加速度时程包络函数地区性差异初步研究
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摘要
已有研究表明,不同地震活动强度地区的地震动峰值加速度及反应谱衰减规律有明显差异。对比分析了不同地震活动强度地区的加速度时程包络函数衰减规律是否同样存在差异。美国西部位于环太平洋地震带,地震活动的强度和频度都很高,属强地震活动区。而欧洲相对于美国西部,地震活动稍弱,属中、强地震活动区。根据加速度时程的完整程度,从NGA强震数据库中筛选出1429条美国西部强震记录和131条欧洲强震记录。在考虑场地条件时,将地表30m内等效剪切波速引入衰减模型来表征场地条件。应用最小二乘法,分别确定了美国西部和欧洲地震动加速度时程包络函数衰减关系,并进行了对比。结果显示,不同地震活动强度的地区,其包络函数确实存在差异。最后,分析了除地区性差异外,影响结果的其它因素。
Previous studies indicate that,there are some obvious divergences between the attenuation relationships for PGA or response spectrum in different areas which have different earthquake activities. In this paper,we analyzed whether there is some divergences between the attenuation laws for the envelope functions of acceleration time histories in different earthquake activities areas. Western US locates in Circum- Pacific seismic belt. The intensity and the frequence of the earthquake in western US are relatively high. It is a high seismic active region. However,the earthquake activity in Europe is lower than that in western US. Europe is a moderate seismicity region. Based on the integrity of the acceleration time history,we chose 1429 records in western US and 131 records in Europe from NGA strong motion database. The equivalent shear wave velocity of ground within 30 m from surfac was introduced into the attenuation model to consider the effect of site condition. Using the least square method,we obtain the attenuation laws of the envelope functions in the two regions,and compare them each other. The result reveals that,there are surely divergences between the envelope functions in different seismicity regions. In the end,other factors influencing the result of this paper were discussed.
Previous studies indicate that,there are some obvious divergences between the attenuation relationships for PGA or response spectrum in different areas which have different earthquake activities. In this paper,we analyzed whether there is some divergences between the attenuation laws for the envelope functions of acceleration time histories in different earthquake activities areas. Western US locates in Circum- Pacific seismic belt. The intensity and the frequence of the earthquake in western US are relatively high. It is a high seismic active region. However,the earthquake activity in Europe is lower than that in western US. Europe is a moderate seismicity region. Based on the integrity of the acceleration time history,we chose 1429 records in western US and 131 records in Europe from NGA strong motion database. The equivalent shear wave velocity of ground within 30 m from surfac was introduced into the attenuation model to consider the effect of site condition. Using the least square method,we obtain the attenuation laws of the envelope functions in the two regions,and compare them each other. The result reveals that,there are surely divergences between the envelope functions in different seismicity regions. In the end,other factors influencing the result of this paper were discussed.
引文
[1]霍俊荣.近场强地面运动衰减规律的研究[D].哈尔滨:国家地震局工程力学研究所,1989.HUO Junrong.Study on the attenuation laws of strong earthquake ground motion near the source[D].Haerbin:Institute of Engineering Mechanics,China Earthquake Administration,1989.
[2]霍俊荣,胡聿贤,冯启民.地面运动时程强度包络函数的研究[J].地震工程与工程振动,1991,11(1):1-12.HUO Junrong,HU Yuxian,FENG Qimin.Study on envelope function of acceleration time history[J].Earthquake Engineering and Engineering Vibration,2008,11(1):1-12.
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[5]俞言祥,李山有,肖亮.为新区划图编制所建立的地震动衰减关系[J].震灾防御技术,2013,8(1),24-33.YU Yanxiang,LI Shanyou,XIAO Liang.Development of ground motion attenuation relations for the new seismic hazard map of China[J].Technology for Earthquake Disaster Prevention,2013,8(1),24-33.
[6]Boore David,Atkinson Gail.Boore-Atkinson NGA Ground Motion Relations For The Geometric Mean Horizontal Component Of Peak And Spectral Ground Motion Parameters[C]//PEER Report.California:Pacific Earthquake Engineering Research Center,2007.
[7]Abrahamson Norman,Silva Walter.Abrahamson&Silva NGA Ground Motion Relations for the Geometric Mean Horizontal Component of Peak and Spectral Ground Motion Parameters[C]//PEER Report.California:Pacific Earthquake Engineering Research Center,2007.
[8]Campbell Kenneth,Bozorgnia Yousef.Campbell-Bozorgnia NGA Ground Motion Relations for the Geometric Mean Horizontal Component of Peak and Spectral Ground Motion Parameters[C]//PEER Report.California:Pacific Earthquake Engineering Research Center,2007.
[9]Chiou Brian,Youngs Robert.Chiou and Youngs PEER-NGA Empirical Ground Motion Model for the Average Horizontal Component of Peak Acceleration and Pseudo-Spectral Acceleration for Spectral Periods of 0.01 to 10 Seconds[C]//Interim Report for USGS Review.California:Pacific Earthquake Engineering Research Center,2006.
[10]Idirss.Empirical model for estimating the average horizontal values of pseudo-absolute spectral accelerations generated by crustal earthquakes[C]//IMI-NGA Interim Report.California:Pacific Earthquake Engineering Research Center,2007.
[2]霍俊荣,胡聿贤,冯启民.地面运动时程强度包络函数的研究[J].地震工程与工程振动,1991,11(1):1-12.HUO Junrong,HU Yuxian,FENG Qimin.Study on envelope function of acceleration time history[J].Earthquake Engineering and Engineering Vibration,2008,11(1):1-12.
[3]靳超宇,俞言祥.欧洲中小震基岩水平向地震动衰减关系研究[J].中国地震,2009,25(2):170-177.JIN Chaoyu,YU Yanxiang.Attenuation relationships for horizontal ground motion on rock of small-moderate earthquakes in Europe[J].Earthquake Research in China,2009,25(2):170-177.
[4]王继,俞言祥.华中、华南中强地震区地震烈度衰减关系研究[J].震灾防御技术,2008,3(1):20-25.WANG Ji,YU Yanxiang.Seismic intensity attenuation law in moderate intense seismic zone of central and southern China[J].Technology for Earthquake Disaster Prevention,2008,3(1):20-25.
[5]俞言祥,李山有,肖亮.为新区划图编制所建立的地震动衰减关系[J].震灾防御技术,2013,8(1),24-33.YU Yanxiang,LI Shanyou,XIAO Liang.Development of ground motion attenuation relations for the new seismic hazard map of China[J].Technology for Earthquake Disaster Prevention,2013,8(1),24-33.
[6]Boore David,Atkinson Gail.Boore-Atkinson NGA Ground Motion Relations For The Geometric Mean Horizontal Component Of Peak And Spectral Ground Motion Parameters[C]//PEER Report.California:Pacific Earthquake Engineering Research Center,2007.
[7]Abrahamson Norman,Silva Walter.Abrahamson&Silva NGA Ground Motion Relations for the Geometric Mean Horizontal Component of Peak and Spectral Ground Motion Parameters[C]//PEER Report.California:Pacific Earthquake Engineering Research Center,2007.
[8]Campbell Kenneth,Bozorgnia Yousef.Campbell-Bozorgnia NGA Ground Motion Relations for the Geometric Mean Horizontal Component of Peak and Spectral Ground Motion Parameters[C]//PEER Report.California:Pacific Earthquake Engineering Research Center,2007.
[9]Chiou Brian,Youngs Robert.Chiou and Youngs PEER-NGA Empirical Ground Motion Model for the Average Horizontal Component of Peak Acceleration and Pseudo-Spectral Acceleration for Spectral Periods of 0.01 to 10 Seconds[C]//Interim Report for USGS Review.California:Pacific Earthquake Engineering Research Center,2006.
[10]Idirss.Empirical model for estimating the average horizontal values of pseudo-absolute spectral accelerations generated by crustal earthquakes[C]//IMI-NGA Interim Report.California:Pacific Earthquake Engineering Research Center,2007.
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