山东地区地震动峰值加速度场地效应的定量分析
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摘要
地震动峰值加速度场地效应研究在地震区划、地震预警及震害快速评估等方面有着广泛的应用前景。收集整理了2004—2012年山东地区2630个地震安全性评价工程的相关资料,包括场地类型、覆盖层厚度、钻孔剪切波速、自由基岩和土层表面地震动峰值加速度计算结果。利用上述资料计算得到了每个工程场地的场地效应放大因子和场地指数;采用回归分析方法,对场地效应放大因子与基岩峰值加速度、场地指数之间的关系进行了研究并得出了三者之间的定量统计表达式,实现了场地效应放大因子的连续取值。结果表明,场地效应放大因子与基岩峰值加速度之间为线性负相关,与场地指数之间为非线性相关。
Site effect on seismic peak ground acceleration is widely considered in such fields as seismic ground motion parameter zonation,earthquake early warning and quick assessment of seismic damage losses. Documents on seismic safety evaluation of engineering sites,including site type,overburden thickness,shear wave velocity,calculated seismic peak ground accelerations on both rock and soil surface for 2 630 engineering sites in Shandong Province have been collected in this paper. On the basis of these data,site amplification factor and site index for each site have been calculated. The site index is an integrated index to characterize the site condition and is computed from the shear wave velocity,density and thickness of the cover layers. Its values may change from 0 to 1. With the method of regression analysis,the relations among the site amplification factor,peak acceleration of bedrock and the site index are studied. A quantitative statistical relation between site amplification factor and other parameters is achieved. The site amplification factor in this paper is expressed as functions of peak acceleration of bedrock and site index,thus,its value may change continuously with the changing of the other parameters. The statistical relation for the site amplification factor in this paper is acquired on the basis of numerous,widely distributed data in Shandong Province,especially,site conditions can be represented in detail with site index. Therefore,the acquired statistical relation could characterize the changing scenarios of the site amplification factor with both the peak acceleration of the rock surface and the site condition details. The results show that the site amplification factor is negatively linearly related with the rock surface seismic peak ground acceleration and nonlinearly related with the site index.
Site effect on seismic peak ground acceleration is widely considered in such fields as seismic ground motion parameter zonation,earthquake early warning and quick assessment of seismic damage losses. Documents on seismic safety evaluation of engineering sites,including site type,overburden thickness,shear wave velocity,calculated seismic peak ground accelerations on both rock and soil surface for 2 630 engineering sites in Shandong Province have been collected in this paper. On the basis of these data,site amplification factor and site index for each site have been calculated. The site index is an integrated index to characterize the site condition and is computed from the shear wave velocity,density and thickness of the cover layers. Its values may change from 0 to 1. With the method of regression analysis,the relations among the site amplification factor,peak acceleration of bedrock and the site index are studied. A quantitative statistical relation between site amplification factor and other parameters is achieved. The site amplification factor in this paper is expressed as functions of peak acceleration of bedrock and site index,thus,its value may change continuously with the changing of the other parameters. The statistical relation for the site amplification factor in this paper is acquired on the basis of numerous,widely distributed data in Shandong Province,especially,site conditions can be represented in detail with site index. Therefore,the acquired statistical relation could characterize the changing scenarios of the site amplification factor with both the peak acceleration of the rock surface and the site condition details. The results show that the site amplification factor is negatively linearly related with the rock surface seismic peak ground acceleration and nonlinearly related with the site index.
引文
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吕红山,赵凤新.2007.适用于中国场地分类的地震动反应谱放大系数[J].地震学报,29(1):67—76.LHong-shan,Zhao Feng-xin.2007.Site coefficients suitable to China site category[J].Acta Seismologica Sinica,29(1):67—76(in Chinese).
吕悦军,彭艳菊,施春花,等.2011.北京地区中硬场地地震动效应研究[J].防震减灾工程学报,31(5):523—528.LYue-jun,PENG Yan-ju,SHI Chun-hua,et al.2011.A study on seismic effect of medium-stiff soil site in Beijingarea[J].Journal of Disaster Prevention and Mitigation Engineering,31(5):523—528(in Chinese).
薛俊伟,刘伟庆,王曙光,等.2013.基于场地效应的地震动特性研究[J].地震工程与工程振动,33(1):16—23.XUE Jun-wei,LIU Wei-qing,WANG Shu-guang,et al.2013.Research on ground motion characteristics considering siteconditions[J].Journal of Earthquake Engineering and Engineering Vibration,33(1):16—23(in Chinese).
中国地震动参数区划图编图组,国家质量技术监督局.2001.GB18306-2001中国地震动参数区划图[S].北京:中国标准出版社.Compilation Committee of‘Seismic Ground Motion Parameter Zonation Map’,General Administration of QualitySupervision,Inspection and Quarantine of the People's Republic of China.2001.GB18306-2001:SeismicGround Motion Parameter Zonation Map of China[S].China Standards Press,Beijing(in Chinese)
Building Seismic Safety Council.2004.NEHRP Recommended Provisions for Seismic Regulations for New Buildingand Other Structures(2003 Edition)[S].Washington D C:Building Seismic Safety Council,FEMA 450/45119—38.
高孟潭,陈学良,肖和平,等.2009.湖南中强地震活动地区Ⅱ类场地放大效应研究[J].中国地震,25(2):140—150.GAO Meng-tan,CHEN Xue-liang,XIAO He-ping,et al.2009.Study on amplification effect of TypeⅡSites inmoderate earthquake area of Hunan[J].Earthquake Research In China,25(2):140—150(in Chinese).
国家技术监督局,中华人民共和国建设部.1993.构筑物抗震设计规范(GB50191-93)[S].北京:中国计划出版社.State Bureau of Technical Supervision and Ministry of Construction of P R China.1993.GB50191-93:Code forSeismic Design of Special Structures[S].China Planning Press,Beijing(in Chinese).
李小军,彭青.2001a.不同类别场地地震动参数的计算分析[J].地震工程与工程振动,21(1):29—36.LI Xiao-jun,PENG Qing.2001a.Calculation and analysis of earthquake ground motion parameters for different sitecategories[J].Earthquake Engineering and Engineering Vibration,21(1):29—36(in Chinese).
李小军,彭青,刘文忠.2001b.设计地震动参数确定中的场地影响考虑[J].世界地震工程,17(4):34—41.LI Xiao-jun,PENG Qing,LIU Wen-zhong.2001b.Consideration of site effects in determination of design earthquakeground motion parameters[J].World Information on Earthquake Engineering,17(4):34—41(in Chinese).
吕红山,卢福水,王建荣,等.2006.2005年11月26日九江—瑞昌地震场地影响的初步分析[J].震灾防御技术,1(1):63—69.LHong-shan,Lu FU-shui.WANG Jian-rong,et al.2006.Preliminary study on site effect and damage by JiujiangRuichang earthquake of 26 November,2005[J].Technology for Earthquake Disaster Prevention,1(1):63—69(in Chinese).
吕红山,赵凤新.2007.适用于中国场地分类的地震动反应谱放大系数[J].地震学报,29(1):67—76.LHong-shan,Zhao Feng-xin.2007.Site coefficients suitable to China site category[J].Acta Seismologica Sinica,29(1):67—76(in Chinese).
吕悦军,彭艳菊,施春花,等.2011.北京地区中硬场地地震动效应研究[J].防震减灾工程学报,31(5):523—528.LYue-jun,PENG Yan-ju,SHI Chun-hua,et al.2011.A study on seismic effect of medium-stiff soil site in Beijingarea[J].Journal of Disaster Prevention and Mitigation Engineering,31(5):523—528(in Chinese).
薛俊伟,刘伟庆,王曙光,等.2013.基于场地效应的地震动特性研究[J].地震工程与工程振动,33(1):16—23.XUE Jun-wei,LIU Wei-qing,WANG Shu-guang,et al.2013.Research on ground motion characteristics considering siteconditions[J].Journal of Earthquake Engineering and Engineering Vibration,33(1):16—23(in Chinese).
中国地震动参数区划图编图组,国家质量技术监督局.2001.GB18306-2001中国地震动参数区划图[S].北京:中国标准出版社.Compilation Committee of‘Seismic Ground Motion Parameter Zonation Map’,General Administration of QualitySupervision,Inspection and Quarantine of the People's Republic of China.2001.GB18306-2001:SeismicGround Motion Parameter Zonation Map of China[S].China Standards Press,Beijing(in Chinese)
Building Seismic Safety Council.2004.NEHRP Recommended Provisions for Seismic Regulations for New Buildingand Other Structures(2003 Edition)[S].Washington D C:Building Seismic Safety Council,FEMA 450/45119—38.
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