地震研究

利用HHT方法对6个台站的汶川8.0级地震加速度记录进行EMD分解,进而对地震波输入结构的总能量进行分解,得到地震动能量在IMF分量之间的分布关系。同时通过对各分量边际能量谱的分析,可以从另一方面得到地震波的频谱特性,边际能量谱峰值频率与地震波傅立叶谱的卓越频率相同,边际能量谱也可以作为一种估算震动卓越周期的方法。

Using the Hilbert-Huang Transform,acceleration time histories recorded by 6 stations in Wenchuan M8.0 earthquake are decomposed into several Intrinsic Mode Function components by Empirical Mode Decomposition.The total energy of structure inputted by seismic wave is decomposed to get the distribution relation of the ground motion energy in the different IMF component.By analysis of marginal energy spectrum of each IMF component,we can obtain the spectral characteristics of seismic wave.The frequency of marginal energy spectrum peak is the same as the predominant period of the Fourier spectrum of seismic wave,so it can also be used as the way to estimate the predominant period of vibration.

引言
1 基于希尔伯特–黄变换的汶川地震动分析
2 结论

表1 6个台站地震波的基本信息<br/>Tab.1 Basic imformations of seismic waves recorded by 6 stations

表1 6个台站地震波的基本信息
Tab.1 Basic imformations of seismic waves recorded by 6 stations

图1 卧龙台的加速度时程记录<br/>Fig.1 Acceleration time history recorded by Wolong Station

图1 卧龙台的加速度时程记录
Fig.1 Acceleration time history recorded by Wolong Station

表2 6个台站地震波的能量计算结果<br/>Tab.2 Energy spectrum calculation result of seismic waves recorded by 6 stations

表2 6个台站地震波的能量计算结果
Tab.2 Energy spectrum calculation result of seismic waves recorded by 6 stations

图2 卧龙台的加速度时程记录经EMD分解后的固有模态分量<br/>Fig.2 IMF components of acceleration time history decomposed by EMD recorded by Wolong Station

图2 卧龙台的加速度时程记录经EMD分解后的固有模态分量
Fig.2 IMF components of acceleration time history decomposed by EMD recorded by Wolong Station

图3 各分量能量和占原始地震波总能量百分比<br/>Fig.3 Percentage of energy spectrum of eachIMF component account for the total energy spectrum of original seismic wave

图3 各分量能量和占原始地震波总能量百分比
Fig.3 Percentage of energy spectrum of eachIMF component account for the total energy spectrum of original seismic wave

表3 各个台站地震波的能量谱分析及卓越周期<br/>Tab.3 Energy spectrum analysis and predominant periods of seismic waves recorded by 6 stations

表3 各个台站地震波的能量谱分析及卓越周期
Tab.3 Energy spectrum analysis and predominant periods of seismic waves recorded by 6 stations

图4 各分量能量谱峰值占原始地震波能量谱峰值的百分比<br/>Fig.4 Percentage of energy spectrum peak of each IMF component account for the total energy spectrum peak of original seismic wave

图4 各分量能量谱峰值占原始地震波能量谱峰值的百分比
Fig.4 Percentage of energy spectrum peak of each IMF component account for the total energy spectrum peak of original seismic wave

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备注

引言

1 基于希尔伯特–黄变换的汶川地震动分析

2 结论

期刊信息