基于汶川8.0级强震记录的近场地震动特征分析
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摘要
在汶川8.0级大地震中,国家数字强震动台网布设在龙门山断裂带及其周围地区的50多个台站获得了大于100 Gal的加速度记录。选取其中断层附近11个台站的加速度记录,分别进行了地震反应谱分析和基于正交化HHT法的能量分布特征分析,通过对竖向与水平向加速度峰值比、竖向与水平向加速度反应谱比值,以及能量分布和峰值系数的分析与比较,探讨了汶川地震的近场地震动特征。
In the Longmenshan fault zone and surrounding area,more than 50 stations of China Strong Motion Net Center(CSMNC) got acceleration records,of which peak is bigger than 100gal in the 5.12 Wenchuan earthquake.In this paper,thirty-three near-fault ground motions from eleven stations were selected.The seismic response spectrum analysis and energy distribution analysis based on orthogonal HHT method were adopted to study the vertical to horizontal acceleration peak ratio,acceleration response spectral ratio,energy time-frequency distribution and peak coefficient.The results were compared and analyzed to discuss the characteristics of near-fault Ground Motions of M8.0 Wenchuan Earthquake.
In the Longmenshan fault zone and surrounding area,more than 50 stations of China Strong Motion Net Center(CSMNC) got acceleration records,of which peak is bigger than 100gal in the 5.12 Wenchuan earthquake.In this paper,thirty-three near-fault ground motions from eleven stations were selected.The seismic response spectrum analysis and energy distribution analysis based on orthogonal HHT method were adopted to study the vertical to horizontal acceleration peak ratio,acceleration response spectral ratio,energy time-frequency distribution and peak coefficient.The results were compared and analyzed to discuss the characteristics of near-fault Ground Motions of M8.0 Wenchuan Earthquake.
引文
[1]李小军,周正华,于海英,等.汶川8.0级地震强震动观测及记录初步分析[C]//汶川地震建筑震害分析与重建研讨会.北京:中国工程院土木、水利与建筑工程学部,2008.
[2]徐扬,赵晋泉,李小军,等.基于汶川地震远场强震动记录的厚覆盖土层对长周期地震动影响分析[J].震灾防御技术,2008,3(4):345-351.
[3]周正华,温瑞智,卢大伟,等.汶川地震中强震动台基墩引起的记录异常分析[J].应用基础与工程科学学报,2010,18(2):304-312.
[4]刘启芳,袁一凡.近断层地震动的基本特征[J].地震工程与工程振动,2006,6(1):1-10.
[5]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局GB5011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[6]Huang N E,Zheng Shen,Steven R.Long,et al.The empiricalmode decomposition and Hilbert spectrum for nonlinear and non-stationary time series analysis[J].Mathematical,Physical andEngineering Sciences,1998,454:903-995.
[7]楼梦麟,黄天立.正交化经验模式分解方法[J].同济大学学报:自然科学版,2007,35(3):293-298.
[8]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[9]周正华,周雍年.强震近场加速度峰值比和反应谱统计分析[J].地震工程与工程振动,2002,22(3):15-18.
[10]胡灿阳,陈清军.非平稳地震地面运动局部谱密度的正交化HHT估计[J].同济大学学报:自然科学版,2008,36(9):1164-1169.
[11]刘强,周瑞忠,刘宇航.基于Hilbert-Huang变换分析的地震动能量与震动效应评估[J].力学与实践,2008,30(5):19-23.
[2]徐扬,赵晋泉,李小军,等.基于汶川地震远场强震动记录的厚覆盖土层对长周期地震动影响分析[J].震灾防御技术,2008,3(4):345-351.
[3]周正华,温瑞智,卢大伟,等.汶川地震中强震动台基墩引起的记录异常分析[J].应用基础与工程科学学报,2010,18(2):304-312.
[4]刘启芳,袁一凡.近断层地震动的基本特征[J].地震工程与工程振动,2006,6(1):1-10.
[5]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局GB5011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[6]Huang N E,Zheng Shen,Steven R.Long,et al.The empiricalmode decomposition and Hilbert spectrum for nonlinear and non-stationary time series analysis[J].Mathematical,Physical andEngineering Sciences,1998,454:903-995.
[7]楼梦麟,黄天立.正交化经验模式分解方法[J].同济大学学报:自然科学版,2007,35(3):293-298.
[8]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[9]周正华,周雍年.强震近场加速度峰值比和反应谱统计分析[J].地震工程与工程振动,2002,22(3):15-18.
[10]胡灿阳,陈清军.非平稳地震地面运动局部谱密度的正交化HHT估计[J].同济大学学报:自然科学版,2008,36(9):1164-1169.
[11]刘强,周瑞忠,刘宇航.基于Hilbert-Huang变换分析的地震动能量与震动效应评估[J].力学与实践,2008,30(5):19-23.
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