基于Hilbert-Huang变换的建筑物强震记录分析方法研究

建筑物在强震中可能受到损伤,通过对结构瞬时频率的分析可以诊断出结构的损伤发展过程。本文探讨了基于H ilbert-Huang变换的结构物损伤诊断方法,研究了如何从结构地震响应信号中提取模态响应、1阶模态振型和损伤发展规律。本文采用HHT法分析了Northridge地震中某超高层建筑物的强震记录,分析结果表明:带有间歇检验准则的经验模态分解法能够提取结构的模态振动响应;通过分析不同楼层的相对H ilbert边际谱能够识别出结构的1阶模态振型;分析结构振动中瞬时频率的时变特点,可以直观地掌握振动中结构的损伤发展规律。

Analytical method study on structural strong motion database based on Hilbert-Huang transform

The trend of structural damage development caused by strong earthquakes can be detected by estimating the instantaneous frequency.In this paper,a new approach to diagnosing structural damage based on Hilbert-Huang transform is discussed,and the method of extracting the modal responses and the first mode shape and detecting the trend of damage development is studied. A high building's strong motion database in Northridge is analyzed with HHT method.The analytical results show that the model responses can be extracted by the empirical model decomposition technology with intermittency check criterion,and the first model shape can be identified by analyzing the relative Hilbert marginal spectra of various stories of building,and the trend of damage development can be understood and grasped by analyzing the instantaneous frequency.