基于日本9.0级地震的远场地震动长周期特性研究  

Study on long period characteristics of far-field ground motion based on Japan 9.0 magnitude earthquake

作　　者：陈立栋[1] 孙逊[1] 

机构地区：[1]东南大学土木工程学院,江苏南京210096

出　　处：《工程建设》2016年第2期1-6,15,共7页Engineering Construction

摘　　要：基于日本防灾科技研究所(NIED)在2011年3月11日东日本Mw 9.0级大地震中收集到的地震记录,通过对地震动时频参数的回归分析,进行了远场地震动长周期特性研究。分析结果表明,随着传播距离的增大,地震动持续时间并未衰减,而是表现出增大的趋势;特征周期Tp和平均周期Tm均表现出明显的增大趋势;相比于峰值加速度PGA的快速衰减,峰值位移PGD衰减相对较慢。结果证明大震级地震下的远场地震动具有持续时间长,强度低而位移相对较大的特点,表现出明显的长周期特性。Based on the earthquake records collected by National Research Institute for Earth Science and Dis- aster Prevention （NIED） in Eastern Japan 9. 0 magnitude earthquake occurring on Mar 11 of year 2011, through re- gression analysis of time-frequency parameters of the ground motion, the study on long period characteristics of the far-field ground motion was carried out. The analysis result shows that, with the increase of spreading distance, the ground motion duration does not deteriorate but indicates an increasing trend; The characteristic period Tp and the av- erage period Tm all indicate an increasing trend; Compared with the quick decline of the peak ground acceleration （PGA）, the peak ground displacement （PGD） deteriorates slowly. The result proves that, the far-filed ground mo- tion under large magnitude earthquake has such characteristics as long duration, low intensity and relative large dis- placement, showing obvious long period characteristics.

关 键 词：远场地震动 长周期 时域分析 频域分析 频谱周期 

分 类 号：TU318.1[建筑科学—结构工程]