近场地震动速度脉冲周期的确定
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摘要
近场地震动中速度脉冲周期的确定受高频成分的影响具有很强的不确定性。为消除高频成分的影响,假设脉冲幅值恒等于地震动峰值速度,采用简化的脉冲数学模型对地震动速度时程进行最小二乘拟合,得到能够反映原速度时程中主脉冲特性的简化脉冲时程,对该简化脉冲时程应用"峰点法"确定其脉冲周期。最后,对该方法与国际通用的谱速度峰值法和Baker方法进行了比较。分析表明,该法与谱速度峰值法所得结果较为接近,个别情况下,其较后者更为有效。
One significant feature that distinguishes near-fault pulse-like ground motions from their counterparts is the presence of one or several dominant pulses typically observed in their velocity time histories.Due to the influence from high frequency contents,calculation of the pulse period involves great uncertainty.Under the assumption that pulse amplitude normally equals the peak ground velocity(PGV) and based on one simplified pulse model,the velocity pulse has been extracted from the original record by means of the least square fitting.Finally,determination of the pulse period is realized by the ‘peak point method',and efficiency of the proposed method is confirmed after comparing with two existing approaches.
One significant feature that distinguishes near-fault pulse-like ground motions from their counterparts is the presence of one or several dominant pulses typically observed in their velocity time histories.Due to the influence from high frequency contents,calculation of the pulse period involves great uncertainty.Under the assumption that pulse amplitude normally equals the peak ground velocity(PGV) and based on one simplified pulse model,the velocity pulse has been extracted from the original record by means of the least square fitting.Finally,determination of the pulse period is realized by the ‘peak point method',and efficiency of the proposed method is confirmed after comparing with two existing approaches.
引文
[1]Bertero V V,Mahin S A,Herrera R A.Aseismic designimplications of near-fautl San Fernando earthquake records[J].Earthquake Engineering and Structural Dynamics,1978,6(1):31-42
[2]Alavi B,Krawinkler H.Behavior of moment-resisting framestructures subjected to near-fault ground motions[J].Earthquake Engineering and Structural Dynamics,2004,33(6):687-706
[3]李爽,谢礼立.近场脉冲型地震动对钢筋混凝土框架结构影响[J].沈阳建筑大学学报:自然科学版,2006,22(3):406-410(Li Shuang,Xie Lili.Effects of near-fieldpulse-like ground motions on reinforced concrete framestructures[J].Journal of Shenyang Jianzhu University:Natural Science,2006,22(3):406-410(in Chinese))
[4]Luco N,Cornell C A.Structure-specific scalar intensitymeasures for near-source and ordinary earthquake groundmotions[J].Earthquake Spectra 2007,23(2):357-392
[5]谭平,谈忠坤,周福霖.近场地震动特性及其弹性与塑性谱的研究[J].华南地震,2008,28(2):1-9(TanPing,Tan Zhongkun,Zhou Fulin.Investigation oncharacteristics of near-field ground motion and its elasticand inelastic response spectra[J].South China Journal ofSeismology,2008,28(2):1-9(in Chinese))
[6]Sehhati R,Rodriguez-Marek A,ElGawady M,et al.Effectsof near-fault ground motions and equivalent pulses on multi-story structures[J].Engineering Structures,2011,33(3):767-779
[7]Somerville P G,Smith N F,Graves R W,et al.Modificationof empirical strong ground motion attenuation relations toinclude the amplitude and duration effects of rupturedirectivity[J].Seismological Research Letters,1997,68(1):199-222
[8]Mavroeidis G P,Papageorgiou A S.A mathematicalrepresentation of near-fault ground motions[J].Bulletin ofSeismological Society of America,2003,93(3):1099-1131
[9]Baker J W.Quantitative classification of near-fault groundmotions using wavelet analysis[J].Bulletin ofSeismological Society of America,2007,97(5):1486-1501
[10]大崎顺彦.地震动的谱分析入门[M].田琪,译.北京:地震出版社,2008
Dickinson B W,Gavin H P.Parametric statisticalgeneralization of uniform-hazard earthquake ground motions[J].Journal of Structural Engineering,2011,137(3):410-422
[2]Alavi B,Krawinkler H.Behavior of moment-resisting framestructures subjected to near-fault ground motions[J].Earthquake Engineering and Structural Dynamics,2004,33(6):687-706
[3]李爽,谢礼立.近场脉冲型地震动对钢筋混凝土框架结构影响[J].沈阳建筑大学学报:自然科学版,2006,22(3):406-410(Li Shuang,Xie Lili.Effects of near-fieldpulse-like ground motions on reinforced concrete framestructures[J].Journal of Shenyang Jianzhu University:Natural Science,2006,22(3):406-410(in Chinese))
[4]Luco N,Cornell C A.Structure-specific scalar intensitymeasures for near-source and ordinary earthquake groundmotions[J].Earthquake Spectra 2007,23(2):357-392
[5]谭平,谈忠坤,周福霖.近场地震动特性及其弹性与塑性谱的研究[J].华南地震,2008,28(2):1-9(TanPing,Tan Zhongkun,Zhou Fulin.Investigation oncharacteristics of near-field ground motion and its elasticand inelastic response spectra[J].South China Journal ofSeismology,2008,28(2):1-9(in Chinese))
[6]Sehhati R,Rodriguez-Marek A,ElGawady M,et al.Effectsof near-fault ground motions and equivalent pulses on multi-story structures[J].Engineering Structures,2011,33(3):767-779
[7]Somerville P G,Smith N F,Graves R W,et al.Modificationof empirical strong ground motion attenuation relations toinclude the amplitude and duration effects of rupturedirectivity[J].Seismological Research Letters,1997,68(1):199-222
[8]Mavroeidis G P,Papageorgiou A S.A mathematicalrepresentation of near-fault ground motions[J].Bulletin ofSeismological Society of America,2003,93(3):1099-1131
[9]Baker J W.Quantitative classification of near-fault groundmotions using wavelet analysis[J].Bulletin ofSeismological Society of America,2007,97(5):1486-1501
[10]大崎顺彦.地震动的谱分析入门[M].田琪,译.北京:地震出版社,2008
Dickinson B W,Gavin H P.Parametric statisticalgeneralization of uniform-hazard earthquake ground motions[J].Journal of Structural Engineering,2011,137(3):410-422
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