美国西部竖直向基岩强地面运动参数衰减关系研究
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摘要
利用美国NGA(Next Generation Attenuation)数据库提供的高质量数字强震数据,对美国西部地区自由地表基岩场地的竖直向地震动参数的衰减关系进行了研究,具体包括竖直向的峰值加速度PGA、峰值速度PGV及5%阻尼比绝对加速度反应谱(T=0.04~6.0 s)。将其与采用同样技术手段和同一套数据回归得到的水平向地震动参数衰减关系相结合,对模型化后的竖直向与水平向反应谱比V/H进行了计算,并对其随周期、震级、距离的变化关系进行了分析。新得到的竖直向地震动参数衰减关系的适用范围为Ms5.0~8.0,震中距0~200 km。
New attenuation relationships among vertical strong ground-motion parameters of rock sites in Western US were presented here,they were regressed using high-quality digital strong motion records from NGA( Next Generation Attenuation) database. The new attenuation relationships focused on vertical PGA( peak ground acceleration),PGV( peak ground velocity) and spectral acceleration( period from 0. 04 to 6. 0s) with 5% damping ratio. Ratio of vertical component to horizontal one of spectral acceleration was calculated with another attenuation relationship,it was regressed using the same regression procedure and strong-motion data. The characteristics how V / H ratio varied with period, magnitude and distance were studied here. The new vertical attenuation relationships were recommended to be used with surface wave magnitude ranged from 5. 0 to 8. 0,and epicenter distance ranged from 0 to 200 km.
New attenuation relationships among vertical strong ground-motion parameters of rock sites in Western US were presented here,they were regressed using high-quality digital strong motion records from NGA( Next Generation Attenuation) database. The new attenuation relationships focused on vertical PGA( peak ground acceleration),PGV( peak ground velocity) and spectral acceleration( period from 0. 04 to 6. 0s) with 5% damping ratio. Ratio of vertical component to horizontal one of spectral acceleration was calculated with another attenuation relationship,it was regressed using the same regression procedure and strong-motion data. The characteristics how V / H ratio varied with period, magnitude and distance were studied here. The new vertical attenuation relationships were recommended to be used with surface wave magnitude ranged from 5. 0 to 8. 0,and epicenter distance ranged from 0 to 200 km.
引文
[1]Campbell K W,Bozorgnia Y.Updated near-source groundmotion attenuation relations for the horizontal and vertical components of peak ground acceleration and acceleration response spectra[J].Seism.Soc.Am.,2003,93(1):314-331.
[2]Campbell K W,Bozorgnia Y.The vertical-to-horizontal response spectral ratio and tentative procedures for developing simplified V/H and vertical design spectra[J].Journal of Earthquake Engineering,2004,8(2):175-207.
[3]Tezcan J,Piolatto A.A probabilistic nonparametric model for the vertical-to-horizontal spectral ratio[J].Journal of Earthquake Engineering,2012,16(2):142-157.
[4]石树中,沈建文,楼梦麟.基岩场地强地面运动加速度反应谱统计特征[J].同济大学学报,2002,30(11):1300-1304.SHI Shu-zhong,SHEN Jian-wen,LOU Meng-lin.Statistic features of response spectra of acceleration strong ground motion at rock sites[J].Journal of Tongji University,2002,30(11):1300-1304.
[5]周正华,周雍年,卢滔,等.竖向地震动特征研究[J].地震工程与工程震动,2003,23(3):25-29.ZHOU Zheng-hua,ZHOU Yon-nian,LU Tao,et al.Study on characteristics of vertical ground motion[J].Journal of Earthquake Engineering and Engineering Vibration,2003,23(3):25-29.
[6]耿淑伟,陶夏新.地震动加速度反应谱竖向分量与水平向分量的比值[J].地震工程与工程震动,2004,24(5):33-38.GENG Shu-wei,TAO Xia-xin.The ratios of vertical to horizontal acceleration response spectra[J].Journal of Earthquake Engineering and Engineering Vibration,2004,24(3):33-38.
[7]徐龙军,谢礼立.竖向地震动加速度反应谱特征[J].地震工程与工程震动,2007,27(6):17-23.XU Long-jun,XIE Li-li.Chararcteristics of acceleration response spectra for vertical ground motions[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(6):17-23.
[8]韩建平,周伟.汶川地震竖向地震动特征初步分析[J].工程力学,2012,29(12):211-219.HAN Jian-ping,ZHOU Wei.Preliminary investigation on characteristics of vertical ground motion during wenchuan earthquan[J].Engineering Mechanics,2012,29(12):211-219.
[9]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,1989.
[10]肖亮.水平向基岩强地面运动参数衰减关系研究[D].北京:中国地震局地球物理研究所,2011.
[11]Power M,Chiou B,Abrahamson N,et al.An overview of the NGA Project[J].Earthquake Spectra,2008,24(1):3-22.
[12]Chiou B,Darragh R,Gregor N,et al.NGA Project strongmotion database[J].Earthquake Spectra,2008,24(1):23-44.
[13]肖亮,俞言祥.一种新的拟合地震动衰减关系的分步回归法[J].地震学报,2010,6:725-732.XIAO Liang,YU Yan-xiang.A new step-regression method for fitting ground motion attenuation relationship[J].Acta Seismologica Sinica,2010,6:725-732.
[2]Campbell K W,Bozorgnia Y.The vertical-to-horizontal response spectral ratio and tentative procedures for developing simplified V/H and vertical design spectra[J].Journal of Earthquake Engineering,2004,8(2):175-207.
[3]Tezcan J,Piolatto A.A probabilistic nonparametric model for the vertical-to-horizontal spectral ratio[J].Journal of Earthquake Engineering,2012,16(2):142-157.
[4]石树中,沈建文,楼梦麟.基岩场地强地面运动加速度反应谱统计特征[J].同济大学学报,2002,30(11):1300-1304.SHI Shu-zhong,SHEN Jian-wen,LOU Meng-lin.Statistic features of response spectra of acceleration strong ground motion at rock sites[J].Journal of Tongji University,2002,30(11):1300-1304.
[5]周正华,周雍年,卢滔,等.竖向地震动特征研究[J].地震工程与工程震动,2003,23(3):25-29.ZHOU Zheng-hua,ZHOU Yon-nian,LU Tao,et al.Study on characteristics of vertical ground motion[J].Journal of Earthquake Engineering and Engineering Vibration,2003,23(3):25-29.
[6]耿淑伟,陶夏新.地震动加速度反应谱竖向分量与水平向分量的比值[J].地震工程与工程震动,2004,24(5):33-38.GENG Shu-wei,TAO Xia-xin.The ratios of vertical to horizontal acceleration response spectra[J].Journal of Earthquake Engineering and Engineering Vibration,2004,24(3):33-38.
[7]徐龙军,谢礼立.竖向地震动加速度反应谱特征[J].地震工程与工程震动,2007,27(6):17-23.XU Long-jun,XIE Li-li.Chararcteristics of acceleration response spectra for vertical ground motions[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(6):17-23.
[8]韩建平,周伟.汶川地震竖向地震动特征初步分析[J].工程力学,2012,29(12):211-219.HAN Jian-ping,ZHOU Wei.Preliminary investigation on characteristics of vertical ground motion during wenchuan earthquan[J].Engineering Mechanics,2012,29(12):211-219.
[9]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,1989.
[10]肖亮.水平向基岩强地面运动参数衰减关系研究[D].北京:中国地震局地球物理研究所,2011.
[11]Power M,Chiou B,Abrahamson N,et al.An overview of the NGA Project[J].Earthquake Spectra,2008,24(1):3-22.
[12]Chiou B,Darragh R,Gregor N,et al.NGA Project strongmotion database[J].Earthquake Spectra,2008,24(1):23-44.
[13]肖亮,俞言祥.一种新的拟合地震动衰减关系的分步回归法[J].地震学报,2010,6:725-732.XIAO Liang,YU Yan-xiang.A new step-regression method for fitting ground motion attenuation relationship[J].Acta Seismologica Sinica,2010,6:725-732.