场地条件对地表峰值加速度的放大效应分析
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摘要
在研究西安地区大量钻孔资料的基础上,构造了44个不同等效剪切波速和覆盖层厚度场地条件下的典型场地剖面,利用一维等效线性化地震反应分析方法,计算了不同场地在3种不同强度的地震动输入下的地面峰值加速度,分析了地震动峰值加速度放大系数ks随场地类别、等效剪切波速Vse、覆盖层厚度H和输入地震动强度ar的变化特征,指出了按场地类别对地震动峰值加速度调整存在的问题。分析结果表明,加速度放大系数随等效剪切波速、覆盖层厚度及基岩输入地震动强度的增大而减小;等效剪切波速对加速度放大系数的影响大于覆盖层厚度的影响,随着输入地震动强度的增大,覆盖层厚度对加速度放大系数的影响成份有逐渐加大的趋势;覆盖层厚度对加速度放大系数的影响程度随着等效剪切波速的增大而逐渐减弱;加速度放大系数与场地等效剪切波速和覆盖层厚度之间具有较高的拟合度的统计回归关系。由此提出了直接用场地等效剪切波速和覆盖层厚度对地震动峰值加速度进行调整的新途径。最后,就地震动峰值加速度随场地条件的调整方法,提出了有待进一步研究的问题。
Based on abundant drilling data of the Xi'an avea,44 typical section planes were built according to the equivalent shear wave velocities and thickness of overlaying layer,and the peak accelerations of ground motion were calculated by the method of one-dimensional equivalent linearized earthquake response analysis corresponding to seismic ground motion with different intensites.In addition,the characteristics of ground peak acceleration amplification coefficient ks variating with site classification,equivalent shear wave velocity Vse and thickness of overlaying layer H and intensity of seismic ground motion ar were analyzed,and the conclusion that the peak acceleration adjusted according to site classification in the past should be defective is acquired.The results show that ks is decreasing when the values of Vse,H and ar are increasing.The results also show that ks is dominated by Vse more than by H,the effects of H increase gradually with the increasing of ar and reduce gradually with the increasing of Vse.Furthermore,ks should be expressed as a function depending on H and Vse.In the end,certain new methods of adjusting ground peak earthquake acceleration by controlling equivalent shear wave velocity and thickness of overlaying layer are suggested,and the problems needed to be researched more in the future are pointed out.
Based on abundant drilling data of the Xi'an avea,44 typical section planes were built according to the equivalent shear wave velocities and thickness of overlaying layer,and the peak accelerations of ground motion were calculated by the method of one-dimensional equivalent linearized earthquake response analysis corresponding to seismic ground motion with different intensites.In addition,the characteristics of ground peak acceleration amplification coefficient ks variating with site classification,equivalent shear wave velocity Vse and thickness of overlaying layer H and intensity of seismic ground motion ar were analyzed,and the conclusion that the peak acceleration adjusted according to site classification in the past should be defective is acquired.The results show that ks is decreasing when the values of Vse,H and ar are increasing.The results also show that ks is dominated by Vse more than by H,the effects of H increase gradually with the increasing of ar and reduce gradually with the increasing of Vse.Furthermore,ks should be expressed as a function depending on H and Vse.In the end,certain new methods of adjusting ground peak earthquake acceleration by controlling equivalent shear wave velocity and thickness of overlaying layer are suggested,and the problems needed to be researched more in the future are pointed out.
引文
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[2]李小军,彭青.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,2001,21(1):29-36.LI Xiaojun,PENG Qing.Consideration of site effecte for determination of design earthquake ground motion parameters[J].Journal of EarthquakeEngineering and Engineering Vibration,2001,21(1):29-36.(in Chinese)
[3]冯希杰,金学申.场地土对基岩峰值加速度放大效应分析[J].工程地质学报,2001,9(4):385-388.FENG Xijie,JIN Xueshen.Analysis on amplification effect of bedrock peak acceleration caused by site soil[J].Journal of Engineering Geology,2001,9(4):385-388.(in Chinese)
[4]薄景山,李秀领,刘德东,等.土层结构对反应谱特征周期的影响[J].地震工程与工程振动,2003b,23(5):42-45.BO Jingshan,LI Xiuling,LIU DEdong,et al.Effects of soil layer construction on characteristic periods of response spectra[J].Journal of Earth-quake Engineering and Engineering Vibration,2003b,23(5):42-45.(in Chinese)
[5]薄景山,李秀领,刘红帅.土层结构对地表加速度峰值的影响[J].地震工程与工程振动,2003c,23(3):35-40.BO Jingshan,LI Xiuling,LIU Hongshuai.Effects of soil layer construction on peak accelerations of ground motions[J].Journal of Earthquake En-gineering and Engineering Vibration,2003c,23(3):35-40.(in Chinese)
[6]高孟潭,陈学良,肖和平,等.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,2009,25(2):140-150.GAO Mengtan,CHEN Xueliang,Xiao Heping,et al.Study on amplification effect of typeⅡsites in moderate earthquake area of Hunan[J].Earthquake Research in China,2009,25(2):140-150.(in Chinese)
[7]刁颋.山东Ⅱ、Ⅲ类场地地震动峰值加速度放大效应分析[J].中国地震,2011,27(1):92-98.DIAO Ting.Exploration for amplification effects of peek ground motion in the sites of typesⅡ&Ⅲin Shandong Province[J].Earthquake Re-search in China,2011,27(1):92-98.(in Chinese)
[8]吕悦军,彭艳菊,兰景岩,等.场地条件对地震动参数影响的关键问题[J].震灾防御技术,2008,3(2):126-135.LU Yuejun,PENG Yanju,LAN Jingyan,et al.Some key problems about site effects on seismic ground motion parameters[J].Technology forEarthquake Disaster Prevention,2008,3(2):126-135.(in Chinese)
[9]Building Seismic Safety Council(BSSC).1994 Edition NEHRP recommended provisions for seismic regulations for new buildings[S].FEMA222A/223A.Vol.1(provisions)and Vol.2(Commentary).Developed for the Federal Emergency Management Agency.Washinton,DC.1995.
[10]Building Seismic Safety Council(BSSC).2009 Edition NEHRP recommended provisions for new buildings and other structures[S].FEMA P-750.Building Seismic Safety Council.Washinton,DC.2009.
[11]GB50011-2001建筑抗震设计规范[S].GB50011-2001Code for Seismic Design of Buildings[S].(in Chinese)
[12]GB50011-2010建筑抗震设计规范[S].GB50011-2010 Specifications for Antiseismic Construction Design[S].(in Chinese)
[13]GB18306-2001中国地震动参数区划图[S].GB18306-2001Seismic Ground Motion Parameter Zonation Map of China[S].(in Chinese)
[14]卢寿德,高孟潭,陈国星,等.GB17741-2005《工程场地地震安全性评价》宣贯教材[M].北京:中国标准出版社,2005.LU Shoude,GAO Mengtan,CHEN Guoxing,et al.GB17741-2005 Publicizing material of evaluation of seismic safety for engineering sites[M].Beijing:Standards Press of China,2005.(in Chinese)
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