基于时变功率谱的非平稳加速度时程合成研究
|
摘要
加速度时程频率非平稳性对结构地震反应影响显著,工程中常用的拟合目标反应谱的时程合成法不能反映频率的非平稳性。为了得到强度和频率非平稳时程,采用多重滤波技术计算记录的时变功率谱,分析时变功率谱模型参数随震级、震中距及频率的变化规律并建立相应的衰减模型;利用衰减模型进行强度和频率非平稳加速度时程合成分析。通过对合成时程和强震记录时程的峰值加速度、强震持时及反应谱的对比分析,论证模型及合成方法的合理性和有效性。
The nonstationarity of acceleration time-frequency has significant impacts on seismic response of structure.The superposing technique of trigonometric function matching with the target spectrum does not reflect the nonstationarity in frequency.For synthesizing the nonstationary acceleration time histories in amplitude and frequency,the evolutionary power spectra is calculated by multi-filter technique,and the laws of evolutionary power spectra model parameters varied with magnitude,hypocentral distance and frequency of earthquake are analyzed and the attenuation equations are developed.By using the attenuation equations,the nonstationary acceleration time histories in amplitude and frequency are synthesized respectively.After comparing total energy,peak ground acceleration,duration and response spectra of synthetic acceleration time histories with recorded strong motions,the rationalities of attenuation equations and synthesized method are proved.
The nonstationarity of acceleration time-frequency has significant impacts on seismic response of structure.The superposing technique of trigonometric function matching with the target spectrum does not reflect the nonstationarity in frequency.For synthesizing the nonstationary acceleration time histories in amplitude and frequency,the evolutionary power spectra is calculated by multi-filter technique,and the laws of evolutionary power spectra model parameters varied with magnitude,hypocentral distance and frequency of earthquake are analyzed and the attenuation equations are developed.By using the attenuation equations,the nonstationary acceleration time histories in amplitude and frequency are synthesized respectively.After comparing total energy,peak ground acceleration,duration and response spectra of synthetic acceleration time histories with recorded strong motions,the rationalities of attenuation equations and synthesized method are proved.
引文
[1]Goupillaud P,Grossmann A,Morlet J.Cycle-octave and relatedtransforms in seismic signal analysis[J].Geoexploration.1984,23(1):85-102.
[2]Huang N E,Shen Z,Long S R,et al.The empirical mode decompo-sition and the Hilbert spectrum for nonlinear and non-stationarytime series analysis[C]//Proceeding of the Royal Society of London.1998.
[3]Goto H,Sugito M,Kameda H,Saito H,Ohtaki T.Prediction of non-stationary earthquake motions for moderate and Great earthquakeson rock surface[R].Annuals disaster prevention research institute.Kyoto University.1984,27(B-2):19-48.
[4]Sugito M,Furumoto Y,Sugiyama T.Strong motion prediction rocksurface by superposed evolutionary spectra[C]//Proceedings of the12th World Conference on Earthquake Engineering.Auckland,Febbraio,New Zealand.2000.
[5]Kameda H.Evolutionary spectra of seismogram by multifilter[J].Journal of Engineering Mechanism Division.American Society ofCivil Engineering.1975,101(EM6):787-801.
[6]马宗晋,杜品仁.现今地壳运动问题[M].北京:地震出版社,1995.
[7]马宗晋,张德成.板块构造基本问题[M].北京:地震出版社,1986.
[8]霍俊荣.近场强地面运动衰减规律的研究[D].北京:国家地震局工程力学研究所博士学位论文,1989.
[9]Berrill J B,Hanks T C.High frequency amplitude errors in digi-talized strong-motion accelerations[J].EERL.Q.Report.1974,Ⅳ:74-104.
[10]符圣聪,江静贝.用时变谱拟合地震动[J].工程抗震,2002(3):29-33.
[11]大崎顺彦著.吕敏申,谢礼立译.地震动谱分析入门[M].北京:地震出版社,1980.
[12]Campbell K W.Near-source attenuation of peak horizontal accel-eration[J].Bulletin of the Seismological Society of America.1981,71(6):2039-2070.
[13]俞言祥.长周期地震动衰减关系研究[D].北京:中国地震局地球物理研究所博士学位论文,2002.
[14]尹保江,黄宗明,白绍良.对地震地面运动持续时间定义的对比分析及改进建议[J].工程抗震,1999(2):43-46.
[2]Huang N E,Shen Z,Long S R,et al.The empirical mode decompo-sition and the Hilbert spectrum for nonlinear and non-stationarytime series analysis[C]//Proceeding of the Royal Society of London.1998.
[3]Goto H,Sugito M,Kameda H,Saito H,Ohtaki T.Prediction of non-stationary earthquake motions for moderate and Great earthquakeson rock surface[R].Annuals disaster prevention research institute.Kyoto University.1984,27(B-2):19-48.
[4]Sugito M,Furumoto Y,Sugiyama T.Strong motion prediction rocksurface by superposed evolutionary spectra[C]//Proceedings of the12th World Conference on Earthquake Engineering.Auckland,Febbraio,New Zealand.2000.
[5]Kameda H.Evolutionary spectra of seismogram by multifilter[J].Journal of Engineering Mechanism Division.American Society ofCivil Engineering.1975,101(EM6):787-801.
[6]马宗晋,杜品仁.现今地壳运动问题[M].北京:地震出版社,1995.
[7]马宗晋,张德成.板块构造基本问题[M].北京:地震出版社,1986.
[8]霍俊荣.近场强地面运动衰减规律的研究[D].北京:国家地震局工程力学研究所博士学位论文,1989.
[9]Berrill J B,Hanks T C.High frequency amplitude errors in digi-talized strong-motion accelerations[J].EERL.Q.Report.1974,Ⅳ:74-104.
[10]符圣聪,江静贝.用时变谱拟合地震动[J].工程抗震,2002(3):29-33.
[11]大崎顺彦著.吕敏申,谢礼立译.地震动谱分析入门[M].北京:地震出版社,1980.
[12]Campbell K W.Near-source attenuation of peak horizontal accel-eration[J].Bulletin of the Seismological Society of America.1981,71(6):2039-2070.
[13]俞言祥.长周期地震动衰减关系研究[D].北京:中国地震局地球物理研究所博士学位论文,2002.
[14]尹保江,黄宗明,白绍良.对地震地面运动持续时间定义的对比分析及改进建议[J].工程抗震,1999(2):43-46.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心