洞庭湖大桥地震反应分析及减隔震研究

发布时间：2018-06-30 09:39

本文选题：MIDAS/civil + 斜拉桥　；参考：《石家庄铁道大学》2016年硕士论文

【摘要】：在建荆岳铁路洞庭湖大桥是世界上第一座三塔双柱跨斜拉桥,跨度布置为(98+140+406+406+140+98)m。主梁采用钢箱钢桁组合梁形式。本文主要介绍了斜拉桥的发展历程、地震的震害以及减隔震装置的概况,介绍了桥梁地震反应分析所采用的四种种理论——静力法、反应谱法、动力时程分析法和随机振动法,并在此基础上,以洞庭湖大桥为工程实例,采用有限元计算软件,建立了全桥空间有限元模型,对该桥进行了弹性时程分析和减震技术研究。主要工作如下:(1)利用Midas/civil有限元软件建立全桥空间有限元模型,并对其动力特性进行分析,计算自振周期及频率,并给出了前十阶振型图。(2)选取三条地震波,运用时程分析法,分别计算纵桥向、横桥向和竖向的地震响应。(3)分别讨论了中塔支座弹性刚度、粘滞阻尼器参数以及两者组合作用对该桥地震反应的影响。分别对弹性装置与粘滞阻尼器的主要设计参数进行了探讨,分析了弹性刚度、阻尼系数、阻尼指数对结构地震响应的影响,给出三个参数建议值。(4)最后对三种减隔震方案的减隔震效果进行了对比分析,结果表明调整中塔支座弹性刚度会减小地震反应,但梁端位移过大;只设置阻尼器,减震效果有限。两者的结合可以取得更好的减隔震效果。
[Abstract]:Dongting Lake Bridge of Jingyue Railway is the first three-tower two-column span cable-stayed bridge in the world, with a span of (98 140 406 406 140 98) m. The main beam adopts steel box steel truss composite beam form. This paper mainly introduces the development course of cable-stayed bridge, earthquake damage and the general situation of isolation device, and introduces four kinds of theories used in seismic response analysis of bridges, such as static method, response spectrum method, dynamic time-history analysis method and random vibration method. On this basis, taking Dongting Lake Bridge as an engineering example, the spatial finite element model of the whole bridge is established by using finite element calculation software, and the elastic time history analysis and seismic absorption technology of the bridge are studied. The main work is as follows: (1) using Midas / civil finite element software to establish the full bridge spatial finite element model, and to analyze its dynamic characteristics, to calculate the natural vibration period and frequency, and to give the first ten vibration mode diagrams. (2) three seismic waves are selected, and the time-history analysis method is used. The seismic responses of longitudinal, transverse and vertical bridges are calculated respectively. (3) the effects of elastic stiffness, viscous damper parameters and the combination of the two factors on the seismic response of the bridge are discussed respectively. The main design parameters of elastic device and viscous damper are discussed, and the effects of elastic stiffness, damping coefficient and damping index on the seismic response of the structure are analyzed. Finally, the results show that adjusting the elastic stiffness of the middle tower support will reduce the seismic response, but the beam end displacement is too large. The damping effect is limited. The combination of the two can achieve better seismic isolation effect.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U442.55

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