基于HHT的结构强震记录分析研究  

Study on analysis of structural strong motion records based on HHT

作　　者：公茂盛[1] 谢礼立[1] 连海宁 戴君武[1] 

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080 [2]烟台地震监测中心台,山东烟台264000

出　　处：《地震工程与工程振动》2007年第6期24-29,共6页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50338040;50278029);国家科技支撑计划项目(2006BAC13B01);地震科学联合基金项目(606026);黑龙江省自然科学基金项目(E200607);中国地震局工程力学研究所基本科研业务专项项目(2006B02)

摘　　要：本文利用HHT(Hilbert-HUang Transform)研究了结构强震记录的时频特性及结构动力特性。介绍了一座7层钢混框架结构及其强震观测台阵概况以及经历的地震情况,选择了在3次有代表性地震中的强震记录,利用一种新的非平稳信号处理方法HHT对记录进行了处理和分析,得到了该结构强震记录的时频幅值三维分布以及边际谱,并将边际谱与傅里叶谱进行了对比,识别了结构的自振频率。研究表明,对结构强震记录这种强非平稳信号,可以利用HHT分析得到能量集中分布的频段与时间范围。HHT边际谱与傅里叶谱相比,在低频部分幅值要大于傅里叶谱,而在高频部分,幅值要小于傅里叶谱。利用结构强震记录识别的自振频率比环境振动测试结果要小。The time-frequency characteristics of structural strong motion records and the dynamic properties of a structure were studied by using a new non-stationary signal processing method HHT （Hilbert-Huang Transform） in the paper. A 7-story RC frame structure installed strong motion observation array and the earthquakes that the structure had experienced were introduced briefly. The structural strong motion records in 3 typical earthquakes were analyzed by the HHT method, and the time-frequency-amplitude and marginal spectra were obtained. Further, the marginal spectra of HHT were compared with Fourier spectra and the natural vibration frequencies of the structure were given. The study shows that the HHT method can be used to process the strong non-stationary signal such as structural strong motion records to obtain the energy concentrative time and the frequency area. It is also found that the marginal spectra are much greater than Fourier spectra in low frequency range but less than Fourier spectra in high frequency range. For a structure, the natural vibration frequencies identified from the strong motion records during earthquakes are much less than the results identified from the ambient vibration test.

关 键 词：HILBERT-HUANG变换 边际谱 结构强震记录 自振频率 时频分析 

分 类 号：P315.63[天文地球—地震学]