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论文类型： 期刊论文

发表时间： 2022-06-29

发表刊物： 建筑结构学报

期号： 9

页面范围： 43-52

ISSN号： 1002-848X

摘要： To simplify the algorithm of multi-mode Pushover analysis based on energy balance, two modified methods were proposed to take into account the higher mode effects and calculation efficiency. One was the combination method in which solution of Pushover analysis and higher-order elastic solutions were combined in modal analysis. The other was the envelope method in which the envelope of Pushover response and all the elastic responses from modal analysis was considered. Responses of 9-story and 20-story plan-asymmetric frame structures under typical earthquake loads were calculated by using these two methods separately. Comparisons were completed among the results of nonlinear time history analysis, Pushover analysis based on energy balance with basic mode only and the modified methods proposed here. It is shown that the higher mode effects on seismic response are estimated well by using the proposed methods. Both combination method and envelope method can get a reasonable prediction of responses at mass centers of torsionally-stiff and torsionally-flexible models, and the envelope method predicts the response of the stiff boundary better while the combination method predicts the response of the flexible boundary better. It is also found that the underlying response of combination method is generally higher than response of envelope method. Both of the two methods can get a better prediction of responses of 9-story structure than that of 20-story structure. © 2016, Editorial Office of Journal of Building Structures. All right reserved.

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