轨应力;（5）该研究成果可对穿越震区的铁路桥梁抗震设计提供部分理论参考。
英文摘要：
Research purposes ： For analyzing the seismic response of long - span continuous beam - arch rail restraints, taking a （ 82 ＋ 172 ＋ 82） m long - span continuous beam - arch bridge on the Lanzhou railway as an example, the finite element model of track - bridge considering track - bridge interaction was the stress features of main girder, pier and track was analyzed under seismic excitation. bridge under - Chongqing established, Research conclusions： （ 1 ） The low - order longitudinal frequencies of the long - span beam - arch bridge will be increased by 30% - 50% under rail restraints. （2）The tracks have great influence on the displacement and internal forces of girder and pier, with maximum reduction 23.69% of internal force of fixed bearing pier. （3） The stress of track under seismic excitation can reach 148 MPa, so the index of rail seismic force is suggested to be added to the related railway specifications. （4） The change of rail restraints has less impact on the internal force of the pier bottom, while the increase of pier stiffness can significantly reduce the track stress under seismic action. （5）The research conclusions could provide some theoretical references for anti - seismic design of railway bridges across the quake zone.
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