减隔震梁桥简化分析方法及设计参数优化研究  

Study on simplified analysis method and design parameter optimization of seismic isolation bridge

作　　者：刘陆宇 李杨杰 焦驰宇[4,5] Liu Lu-yu;Li Yang-jie;Jiao Chi-yu(Beijing Municipal Engineering Professional Design Institute Co.Ltd,Beijing 100037,China;Multi-Functional Shaking Tables Laboratory,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Top Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Ancient bridge Research Institute,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京市市政专业设计院股份公司,北京100037 [2]北京建筑大学大型多功能振动台阵实验室,北京100044 [3]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 [4]北京建筑大学未来城市设计高精尖创新中心,北京100044 [5]北京建筑大学古桥研究院,北京100044

出　　处：《工程抗震与加固改造》2023年第6期61-67,85,共8页Earthquake Resistant Engineering and Retrofitting

摘　　要：现今桥梁结构抗震体系,可归纳为两种:一是按延性抗震设计的桥梁,利用桥梁墩柱发生塑性变形,延长结构周期,耗散地震能量;二是利用减隔震支座的塑性变形减少结构地震反应。减隔震体系梁桥因其具有下部结构地震反应小、结构损伤小、修复速度快等特点,近年来被广泛应用于各类桥梁建设。但在设计过程中,对减隔震梁桥的简化分析方法尚不明确,且对减隔震支座设计参数确定尚无优化方法可循。本文选取一联(30+34.5+30)m连续箱梁桥为研究对象,设计采用摩擦摆减隔震支座,分别采用单振型反应谱法、时程分析法进行对比分析,随后对不同设计参数下的桥梁地震反应进行对比分析,明确不同设计阶段所采用计算方法,以及设计时应重点关注的支座参数,并给出相应优化取值方法。Nowadays,the seismic system of bridge structure can be summarized as the following two kinds:one is the bridge designed according to ductile seismic philosophy,which takes advantage of plastic deformation of bridge piers and columns to extend the structure period and dissipate seismic energy;the second is to reduce the seismic response of the structure by using the plastic deformation of the isolation bearings.Damping and isolation system bridges are widely used in recent years,because of their low seismic response,small structural damage and fast repair speed.However,in the design process,the analysis method for the seismic isolation bridge is not clear,and there is no clear standard to determine the design parameters of the isolation bridge.A(30+34.5+30)m continuous box girder bridge is selected as the research background in this paper.Friction pendulum damping isolation support is designed and analyzed by single mode response spectrum method and time history analysis method respectively.Then the seismic responses of bridges under different design parameters are compared and analyzed,the calculation methods used in different design stages and the bearing parameters that should be paid attention to in design are defined,and the corresponding optimization method is given.

关 键 词：梁桥 单振型反应谱法 FPS摩擦摆减隔震支座 

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]