王丰, 李宏男. 双向地震激励下的两阶段多维Pushover分析[J]. 工程力学, 2014, 31(10): 188-194. DOI: 10.6052/j.issn.1000-4750.2013.10.0962
引用本文: 王丰, 李宏男. 双向地震激励下的两阶段多维Pushover分析[J]. 工程力学, 2014, 31(10): 188-194. DOI: 10.6052/j.issn.1000-4750.2013.10.0962
WANG Feng, LI Hong-nan. TWO-STAGE MULTI-DIMENSIONAL PUSHOVER ANALYSIS FOR BI-DIRECTIONAL EARTHQUAKE EXCITATIONS[J]. Engineering Mechanics, 2014, 31(10): 188-194. DOI: 10.6052/j.issn.1000-4750.2013.10.0962
Citation: WANG Feng, LI Hong-nan. TWO-STAGE MULTI-DIMENSIONAL PUSHOVER ANALYSIS FOR BI-DIRECTIONAL EARTHQUAKE EXCITATIONS[J]. Engineering Mechanics, 2014, 31(10): 188-194. DOI: 10.6052/j.issn.1000-4750.2013.10.0962

双向地震激励下的两阶段多维Pushover分析

TWO-STAGE MULTI-DIMENSIONAL PUSHOVER ANALYSIS FOR BI-DIRECTIONAL EARTHQUAKE EXCITATIONS

  • 摘要: 在模态Pushover分析方法中,由模态推覆力得到的结构力-位移关系只适合于该模态下的反应,不能合理反映结构整体在地震作用下的弹塑性发展过程。为此,针对双向地震激励下的多层偏心结构,提出了两阶段多维Pushover分析方法。第一阶段:通过双向地震激励下的模态多维Pushover分析结构在双向地震下的位移反应;第二阶段:利用第一阶段得到的组合模态系数建立新的推覆力模式,进行第二次多维Pushover分析,分析结构的弹塑性发展过程。通过算例分析表明:1) 此方法能够较准确的估算结构位移沿楼层的分布特征;2) 随着塑性反应和楼层数的增加,估算偏差随之增大;3) 由组合模态推覆力模式的多维Pushover分析可以从整体上分析结构的弹塑性力-位移发展过程。

     

    Abstract: The nonlinear relationship between force and displacement of a structure obtained by modal pushover analysis is only suitable for the response of the corresponding structural mode, and it can not be used to analyze the elastic-plastic development process of the structure. Thus, for the asymmetric structures subjected to bi-directional earthquake excitations, a two-stage multi-dimensional pushover analysis procedure is presented. The first stage: the modal multi-dimensional pushover analysis procedure is used to obtain the responses of structures. The second stage: the new pushover load pattern is established according to combined structural modes and the second time multi-dimensional pushover analysis is implemented, in which the nonlinear force-displacement relationship of structures is analyzed. An example analysis shows that: 1) the procedure presented in the paper may be used as an effective method to estimate the distribution of deformation response along the structural floors. 2) With the increases of nonlinear responses and storey numbers, the deviations of estimation increase gradually. 3) The multi-dimensional pushover, based on the combined modal pushover load pattern, is suitable for analyzing the elastic-plastic development process of structures.

     

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