摘要
利用HHT方法定义了一种地震加速度记录的瞬时频率时程,该瞬时频率时程能够在一定程度上将原始加速度记录的频率非平稳特性予以量化。以此为依据,提出了一种根据地震加速度记录对场地液化进行识别的方法。通过分析实测的地震动加速度记录,参照实际的震害调查资料,并与现有其他方法的识别结果进行比较,验证了该方法的识别效果。
By the method of Hilbert-Huang transform （HHT）, this article defines an instantaneous frequency time history of seismic acceleration record, which can to some extent quantify the frequency-non-stationary characteristics of original acceleration record. Based on this kind of instantaneous frequency, this article proposes a detection method that can judge from the ground acceleration record whether the underground soil layers were liquefied or not during an earthquake event. By analyzing the measured acceleration recordings during past events, referring to the post-event damage investigation results, and comparing the detection results with those obtained by other methods, this article validates the detecting efficiency of the proposed method.
出处
《土木工程学报》
EI
CSCD
北大核心
2006年第2期66-72,77,共8页
China Civil Engineering Journal
基金
国家自然科学基金(50278090)
