汶川余震加速度记录的反应谱特征研究
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摘要
利用584组汶川余震Ⅱ类场地加速度记录,研究震级、震中距对水平向反应谱形状的影响以及竖向反应谱与水平向反应谱的差异。研究表明:①震中距较大时,幅值相同的水平地震动反应谱形状受震级影响较大,震级越大,反应谱峰值越小,峰值周期越大;②竖向与水平向反应谱平均比值V/H与震级相关,V/H值随震级增大有增大趋势,规范中V/H取值应考虑震级影响;③震级较大且距震中较远时,竖向与水平向反应谱平均比值V/H在长周期段大于规范规定值2/3,离震中越远,V/H值越大。
With 584 groups of acceleration records from Wenchuan aftershock,the effects of magnitude and epicenter distance(D) on the spectrum shape of horizontal and vertical ground motion was studied,and the differences between the horizontal and vertical ones was also made.The results show:①when D is relatively large,the effect of Magnitude(Ms) on the spectrum shape of horizontal ground motion with same peak value is deeper.The lager the magnitude is,the smaller the peak value of response spectrum and the larger the spectral characteristic period is;②mean vertical-to-horizontal spectral ratio(V/H) is affected by Ms.Ms tends to increases with V/H increasing,which specified that the effect of Ms on V/H should be considered in code;③when Ms and D are relatively large,V/H overrides 2/3,V/H increases with D increasing.
With 584 groups of acceleration records from Wenchuan aftershock,the effects of magnitude and epicenter distance(D) on the spectrum shape of horizontal and vertical ground motion was studied,and the differences between the horizontal and vertical ones was also made.The results show:①when D is relatively large,the effect of Magnitude(Ms) on the spectrum shape of horizontal ground motion with same peak value is deeper.The lager the magnitude is,the smaller the peak value of response spectrum and the larger the spectral characteristic period is;②mean vertical-to-horizontal spectral ratio(V/H) is affected by Ms.Ms tends to increases with V/H increasing,which specified that the effect of Ms on V/H should be considered in code;③when Ms and D are relatively large,V/H overrides 2/3,V/H increases with D increasing.
引文
[1]GB 50011—2001建筑结构抗震规范[S.]北京:中国建筑工业出版社,2008
[2]Kuribayashi,et al.Effects of seismic and subsoil conditionon earthquake response spectra[C/]/Proc.Int.Conf.onMicrozonation,1972
[3]周雍年.震级、断层距和场地条件对地面运动反应谱的影响[J].地震工程与工程振动,1984,4(4):14-21(The effects of the seismic magnitudes,the epicentraldistances and local soil conditions on the response spectra[J.]Earthquake Engineering and Engineering Vibration,1984,4(4):14-21(in Chinese))
[4]周锡元,齐微,徐平,等.震级、震中距和场地条件对反应谱特性影响的统计分析[J].北京工业大学学报,2006,32(2):97-103(Zhou Xiyuan,Qi Wei,Xu Ping,et al.Statistical analysis on the influence of magnitude,distanceand site condition on response spectra[J.]Journal ofBeijing University of Technology,2006,32(2):97-103(inChinese))
[5]李新乐,朱晞.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):141-148(Li Xinle,Zhu Xi.Attenuation characteristics ofnear-fault ground motions based on site and forcalmechanism[J.]Journal of Engineering Geology,2004,12(2):141-148(in Chinese))
[6]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(He Qiumei,Yan Weiming,Dong Di,et al.Effects of focal mechanism and site condition on groundmotion characteristics of strong earthquakes in near field[J.]Journal of Seismological Research,2006,29(3:)256-263(in Chinese))
[7]董娣,桑向国,刘锐,等.震源机制对近场地震动反应杨永强(1983-),男,博士研究生。主要从事地震工程研究。谢礼立(1938-),男,学士,研究员。主要从事地震工程与防灾工程研究。李明(1979-),男,博士,讲师。主要从事工程抗震研究。于海英(1962-),男,学士,研究员。主要从事强震数据处理研究。谱的影响[J].西北地震学报,2008,30(1):6-10(Dong Di,Sang Xiangguo,Liu Rui,et al.Effects of focal mechanismon near field response spectrum of ground motion[J].Northwestern Seismological Journal,2008,30(1):6-10(inChinese))
[8]Uniform Building Code.International conference of buildingofficia[lS].Whittier,1997
[9]Eurocode 8,Design provisions for earthquake resistance ofstructure[S].ENV 1998-1,CEN,Brussels,1994
[2]Kuribayashi,et al.Effects of seismic and subsoil conditionon earthquake response spectra[C/]/Proc.Int.Conf.onMicrozonation,1972
[3]周雍年.震级、断层距和场地条件对地面运动反应谱的影响[J].地震工程与工程振动,1984,4(4):14-21(The effects of the seismic magnitudes,the epicentraldistances and local soil conditions on the response spectra[J.]Earthquake Engineering and Engineering Vibration,1984,4(4):14-21(in Chinese))
[4]周锡元,齐微,徐平,等.震级、震中距和场地条件对反应谱特性影响的统计分析[J].北京工业大学学报,2006,32(2):97-103(Zhou Xiyuan,Qi Wei,Xu Ping,et al.Statistical analysis on the influence of magnitude,distanceand site condition on response spectra[J.]Journal ofBeijing University of Technology,2006,32(2):97-103(inChinese))
[5]李新乐,朱晞.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):141-148(Li Xinle,Zhu Xi.Attenuation characteristics ofnear-fault ground motions based on site and forcalmechanism[J.]Journal of Engineering Geology,2004,12(2):141-148(in Chinese))
[6]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(He Qiumei,Yan Weiming,Dong Di,et al.Effects of focal mechanism and site condition on groundmotion characteristics of strong earthquakes in near field[J.]Journal of Seismological Research,2006,29(3:)256-263(in Chinese))
[7]董娣,桑向国,刘锐,等.震源机制对近场地震动反应杨永强(1983-),男,博士研究生。主要从事地震工程研究。谢礼立(1938-),男,学士,研究员。主要从事地震工程与防灾工程研究。李明(1979-),男,博士,讲师。主要从事工程抗震研究。于海英(1962-),男,学士,研究员。主要从事强震数据处理研究。谱的影响[J].西北地震学报,2008,30(1):6-10(Dong Di,Sang Xiangguo,Liu Rui,et al.Effects of focal mechanismon near field response spectrum of ground motion[J].Northwestern Seismological Journal,2008,30(1):6-10(inChinese))
[8]Uniform Building Code.International conference of buildingofficia[lS].Whittier,1997
[9]Eurocode 8,Design provisions for earthquake resistance ofstructure[S].ENV 1998-1,CEN,Brussels,1994
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