地震动强度指标与结构地震响应的相关性研究

李雪红 李晔暄 吴迪 徐秀丽 李枝军

振动与冲击 ›› 2014, Vol. 33 ›› Issue (23) : 184-189.

PDF(1717 KB)
PDF(1717 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (23) : 184-189.
论文

地震动强度指标与结构地震响应的相关性研究

  • 李雪红 李晔暄 吴迪 徐秀丽 李枝军
作者信息 +

Study on the correlation between the ground motion intensity and the structural seismic response

  • Li Xue-hong Li Ye-xuan Wu Di Xu Xiu-li Li Zhi-jun
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文章历史 +

摘要

目前结构抗震分析时使用的地震动强度指标较多,各种地震动强度指标的适用性尚未有统一的定论,缺乏系统的分析。采用考察结构最大地震响应与地震动强度指标之间的线性相关性的方法,选取具有代表性的100条原始地震动记录作为输入,基于不同周期的SDOF系统和实际减隔震桥梁,研究各地震动强度指标与结构地震响应的相关性。根据研究结果,将地震动强度指标划分为4类,其中以Sa(T1)为代表的第Ⅰ类强度指标与不同周期结构的相关程度都较高,而以PGA为代表的第Ⅱ类和以PGD为代表的第Ⅲ类强度指标分别对短周期和长周期结构的相关程度较高,以PGV为代表的第Ⅳ类强度指标相对较稳定,建议采用第Ⅰ类强度指标作为衡量地震动强度的指标参数。并通过工程实例进一步论证了对于自振周期已知的结构,地震动的不同强度指标与结构地震响应的相关性不同。

Abstract

Many ground motion intensity indexes were used to the structure seismic analysis, but there were no unified final conclusion and lack of systematically analysis on the applicability for these index. The correlation between the ground motion intensity and the structure seismic response was investigated by inputting 100 typical ground motion records to the SDOF system and the seismic-isolation-and-reduction continuous-beam bridge which have different period. The results show that the intensity index can be separated into four groups. The group I index represented by Sa(T1) has a high correlation with different period structure. The group II index represented by PGA has a high correlation with short period structure. The group III index represented by PGD has a high correlation with middle period structure. The group IV index represented by PGV has a stable correlation. The group I index is suggested to used as the ground motion intensity. A practical engineering analysis shows that different intensity indexes have different correlation with the known natural vibration period structure.

关键词

地震动强度指标 / 地震响应 / 相关性

Key words

ground motion intensity / seismic response / correlation

引用本文

导出引用
李雪红 李晔暄 吴迪 徐秀丽 李枝军 . 地震动强度指标与结构地震响应的相关性研究[J]. 振动与冲击, 2014, 33(23): 184-189
Li Xue-hong Li Ye-xuan Wu Di Xu Xiu-li Li Zhi-jun. Study on the correlation between the ground motion intensity and the structural seismic response [J]. Journal of Vibration and Shock, 2014, 33(23): 184-189

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