| 近断层地震动的频谱周期参数和非平稳特征分析 |
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| 引用本文： | 杨迪雄,王伟.近断层地震动的频谱周期参数和非平稳特征分析[J].地震工程与工程振动,2009,29(5). |
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| 作者姓名： | 杨迪雄 王伟 |
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| 作者单位： | 大连理工大学,工程力学系,工业装备结构分析国家重点实验室,辽宁,大连,116023 |
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| 基金项目： | 国家自然科学基金项目 |
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| 摘 要： | 分析地震动的频谱周期参数和频率非平稳特征,是地震危险性分析和结构抗震设计的重要内容.本文对近断层地震动记录按照不同的运动特征分组,进行了Hilbert-Huang变换分析.结合相关的定义得到了表征地震动频谱特性的7个周期参数,包括:Fourier幅值谱平均周期Tm、Hilbert边际谱平均周期Tmh、特征周期Tc、卓越周期等,并计算了地震动的Hilbert谱瞬时频率时程变异系数.计算结果表明,从整体上把握地震动频谱特性的三个周期参数Tm 、Tmh 和Tc适合于表征近断层地震动的频谱成份.近断层地震动的频率非平稳特征显著,Hilbert谱瞬时频率变异系数良好地反映了地震动的频率非平稳性质和程度.而且,考察了近断层地震动运动特征对地震动频谱周期参数和频率非平稳性的影响.
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| 关 键 词： | 近断层地震动 频谱周期参数 非平稳特征 Hilbert-Huang变换 Hilbert谱瞬时频率变异系数 |
Analysis of frequency content parameters and non-stationary characteristic of near-fault ground motions |
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| YANG Dixiong,WANG Wei.Analysis of frequency content parameters and non-stationary characteristic of near-fault ground motions[J].Earthquake Engineering and Engineering Vibration,2009,29(5). |
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| Authors: | YANG Dixiong WANG Wei |
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| Institution: | YANG Dixiong,WANG Wei(Department of Engineering Mechanics,Dalian University of Technology State Key Laboratory for Structural Analysis of Industrial Equipment,Dalian 116023,China) |
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| Abstract: | Analyzing the frequency content parameters and non-stationary property of earthquake ground motions is an important topic of seismic hazard assessment and structural seismic design.The near-fault ground motion recordings are divided into several groups according to their motion characteristics.Hilbert-Huang transform is implemented for these ground motions.Then,seven frequency content parameters of ground motions are obtained including the mean period of Fourier amplitude spectra Tm,mean period of Hilbert m... |
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| Keywords: | near-fault ground motions frequency content parameters non-stationary property Hilbert-Huang transform variance coefficients of instantaneous frequency of Hilbert spectra |
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