【摘要】 利用希尔伯特-黄变换(HHT)研究古田地震中水口水电站重力坝强震反应台阵,强震反应观测资料的时频特性及重力坝结构动力特性表明:①强震记录能量集中在0～15 Hz频段和10～15 s时段;②坝顶重力坝强震反应相对坝基有2 s左右的滞后;③重力坝顺河向主频为3.7 Hz。通过强震观测记录HHT变换得到的边际谱、希尔伯特(Hilbert)能量谱和瞬时能量谱结构特征分析,初步了解强震记录的地震动特性和重力坝顺河向主频。更多还原

【Abstract】 By means of Hilbert-Huang Transform(HHT),the time frequency characteristic of observational data for strong motion as well as the structural dynamic characteristic of Shuikou Gravity Dam are studied,both of which are attained through the array of strong motion response in Gutian Earthquake.The results show that,(a) The energy of strong motion record for frequency is centralized between 0-15 Hz while the interval is between 10-15 s,(b) Compared with the dam base,the lag for the dam top of strong motion response is about 2 s,and(c) The concurrent dominant frequency for gravity dam is 3.7 Hz.Based on the structure characteristic analysis of marginal spectrum,Hilbert energy spectrum and instant energy spectrum transformed by the observational record HHT for strong motion,the earthquake motion characteristic for strong motion record and the concurrent dominant frequency for gravity dam are understood.更多还原