桩基对混凝土连续梁桥地震响应的影响分析
发布时间：2018-09-12 12:59
【摘要】：近年来，世界上发生了多次地震，不仅让人们意识地震的破坏性和灾难性，也让学者开始更深入的研究有关桥梁在地震作用下的破坏机理，更深入的研究桥梁结构的抗震理论，为提出更好的抗震理论设计方法而奋斗。随着我国经济的高速发展，，桥梁的跨径也在不断的增大，而且桥梁型式也在不断的创新，研究桥梁在地震作用下的破坏原理，提高桥梁抗震能力，对于保证桥梁在强震作用下的安全性具有重要的工程意义。为了研究桩土相互作用对预应力混凝土连续梁桥在地震作用下的响应值的影响，本文主要对以下几个内容做了简单的研究： （1）简述了大跨径桥梁抗震设计以及桩土相互作用的研究现状，对桥梁抗震分析方法做了简单的介绍，对比分析了各方法的优缺点。 （2）以江西客家大桥为工程背景，利用Midas Civil2012有限元软件分别建立了不考虑桩土相互作用有限元模型I和考虑桩土相互作用的有限元模型II。 （3）通过计算有效振型参与质量，确定合理的振型分解反应谱法模态阶数,根据大桥所处的场地条件确定其设计反应谱，对两个有限元模型I、II分别进行了四种工况下的地震反应谱分析。 （4）结合场地条件，选择EI-Centro波作为地震动的输入，对两个有限元模型I和II进行了一致激励下的地震响应时程分析。 （5）分别对客家大桥反应谱法和时程分析法得到的内力和位移响应值进行对比分析，得出了相关结论，为以后类似桥梁的抗震分析和和设计提供参考。
[Abstract]:In recent years, there have been many earthquakes in the world, which not only make people realize the destructive and catastrophic earthquake, but also make scholars study more deeply the damage mechanism of bridges under earthquake and the seismic theory of bridge structures. In order to put forward a better seismic theory design method. With the rapid development of our country's economy, the span of the bridge is also increasing, and the bridge type is constantly innovating, studying the damage principle of the bridge under the action of earthquake, and improving the seismic capacity of the bridge. It is of great engineering significance to ensure the safety of bridge under strong earthquake. In order to study the effect of pile-soil interaction on the response value of prestressed concrete continuous beam bridge under earthquake, The main contents of this paper are as follows: (1) the present situation of seismic design and pile-soil interaction of long-span bridges is briefly described, and the seismic analysis method of bridges is introduced briefly. The advantages and disadvantages of each method are compared and analyzed. (2) taking Jiangxi Hakka Bridge as the engineering background, The finite element model I without considering pile-soil interaction and the finite element model II. (3) with consideration of pile-soil interaction are established by using Midas Civil2012 finite element software. The rational modal order of the mode decomposition response spectrum method is determined, and the design response spectrum of the bridge is determined according to the site conditions of the bridge. The seismic response spectra of the two finite element models IHII are analyzed under four different working conditions. (4) combined with the site conditions, the EI-Centro wave is selected as the input of the ground motion. The seismic response time history analysis of two finite element models I and II is carried out under uniform excitation. (5) the response values of internal force and displacement obtained by the response spectrum method and time history analysis method of Hakka Bridge are compared and analyzed respectively, and the relevant conclusions are obtained. It provides reference for seismic analysis and design of similar bridges in the future.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55
本文编号：2239076
[Abstract]:In recent years, there have been many earthquakes in the world, which not only make people realize the destructive and catastrophic earthquake, but also make scholars study more deeply the damage mechanism of bridges under earthquake and the seismic theory of bridge structures. In order to put forward a better seismic theory design method. With the rapid development of our country's economy, the span of the bridge is also increasing, and the bridge type is constantly innovating, studying the damage principle of the bridge under the action of earthquake, and improving the seismic capacity of the bridge. It is of great engineering significance to ensure the safety of bridge under strong earthquake. In order to study the effect of pile-soil interaction on the response value of prestressed concrete continuous beam bridge under earthquake, The main contents of this paper are as follows: (1) the present situation of seismic design and pile-soil interaction of long-span bridges is briefly described, and the seismic analysis method of bridges is introduced briefly. The advantages and disadvantages of each method are compared and analyzed. (2) taking Jiangxi Hakka Bridge as the engineering background, The finite element model I without considering pile-soil interaction and the finite element model II. (3) with consideration of pile-soil interaction are established by using Midas Civil2012 finite element software. The rational modal order of the mode decomposition response spectrum method is determined, and the design response spectrum of the bridge is determined according to the site conditions of the bridge. The seismic response spectra of the two finite element models IHII are analyzed under four different working conditions. (4) combined with the site conditions, the EI-Centro wave is selected as the input of the ground motion. The seismic response time history analysis of two finite element models I and II is carried out under uniform excitation. (5) the response values of internal force and displacement obtained by the response spectrum method and time history analysis method of Hakka Bridge are compared and analyzed respectively, and the relevant conclusions are obtained. It provides reference for seismic analysis and design of similar bridges in the future.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55
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