城市轨道交通高架桥抗震分析  

Seismic Analysis of an Urban Rail Transit Viaduct

作　　者：吴斐璠 段丁丁 王兴中 李向杰 Wu Feifan;Duan Dingding;Wang Xingzhong;Li Xiangjie(Beijing Jianyetong Engineering Testing Technology Co.,Ltd.,Beijing 102600,China)

机构地区：[1]北京建业通工程检测技术有限公司,北京102600

出　　处：《市政技术》2023年第12期45-55,共11页Journal of Municipal Technology

摘　　要：参照GB 50909—2014《城市轨道交通结构抗震设计规范》对某城市轨道交通高架桥提出了抗震分析的内容、方法和要点,采用Midas Civil软件建立了桥梁有限元模型,分析了不同地震作用下高架桥的抗震性能。通过分析可知,在顺桥向地震作用下矮墩先于高墩出现塑性铰,在横桥向地震作用下高墩先于矮墩出现塑性铰;在进行抗震设计时,除需满足桥墩的抗震性能,还需要考虑主梁的正应力和墩梁固结处的剪应力;双肢薄壁墩墩身系梁的合理布置能有效提高桥梁结构的抗震性能。相关结论为类似桥梁的分析研究提供了重要参考。Taking an urban rail transit viaduct as an example,the content,methods and key points of seismic analy-sis of urban rail transit viaduct are proposed based on GB 509092014"Code for seismic design of urban rail transit structures".The finite element model of the bridge is established by Midas Civil software to analyze the seismic per-formance of the viaduct under different earthquakes.The analysis shows that the plastic hinge of the low pier pre-cedes the high pier under the longitudinal bridge earthquake.The plastic hinge of the high pier precedes the low pier under the transverse bridge earthquake;The normal stress of the main beam and the shear stress at the consolidation of the pier beam should be considered in addition to the seismic performance of the pier when seismic design is con-ducted;The reasonable arrangement of the tie beams of double-limb thin-wall pier can effectively improve the seis-mic performance of the bridge structure.The relevant conclusions provide important reference for the analysis and research of similar bridges.

关 键 词：城市轨道交通高架桥 抗震分析 地震作用 动力特性分析 反应谱分析 时程反应分析 双肢薄壁墩 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]