【作者】 杨杰；

【导师】 刘蓉华；

【作者基本信息】 西南交通大学 ， 结构工程， 2008， 硕士

【摘要】 目前,静力弹塑性分析方法以其实用性较强的优点受到越来越多的关注,已经被列入《建筑结构抗震设计规范》作为结构弹塑性变形验算之一。本文首先概述了建筑结构的抗震设计思想、抗震分析、设计方法,接着介绍了静力弹塑性Pushover分析方法的国内外现状,对目前比较流行的几种Pushover方法进行了研究,指出其不足之处:这种方法很大程度上依赖于水平荷载分布模式,只考虑了对应基本振型的地震作用,忽略了高阶振型的影响。在实际的高层建筑结构中,结构的位移向量是由多阶振型共同决定的。尤其对于长周期结构,高阶振型对结构的地震作用效应是不可忽略的。其考虑与否直接影响Pushover分析结果的准确程度。鉴于此情况,本文采用了模态Pushover分析方法(MPA),并结合能力谱法对其进行改进。在本方法中,考虑了合理振型数的选择,采用了振型分解方法的基本原理,考虑强度折减的弹塑性反应谱,使分析结果更接近结构在大震作用下的实际性能。利用有限元分析软件SAP2000和ETABS针对二幢高层钢筋混凝土框架分别进行时程分析和Pushover分析及改进的MPA分析,算例表明由于改进的MPA方法考虑了高阶振型的影响,从而使其结果更准确。更多还原

【Abstract】 Nonlinear static procedure (NSP) has attracted the attention of more and more researchers for its merits of practicality. It has become one of checking computations tools for nonlinear distortion.Design procedure and analysis method of structure in earthquake are firstly introduced in this thesis. Then introduced the nonlinear static analysis of the research and development status, and introduced several kinds of static elastic-plasticity analysis method which was representative, This paper also introduced several kinds of static elastic-plasticity analysis method which was representative, and point out their disadvantages: this approach to a large extent ,dependent on the level of load distribution, but was considered the mode correspond to the role of the earthquake,ignored the high mode.In practice, the high-rise building,the structure of the displacement vector is a multistage mode of co-decision. In particular, the long-period strcture, the hige mode of the structure of the seismic effect can not be ignored.The high model is very important to the static pushover analysis. Especially in the high-rise structure .The option of the high model will effect the result of static Pushover analysis directly. This thesis introduces and improves the modal pushover analysis method. In the method, the consideration of the appropriate selects of reasonable numbers of modes and adoption of the basic principles of the type modal decomposition method and the elastic-plastic response spectra considering strength reduce coefficient make the analysis results even near the actual performances of structures in big earthquake.By making use of the finite element analysis program SAP2000 and ETABS, makes dynamic time history analysis ,Pushover analysis and Modal Pushover analysis on two high-rise RC building .The research results revealed that the adoption of static-plastic analysis method in this paper to conduct a Pushover analysis on structures can possesses high-accuracy calculation.更多还原