大跨连续刚构桥抗震性能研究

发布时间：2018-10-08 20:43

【摘要】：地震的频繁发生,使人们的生命和财产受到了严重的威胁和损失。桥梁作为重要的生命线工程,在整条线路中发挥着重要的作用,桥梁一旦发生破坏,将会影响整个交通的通常运营,促使次生灾害的发生,导致更为严重的后果。所以,深入了解桥梁的地震响应,确立安全、可靠的抗震体系,就成了各位专家和设计人员面前的一个重要课题。本文以纵目沟特大桥为主要研究对象,应用三个有限元模型,对其进行反应谱分析和动力时程分析,计算桩—土—结构相互作用和桩-土-承台-结构相互作用时对桥梁地震响应值的影响,主要包括以下几个方面:(1)列举了一些典型的震害实例,简单概述了一下国内外的研究现状,确定了桥梁抗震的重要意义。(2)介绍了几种常用的抗震分析方法,如静力法、反应谱法、动力时程分析法等,为后面的分析和计算过程奠定了理论基础。(3)以纵目沟特大桥为主要研究对象,建立了三种不同的分析模型,并计算桩土相互作用的土弹簧刚度和各自的自振特性。(4)利用两种分析方法,根据相关的地震动参数和陕西省地震局二测中心提供的三条安评地震波进行内力和位移的分析计算,得出一些有益的结论。通过对纵目沟特大桥的地震反应分析,能够为类似的桥梁抗震设计提供相关的参照和比较。
[Abstract]:With the frequent occurrence of earthquakes, people's lives and property are seriously threatened and lost. Bridge, as an important lifeline project, plays an important role in the whole line. Once the bridge is damaged, it will affect the normal operation of the whole traffic, promote the occurrence of secondary disasters, and lead to more serious consequences. Therefore, it is an important task for experts and designers to deeply understand the seismic response of bridges and establish a safe and reliable seismic system. In this paper, three finite element models are used to analyze the response spectrum and dynamic time history of Longmugou Bridge. The effects of pile-soil-structure interaction and pile-soil-cap structure interaction on the seismic response of bridges are calculated, including the following aspects: (1) some typical earthquake damage examples are given. The research status at home and abroad is briefly summarized, and the significance of seismic analysis of bridges is determined. (2) several commonly used seismic analysis methods, such as static method, response spectrum method, dynamic time-history analysis method and so on, are introduced. It lays a theoretical foundation for the later analysis and calculation process. (3) taking Longmugou Bridge as the main research object, three different analysis models are established. The soil spring stiffness of pile-soil interaction and their natural vibration characteristics are calculated. (4) the internal forces and displacements are calculated according to the relevant seismic parameters and three seismic waves provided by the second seismic survey center of Shaanxi Seismological Bureau. Draw some useful conclusions. The seismic response analysis of Longmugou Bridge can provide a reference and comparison for the seismic design of similar bridges.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.23

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