Pushover分析方法在RC框架结构中应用的研究

发布时间：2018-04-19 07:33

本文选题：Pushover分析 + 时程分析　；参考：《苏州科技大学》2016年硕士论文

【摘要】：地震作为一种突发性的自然灾害,往往在没有什么预兆的情况下突然来临,灾后的次生灾害如瘟疫、水灾等,给重建工作带来了重重困难。根据建筑物的实际条件,采取科学有效的设计方法和措施是目前抗震的最有效的途径。Pushover分析作为基于性能抗震设计的重要方法,以其自身的优势,广泛应用到各种建筑结构形式中。但是水平加载模式的选取是Pushover分析方法的关键环节,将直接影响到结构模型分析结果的准确性。本文较全面地论述了Pushover分析方法的发展背景和概况以及其基本理论、优缺点。介绍了常用的几种水平加载模式和常用的Pushover分析方法,并阐述了时程分析的基本理论和地震波选取的关键因素。本文选取五种常用的侧向加载模式,对三栋不同高度的RC框架结构进行Pushover分析,模拟得到结构在罕遇地震下的性能点参数,并与非线性时程法模拟得到的最大楼层位移、层间位移、层间位移角、层间剪力和塑性铰分布状况等进行对比分析,对RC框架结构进行Pushover分析选取的加载模式进行了归纳并提出了一些建议。得出不同的侧向加载模式在低层结构中Pushover分析具有良好的精确度,随着结构高度的增加,结构反应的分析结果有一定的离散型,对于高层结构应多选取考虑高阶振型的水平加载模式,取平均值减少误差。本文利用Pushover分析方法对单向偏心结构的扭转进行了研究,提出了调整单向偏心结构的刚度调整算法,用一个八层单向偏心结构算例进行验证并取得良好的效果。
[Abstract]:Earthquake, as a sudden natural disaster, often comes suddenly without any warning. The secondary disasters after the disaster, such as plague, flood and so on, bring a lot of difficulties to the reconstruction work.According to the actual conditions of buildings, it is the most effective way to use scientific and effective design methods and measures. Pushover analysis, as an important method of performance-based seismic design, has its own advantages.Widely used in various forms of building structure.However, the selection of horizontal loading mode is the key link of Pushover analysis method, which will directly affect the accuracy of structural model analysis results.In this paper, the development background, general situation, basic theory, advantages and disadvantages of Pushover analysis method are discussed.Several commonly used horizontal loading modes and Pushover analysis methods are introduced, and the basic theory of time-history analysis and the key factors of seismic wave selection are expounded.In this paper, five commonly used lateral loading modes are selected to analyze three RC frame structures with different heights by Pushover analysis. The performance point parameters of the structures under rare earthquakes are simulated, and the maximum floor displacement obtained by nonlinear time-history method is simulated.Based on the comparative analysis of interstory displacement, interstory displacement angle, interstory shear force and plastic hinge distribution, the loading modes selected for Pushover analysis of RC frame structures are summarized and some suggestions are put forward.It is concluded that different lateral loading modes have good accuracy in Pushover analysis of low-rise structures. With the increase of structural height, the results of structural response analysis have a certain discrete type.For high-rise structures, the horizontal loading mode with higher vibration modes should be chosen, and the average value should be taken to reduce the error.In this paper, the torsion of unidirectional eccentric structure is studied by using Pushover analysis method, and the stiffness adjustment algorithm of unidirectional eccentric structure is proposed, which is verified by an example of an eight-story unidirectional eccentric structure and good results are obtained.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU375.4;TU352.11

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