竖向与水平向地震动加速度反应谱比特性分析
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摘要
本文采用全球范围128次地震的3235组三分量强地面运动记录,分析了其加速度竖向分量反应谱与水平分量反应谱的比值(V/H)的总体特征,研究了V/H随震级、震中距、局部场地条件和震源机制的变化关系。研究结果表明:(1)场地越硬,长周期段V/H越大,短周期段则相反;(2)震级越大,长周期段V/H越大,短周期段变化不明显;(3)短周期段V/H随震中距增大而减小;(4)对于大震(M>7),长周期段V/H随震中距增大而减小;而对于中强震(M<7),比值在近场(R<60km)随震中距增加而增大,在远场则随震中距增加而减小;(5)V/H与震源机制也有一定的关系。
In this paper,3225 strong ground motion records from 128 earthquakes are used to calculate the ratios of the vertical to horizontal acceleration response spectra(V/H).The records are divided into groups according to site condition,epicentral distance,magnitude and focal mechanism.This study focuses on the relationship between V/H and these factors.The results show that:(1) the harder the site is,the larger the V/H in long-period range becomes,and the V/H in short-period range is opposite.(2) The greater the magnitude is,the higher the V/H in long-period range becomes,but the V/H in short period is not impressible.(3) The V/H in short period decreases as epicentral distance increases.(4) For great magnitude(M>7),the V/H in long-period range reduces as the epicentral distance increases.However,for great-moderate earthquakes(M<7),the ratio increases with the epicentral distance in near-field,and it reduces as the epicentral distance increases in far-field.(5) The V/H is also related to focal mechanism.
In this paper,3225 strong ground motion records from 128 earthquakes are used to calculate the ratios of the vertical to horizontal acceleration response spectra(V/H).The records are divided into groups according to site condition,epicentral distance,magnitude and focal mechanism.This study focuses on the relationship between V/H and these factors.The results show that:(1) the harder the site is,the larger the V/H in long-period range becomes,and the V/H in short-period range is opposite.(2) The greater the magnitude is,the higher the V/H in long-period range becomes,but the V/H in short period is not impressible.(3) The V/H in short period decreases as epicentral distance increases.(4) For great magnitude(M>7),the V/H in long-period range reduces as the epicentral distance increases.However,for great-moderate earthquakes(M<7),the ratio increases with the epicentral distance in near-field,and it reduces as the epicentral distance increases in far-field.(5) The V/H is also related to focal mechanism.
引文
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[5]Bozorgnia YM,Niazi M.Characteristics of free vertical ground motion during the Northridge earthquake[J].Earthquake Spectra,1995,11:515-525.
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[8]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.
[9]周正华,周雍年,卢滔,等.竖向地震动特征研究[J].地震工程与工程振动,2003,23(3):25-29.
[10]耿淑伟,陶夏新.地震动加速度反应谱竖向分量与水平分量的比值[J].地震工程与工程振动,2004,24(5):33-38.
[11]周锡元,徐平,王国权,等.1999年台湾集集地震近断层竖向与水平反应谱比值的研究[J].地震地质,2006,28(3):325-335.
[12]Atkinson G M,Cassidy F.Integrated use of seismograph and strong-motion data to determine soil amplification:Response of the Fraser RiverDelta to Duvall and Georgia Strait Earthquakes[J].Bulletin of the Seismdogical Society of America,2000,90(4):1028-1040.
[13]郭明珠,毛志清,魏秀丽,等.伽师强震群地震动特点与震源机制关系的研究[J].地震工程与工程振动,2002,22(1):28-31.
[14]李新乐,朱.考虑场地和震源机制的近断层地震动衰减特性的研究[J].工程地质学报,2004,12(2):141-147.
[15]贺秋梅,闫维明,董娣,等.震源机制和场地条件对近场强震地面运动特性的影响[J].地震研究,2006,29(3):256-263.
[16]俞言祥,胡聿贤,潘华.地震震源机制对长周期地震动的影响研究[J].岩石力学与工程学报,2005,24(17):3113-3118.
[17]董娣,桑向国,刘锐,等.震源机制对近场地震动反应谱的影响[J].西北地震学报,2008,30(1):6-10.
[2]Ohsaki C S.Analyses of seismic ground motion parameters including vertical components[C]//Proc.7WCEE,Istanbul:[s.n.],1980:269-276.
[3]Niazi M,Bozorgnia Y M.Behavior of near source peak vertical and horizontal ground motion over SMART-1 array,Taiwan[J].Bulletin of theSeismdogical Society of America,1991,85:715-732.
[4]Bozorgnia Y M,Niazi M.Distance scaling of vertical and horizontal response spectra of the Loma Prieta Earthquake[J].Earthquake Engineeringand Structural Dynamics,1993,22:695-707.
[5]Bozorgnia YM,Niazi M.Characteristics of free vertical ground motion during the Northridge earthquake[J].Earthquake Spectra,1995,11:515-525.
[6]Campbell K W.Empirical near-source attenuation relationships for horizontal and vertical components of peak ground acceleration,peak groundvelocity and pseudo-absolution response spectra[J].Seismological Research Letter,1997,68:154-179.
[7]周正华,周雍年,赵刚.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.
[8]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.
[9]周正华,周雍年,卢滔,等.竖向地震动特征研究[J].地震工程与工程振动,2003,23(3):25-29.
[10]耿淑伟,陶夏新.地震动加速度反应谱竖向分量与水平分量的比值[J].地震工程与工程振动,2004,24(5):33-38.
[11]周锡元,徐平,王国权,等.1999年台湾集集地震近断层竖向与水平反应谱比值的研究[J].地震地质,2006,28(3):325-335.
[12]Atkinson G M,Cassidy F.Integrated use of seismograph and strong-motion data to determine soil amplification:Response of the Fraser RiverDelta to Duvall and Georgia Strait Earthquakes[J].Bulletin of the Seismdogical Society of America,2000,90(4):1028-1040.
[13]郭明珠,毛志清,魏秀丽,等.伽师强震群地震动特点与震源机制关系的研究[J].地震工程与工程振动,2002,22(1):28-31.
[14]李新乐,朱.考虑场地和震源机制的近断层地震动衰减特性的研究[J].工程地质学报,2004,12(2):141-147.
[15]贺秋梅,闫维明,董娣,等.震源机制和场地条件对近场强震地面运动特性的影响[J].地震研究,2006,29(3):256-263.
[16]俞言祥,胡聿贤,潘华.地震震源机制对长周期地震动的影响研究[J].岩石力学与工程学报,2005,24(17):3113-3118.
[17]董娣,桑向国,刘锐,等.震源机制对近场地震动反应谱的影响[J].西北地震学报,2008,30(1):6-10.
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