双层离港高架桥梁抗震体系对比研究  

Comparative study on earthquake resistance systems of double-deck departure viaduct

作　　者：程京伟 马辉 焦驰宇[4,5] Cheng Jing-wei;Ma Hui;Jiao Chi-yu(Beijing Municipal Engineering Design and Research Institute Co.Ltd,Beijing 100082,China;Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Ancient Bridge Research Institute,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Multi-Functional Shaking Tables Laboratory,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京市市政工程设计研究总院有限公司,北京100082 [2]北京建筑大学工程结构与新材料北京市高等学校工程研究中心,北京100044 [3]北京建筑大学古桥研究院,北京100044 [4]北京建筑大学大型多功能振动台阵实验室,北京100044 [5]北京建筑大学未来城市设计高精尖创新中心,北京100044

出　　处：《工程抗震与加固改造》2024年第2期87-95,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(52078023);北京市属高校基本科研业务费项目(X20094)。

摘　　要：双层高架桥是城市桥梁建设中常用的一种桥梁形式,可合理利用空间,减少交通拥堵。随着北京某机场的建成,“双层出发,双层到达”的设计理念使得双层离港高架桥得到快速发展,但在设计过程中,航站楼建筑物与桥梁结构组合时,桥梁结构体系选择显得尤为重要。本文以北京某机场双层离港高架桥为研究对象,根据相关工程情况设计了墩梁固结、上层支座和双层支座3种典型结构体系,建立线弹性分析模型,对常遇地震下结构地震反应进行对比研究,分析表明墩梁固结体系地震位移和内力较小,具有良好的抗震性能;随后对3种体系考虑墩柱塑性铰损伤行为的力学性能开展了罕遇地震下非线性时程反应分析,研究表明上层支座随着弯矩反弯点的变化,墩柱转角需求最小,同时三者的纵横向墩柱转动能力均满足抗震需要。综合对比分析在本文探讨的地震情况下,3种结构体系,墩梁固结体系由于整体刚度大、地震参与质量小进而导致内力位移响应小,具有良好的抗震性能优势。同时本文研究成果可为同类桥梁提供技术支持。Double-deck viaduct is a commonly used bridge form in urban bridge construction,which can rationally utilize space and reduce traffic congestion.With the completion of an airport in Beijing,the design concept of"double-deck departure,double-deck arrival"has led to the rapid development of the double-deck departure viaduct.However,during the design process,when a terminal building is combined with the bridge structure,the choice of bridge structure system is particularly important.In this paper,the double-deck departure viaduct of an airport in Beijing was taken as the research object,and three typical structural systems of pier girder consolidation,upper support and double-layer bearing according to the relevant engineering conditions were designed,and the linear elastic analysis model was established.The seismic responses of the three structural systems were comparatively studied,and the analysis shows that the seismic displacement and internal force of the pier beam consolidation system are small and have good seismic performance.The time history response analysis shows that the rotation angle of the pier column is the smallest with the change of the bending point in the upper support system.Under the earthquake conditions discussed in this paper,the system of pier-beam consolidation has a good seismic performance in the three structural systems because of its large overall stiffness and small seismic participation mass,and results in small internal force and displacement response.The research results of this paper can provide technical support for similar bridges.

关 键 词：双层高架桥 结构体系对比 反应谱分析 非线性时程分析 塑性铰 

分 类 号：U448.21[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]