公轨合建上加劲连续钢桁梁桥抗震设计研究  

Research on Seismic Design of Multipurpose Continuous Steel Truss Girder Bridge Stiffened with Rigid Cables

作　　者：于俊杰[1] 周成[2] YU Jun-jie;ZHOU Cheng(China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《世界桥梁》2023年第S01期117-124,共8页World Bridges

摘　　要：永宁大桥主桥为主跨260 m的公轨合建上加劲双层连续钢桁梁桥,集市域铁路、快速路、一级公路、慢行系统、市政管线等功能于一体。针对该桥抗震设计,根据合理安全度原则,确定抗震设防标准和性能验算方法,采用SAP2000建立全桥常规抗震体系动力有限元模型,分析上、下部结构的抗震性能和行车安全性能,在此基础上确定合理的抗震设计措施。鉴于列车质量不足主梁质量的4%,有限元模型中列车质量可忽略。结果表明:主、引桥上部结构在E2地震下处于弹性工作状态,主桥下部结构在E2地震下保持基本弹性,引桥在E2地震下部分桥墩屈服,E1地震下行车安全验算满足规范要求。综合考虑桥梁性能要求和经济指标,该桥采用常规抗震体系,仅通过局部增加桥墩配筋,桥梁按延性设计即可满足抗震设防标准要求。The Yongning Bridge is a continuous steel truss girder bridge stiffened with rigid cables.With a main span of 260 m,the bridge is a multipurpose double-decker that accommodates urban railway,fast track,grade I roadway,pedestrian/cycle path and public utilities.The seismic fortification criteria and performance checking methods were selected in accordance with the seismic design of the bridge as well as the rational safety principle.The seismic responses of the superstructure and substructure of the bridge as well as vehicle running safety on the bridge were simulated in SAP2000,based on which the seismic design strategies were determined.Being less than 4%of the mass of the superstructure,the mass of vehicles should be omitted in finite element analysis.It is shown that the superstructure of the main and approach bridges is in elastic working condition under E2 earthquakes,the substructure of the main bridge maintains basic elasticity,and several piers of the approach bridges yield under E2 earthquakes.Under E1 earthquakes,the vehicle running safety is verified meeting the code requirements.To address the seismic performance requirements and economy,a conventional seismic system was utilized.Adding merely reinforcement locally in piers allows the ductility design of the bridge to meet the seismic fortification standard.

关 键 词：公轨合建桥 上加劲连续钢桁梁 抗震设防标准 性能验算方法 常规抗震体系 抗震性能 行车安全性能 抗震设计 

分 类 号：U448.211[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]