集集地震多维地震动频域非平稳特性分析  

The Frequency Non-stationary Characteristic Study on Multidimensional Ground Motion of Chi-Chi Earthquake

作　　者：陈辉国[1,2] 李英民[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]后勤工程学院军事建筑工程系,重庆401311

出　　处：《后勤工程学院学报》2011年第3期1-7,共7页Journal of Logistical Engineering University

基　　金：国家自然科学基金资助项目(90815011)

摘　　要：基于HHT方法和集集地震实际地震记录,利用可表征地震动频域非平稳特性的瞬时频率时程和瞬时幅值时程,对集集地震多维地震动的频域非平稳分布特性、场地条件及震中距对非平稳特性的影响进行了分析。分析结果表明,瞬时频率方法在地震动频域非平稳特性的定量描述上较穿零率方法更为精确,可较好地反映多维地震动的频域非平稳特性。Based on the HHT method and Chi-Chi earthquake records,the frequency non-stationary distribution characteristic and its influence degree under different site condition and epicenter distance of the multidimensional ground motion are analyzed by using instantaneous frequency and amplitude time history.The conclusion indicates that the instantaneous frequency method is more accurate than the crossing zero method in description of the frequency characteristic of ground motion,and can reflect the multidimensional ground motion frequency non-stationary features to some extent.

关 键 词：多维地震动 频率非平稳 瞬时频率时程 

分 类 号：TU318[建筑科学—结构工程]