基于Pushover的石拱桥地震响应分析

发布时间：2018-01-29 18:10

本文关键词： Pushover 能力谱模态Pushover 石拱桥　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国是一个地震多发国家，而桥梁工程在整个交通运输行业有着不可替代的作用。开展桥梁结构抗震研究，提高桥梁结构抗震性能，是我国交通建设面临的重大课题。本文以Pushover分析方法在石拱桥上的运用为基本出发点，研究了Pushover分析方法、能力谱法和模态Pushover分析方法在石拱桥结构弹塑性地震响应分析中的应用，并结合司庄石拱桥实例，对其适用性进行了讨论。文中介绍了Pushover分析方法的基本原理和步骤，同时介绍了常见的几种侧向加载分布形式和控制节点的选择方法。结合石拱桥实例把采用三种侧向加载分布形式的结果与时程分析的结果进行了比较，分析可知对于石拱桥的横桥向来讲，在不考虑拱上建筑时，倒三角侧向加载分布形式的Pushover分析方法所得的位移结果与弹塑性时程分析的结果最为接近。文中详细阐述了ATC-40能力谱法、Chopra的改进能力谱以及简化能力谱的基本理论和实施步骤。利用Pushover分析的结果曲线，分别采用三种方法对实例石拱桥的主拱圈进行了地震响应分析，主要针对位移值进行讨论。研究表明Chopra的改进能力谱法计算精度最高，而简化的能力谱法计算精度没有Chopra的改进能力谱法高，但是计算过程简单。文中介绍了模态Pushover分析方法的基本原理和基本步骤，这种方法的优点在于考虑了高阶振型对结构的影响，，同时计算了实例桥在这种方法下的地震响应，并与弹塑性时程分析的结果进行了对比，表明模态Pushover分析方法的精度要比第四章的三种能力谱分析方法都要高。论文的研究成果可以作为同类桥梁Pushover分析的依据，对其它类似的桥梁Pushover分析也有一定的参考价值。
[Abstract]:China is an earthquake prone country, and bridge engineering plays an irreplaceable role in the transportation industry. To carry out the research on seismic resistance of bridge structure, improve the seismic performance of bridges, is a major issue facing traffic construction in China. Based on the Pushover analysis methods used in the stone bridge on as the basic starting point. The research on Pushover analysis method, capacity spectrum method and modal analysis method of Pushover plastic earthquake in stone arch bridge structure elastic response, and combined with the example of our village stone arch bridge, its applicability is discussed. This paper introduces the basic principle and procedure of Pushover analysis, and introduces several methods of lateral selection load distribution and control node. Combined with the common examples of stone arch bridge have been compared with three kinds of loading distribution form lateral results analysis and time history analysis results for stone Cross bridge to bridge, without considering the arch, displacement results of inverted triangle lateral loading distribution form of Pushover obtained by analysis and results of elasto-plastic time history analysis is most close. In this paper ATC-40 capacity spectrum method, the basic theory of Chopra improved capacity spectrum and simplified capacity spectrum and the implementation steps. The results of the analysis using Pushover curves, three methods were used for the main arch example of stone arch bridge is established for seismic response analysis, mainly for displacement are discussed. Research shows that Chopra improved capacity spectrum method calculation accuracy, improved capacity and simplified capacity spectrum method calculation accuracy without Chopra spectrum high, but simple calculation process. This paper introduces the basic principle of modal Pushover analysis method and basic steps, the advantage of this approach is to consider the influence of higher modes on the structure, at the same time. In this method the seismic response of bridge. Examples, and compared with the elastoplastic analysis results show that modal analysis method of Pushover precision to three than the fourth chapter of the spectral analysis method are higher. The research results of the thesis can be used as the basis of Pushover analysis of similar bridges, there are certain the reference value for other similar bridge Pushover analysis.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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