基础边界及衰减系数对高墩桥梁抗震性能影响分析

发布时间：2018-11-15 18:18

【摘要】：“桥通则路通”,桥梁安全是道路畅通的重要保障。进入21世纪以来,随着地壳活动的频繁,地震灾害越来越多,桥梁安全的抗震性能是抗震救灾的重要依赖,越来越受到政府和人们的重视。因此,如何在设计过程中提高桥梁的抗震性能,保证结构的安全,一直是广大桥梁工程师研究的重点。而在众多的理论分析和研究中,基础的边界条件和桥梁结构衰减特性又是其中的难点,对其进行分析研究,得出有益结论,可以为桥梁抗震提供依据。因此,有其重要的现实意义。本文在阐述结构地震反应分析基本理论的基础上,对渤海大道跨土羊高速立交桥分别进行了不同基础边界条件下的地震反应谱分析和不同衰减特征下的地震动时程分析,主要内容有： 1)采用桥梁有限单元设计软件MIDAS Civil建立桥梁结构空间有限单元模型,并且对其进行振型模态分析； 2)在三种不同基础边界条件下进行地震反应谱分析,并比较其结果,观察总结基础边界条件对地震反应的影响； 3)在三种不同衰减特征值条件下进行地震时程反应分析,并比较其结果,观察总结衰减特征对地震反应时程分析的影响； 4)对以上结果进行分析总结,得出有益结论,为今后进行桥梁抗震分析提供依据。
[Abstract]:Bridge safety is an important guarantee for smooth road. Since the 21st century, with the frequent crustal activities, more and more earthquake disasters, the seismic performance of bridge safety is an important dependence of earthquake relief, more and more attention has been paid by the government and people. Therefore, how to improve the seismic performance of bridges and ensure the safety of structures in the design process has been the focus of bridge engineers. In many theoretical analysis and research, the boundary conditions of foundation and the attenuation characteristics of bridge structure are the difficulties. Therefore, has its important practical significance. On the basis of expounding the basic theory of structural seismic response analysis, the seismic response spectrum analysis under different basic boundary conditions and the time-history analysis of ground motion under different attenuation characteristics have been carried out for the Bohai highway crossing Tuyang high speed interchange. The main contents are as follows: 1) using the bridge finite element design software MIDAS Civil to establish the bridge structure spatial finite element model and carry on the modal analysis to it; 2) the seismic response spectrum analysis is carried out under three different basic boundary conditions, and the results are compared, and the influence of the basic boundary conditions on the seismic response is observed and summarized. 3) the seismic time-history response analysis is carried out under three different attenuation eigenvalues, and the results are compared, and the effects of attenuation characteristics on seismic response time-history analysis are observed and summarized. 4) the above results are analyzed and summarized, and some useful conclusions are drawn, which provide the basis for the seismic analysis of bridges in the future.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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