强震记录频率非平稳特性的若干研究
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摘要
本文将美国西部、中国台湾和其它地区在基岩场地上的156组地震记录按不同震级、震中距分组,分析了持续时间随震级、震中距的变化规律,在此基础上研究了强震记录的穿零率以及主频的时变特性,并用一直线来拟合穿零率随时间的变化规律,给出了此直线拟合参数在不同震中距、记录方向条件下的取值范围,以此来反映频率特性随时间变化的非平稳性,此外还通过运用峰点法在频率特性非平稳性中考虑涟波效应。所得结果与穿零率的相应结果进行了对比。文中的分析结果表明,穿零率方法是可以在一定程度上反映频率特性的非平稳性的。
According to the magnitude and the epicenter distance,this paper sorts 156 groups of earthquake bedrock recordings of the Western of US,Taiwan China,and other regions.Based on the data,we analyze the statistic features of duration along with the magnitude and epicenter distance,and study the time-variable characteristics of the crossing-zero rates and predominant frequency.We think that these can reflect the frequency non-stationary of strong ground motion.Then,we fit the crossing-zero-rate curve by a straight line,and give the fitting parameters of straight lines for different epicenter distance and different recording directions.In addition,we utilize the peak-point-interval method to analyze the frequency non-stationary to incorporate the effect of ripples and contrast the resulting with the corresponding resulting using the crossing zero method.The results of analyses and comparisons indicate that the crossing-zero rates can reflect the frequency non-stationary features to certain extent.
According to the magnitude and the epicenter distance,this paper sorts 156 groups of earthquake bedrock recordings of the Western of US,Taiwan China,and other regions.Based on the data,we analyze the statistic features of duration along with the magnitude and epicenter distance,and study the time-variable characteristics of the crossing-zero rates and predominant frequency.We think that these can reflect the frequency non-stationary of strong ground motion.Then,we fit the crossing-zero-rate curve by a straight line,and give the fitting parameters of straight lines for different epicenter distance and different recording directions.In addition,we utilize the peak-point-interval method to analyze the frequency non-stationary to incorporate the effect of ripples and contrast the resulting with the corresponding resulting using the crossing zero method.The results of analyses and comparisons indicate that the crossing-zero rates can reflect the frequency non-stationary features to certain extent.
引文
[1]Papad im itriou K,Beck J L.Stochastic characterization of ground motion and applications to structural response.Proc.of the 10thW orld Confer-ence on Earthquake Engineering[C].Madrid,Spain,1992.(2):835~844.
[2]李英民,杨溥.地震动频率非平稳特性对结构非线性响应的显著性影响分析[A].第五届全国地工程会议论文集[C].1998.(1):475~481.
[3]李英民.工程地震动的模型化研究[D].重庆:重庆建筑大学,1999.
[4]王国权,周锡元.台湾集集地震近断层强震地面运动加速度时程的随机特性[J].防灾减灾工程学报,2003,23(4):10~19.
[5]李英民,赖明,白绍良.三维地震动频率非平稳特性的相关性研究[J].重庆建筑大学学报2000,22(增刊):22~26.
[6]王国权,周锡元,马宗晋,等.921台湾地震近断层强地面运动的周期和幅值特性[J].工程抗震,2001,23(1):25~34.
[7]周正华,周雍年,卢滔,等.竖向地震动特性研究[J].地震工程与工程振动,2003,23(3):25~29.
[8]Husid R L.Analisis de Terremotos:Analisis General[J].Revista del ID1EM,1969,Santiago Ch ile,8(1):21~42.
[9]Trifunac M D,B rady A G.On the correlation of peak acceleration of strong motion w ith earthquake magn itude ep icentral d istance and site cond i-tion.Proc.US Nat.Conf.Earthquake Engineering[C].Ann Arbor,M ich igan.Earthquake Eng.Res.Inst.,1975.43~52.
[10]大崎顺彦著,吕敏申,谢礼立,译.地震动的谱分析入门[M].北京:地震出版社,1980.
[2]李英民,杨溥.地震动频率非平稳特性对结构非线性响应的显著性影响分析[A].第五届全国地工程会议论文集[C].1998.(1):475~481.
[3]李英民.工程地震动的模型化研究[D].重庆:重庆建筑大学,1999.
[4]王国权,周锡元.台湾集集地震近断层强震地面运动加速度时程的随机特性[J].防灾减灾工程学报,2003,23(4):10~19.
[5]李英民,赖明,白绍良.三维地震动频率非平稳特性的相关性研究[J].重庆建筑大学学报2000,22(增刊):22~26.
[6]王国权,周锡元,马宗晋,等.921台湾地震近断层强地面运动的周期和幅值特性[J].工程抗震,2001,23(1):25~34.
[7]周正华,周雍年,卢滔,等.竖向地震动特性研究[J].地震工程与工程振动,2003,23(3):25~29.
[8]Husid R L.Analisis de Terremotos:Analisis General[J].Revista del ID1EM,1969,Santiago Ch ile,8(1):21~42.
[9]Trifunac M D,B rady A G.On the correlation of peak acceleration of strong motion w ith earthquake magn itude ep icentral d istance and site cond i-tion.Proc.US Nat.Conf.Earthquake Engineering[C].Ann Arbor,M ich igan.Earthquake Eng.Res.Inst.,1975.43~52.
[10]大崎顺彦著,吕敏申,谢礼立,译.地震动的谱分析入门[M].北京:地震出版社,1980.
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