城市混凝土曲线梁桥地震易损性的调查与分析

发布时间：2018-11-02 17:27

【摘要】：近年来,由于地震的频繁发生,生命线工程的安全性越来越受到人们的关注,而桥梁工程作为生命线工程的核心,首当其冲成为专家学者们研究的对象。这些研究以地震易损性曲线的形式表征桥梁结构的易损性,描述了桥梁损伤概率与地面运动参数之间的关系。在总结已有研究成果与方法的基础上,结合福州市城市混凝土曲线梁桥的调查结果,选取具有代表性的基准桥,对基准桥中最易损伤的构件进行地震易损性分析,并得到系统易损性曲线。总的来说,主要进行了以下几个方面的工作,并取得了相应的成果。1、通过国内外文献的收集与浏览,简单介绍了梁式桥梁的震害,并系统的回顾与总结了易损性分析方法以及构件损伤准则及指标,为桥梁损伤指标确定和易损性曲线建立提供理论基础。2、借助大型通用有限元软件SAP2000,结合福州市曲线梁桥的调查与文献的整理,选出具有代表性的基准桥,建立空间有限元分析模型。3、采用增量动力分析方法,对曲线梁桥进行非线性时程分析,获得结构在不同地震动作用下的地震响应。通过统计回归,采用Origin作图软件得到各独立构件的易损性曲线,确定最易损伤构件及位置。4、通过参数分析,研究曲线梁桥在主要结构参数改变时的结构地震反应变化趋势,分析曲率半径、墩高以及支座的布置方式的变化对结构易损性的影响,并获得一定的规律,为今后的桥梁设计与维护提供一定的理论依据。最后,对研究中存在的不足进行简要的说明与讨论,为进一步的工作方向提出总结与建议。
[Abstract]:In recent years, because of the frequent occurrence of earthquakes, people pay more and more attention to the safety of lifeline engineering. As the core of lifeline engineering, bridge engineering is the first research object of experts and scholars. These studies represent the vulnerability of bridge structures in the form of seismic vulnerability curves and describe the relationship between bridge damage probability and ground motion parameters. On the basis of summarizing the existing research results and methods, combined with the investigation results of urban concrete curved girder bridges in Fuzhou, the representative reference bridges are selected to analyze the seismic vulnerability of the most vulnerable components in the reference bridges. The system vulnerability curve is obtained. In general, the following aspects of the work are mainly carried out, and the corresponding results have been obtained. 1. Through the collection and browsing of domestic and foreign literature, the earthquake damage of beam bridges is briefly introduced. A systematic review and summary of vulnerability analysis methods, damage criteria and indicators of components, which provides a theoretical basis for the determination of bridge damage index and the establishment of vulnerability curve. 2. With the help of SAP2000, a large scale universal finite element software, Combined with the investigation of curved girder bridge in Fuzhou and the arrangement of literature, the representative reference bridge is selected, and the spatial finite element analysis model is established. 3. The nonlinear time history analysis of curved beam bridge is carried out by using incremental dynamic analysis method. The seismic responses of structures under different ground motions are obtained. Through statistical regression, the vulnerability curve of each independent component is obtained by using Origin software, and the most vulnerable component and its location are determined. Through parameter analysis, the variation trend of structural seismic response of curved beam bridge under the change of main structural parameters is studied. The influence of the radius of curvature, the height of the pier and the arrangement of the support on the vulnerability of the structure is analyzed, and the certain rules are obtained, which provide a certain theoretical basis for the design and maintenance of the bridge in the future. Finally, the shortcomings of the research are briefly explained and discussed, and some suggestions for further work are put forward.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

【相似文献】