双向地震激励下的两阶段多维Pushover分析

发布时间：2018-11-09 19:58

【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]:In the modal Pushover analysis method, the force-displacement relation of the structure obtained from the modal push-over force is only suitable for the response of the modal, and can not reasonably reflect the elastic-plastic development process of the whole structure under earthquake action. For this reason, a two-stage multi-dimensional Pushover analysis method is proposed for multi-layer eccentric structures under bidirectional seismic excitation. The first stage: the displacement response of the structure under the bidirectional earthquake is analyzed by the modal multi-dimensional Pushover under the bidirectional earthquake excitation. The second stage: by using the combined modal coefficients obtained in the first stage, a new push-force model is established, and the second multi-dimensional Pushover analysis is carried out to analyze the elastic-plastic development process of the structure. The numerical examples show that: 1) this method can accurately estimate the distribution characteristics of structural displacement along the floor, 2) with the increase of plastic response and the number of floors, the estimation deviation increases. 3) the development of elastic-plastic force-displacement of the structure can be analyzed by multi-dimensional Pushover analysis of the combined modal push-force mode.
【作者单位】：大连民族学院土木建筑工程学院;大连理工大学建设工程学部;
【基金】：国家自然科学基金项目(51108067,51478091) 国家自然科学创新研究团队基金项目(51121005)
【分类号】：TU311.3

【参考文献】