模态静力非线性分析中模态选择的研究  

Study on the mode selection in the modal pushover analysis

作　　者：卢文生[1] 吕西林[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《地震工程与工程振动》2004年第6期32-38,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50025821);创新研究群体基金项目(50321803)

摘　　要：本文应用模态静力非线性分析方法,对多个算例进行了静力非线性分析。比较分析了不同振型组合对计算精度的影响,对模态选择的参数进行了研究,提出采用模态质量参与系数进行模态选择的控制,为模态静力非线性分析方法的推广使用提供参考。另外,分析了结构基本周期对该方法计算精度的影响。Using the method of modal pushover analysis (MPA), a lot of examples were calculated in the paper to build up the relationship between the effective modal mass participation ratio and the displacement calculation errors with the increase of the including vibration modes. And the influence of the natural period on the computation accuracy was also analyzed. It is shown that the satisfying results can be obtained only if effective modal mass participation ratio is greater than 0.8, which set up the criterion of mode selection in MPA. Moreover, natural period of the structure has a great influence on the calculation results of nonlinear static procedure. As to long period structures, especially when the natural period of structure is close to the predominant period of ground motion, errors may become very drastic if only low order modes are considered and thus higher modes should be involved in the analysis.

关 键 词：模态静力非线性分析 模态质量参与系数 振型参与系数 模态选择准则 

分 类 号：P315.95[天文地球—地震学]