汶川地震不同场地反应谱平台值统计分析
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摘要
加速度反应谱平台值表征地震动的强度特性,场地条件是影响反应谱平台值的一个重要因素。本文选取6组同一地区断层距相近而场地条件不同的强震记录,对其标准化的加速度反应谱形状及平台值进行分析;并以汶川地震中173个有详细地勘场地上的强震记录为基础,统计分析了不同场地类别和断层距区间内的加速度反应谱平台值。本文研究结果显示,场地条件对加速度反应谱平台值有较大影响,随着场地变软,加速度反应谱平台值增大。本文定义了场地影响系数,计算并给出了不同地面峰值加速度对应的场地影响系数。
Peak flat values of response spectra denote the strength characteristic of ground motions,and site conditions are important factors affecting the parameters.This paper selects six sets of strong ground motion records with the same distance from the fault but different site conditions and analyzes the forms and the peak flat values of the normalized response spectra.Based on the strong ground motion records from 173 sites with detailed reconnaissance,the authors analyze the average flat values with different site conditions and different distances from the fault.It is proved that site conditions have a great impact on the peak flat values of acceleration response spectra.The peak flat values of acceleration response spectra increase with the site becoming soft.The authors define and calculate the site effect coefficients of the peak flat values of acceleration response spectra under different site conditions with different peak ground acceleration mean values.
Peak flat values of response spectra denote the strength characteristic of ground motions,and site conditions are important factors affecting the parameters.This paper selects six sets of strong ground motion records with the same distance from the fault but different site conditions and analyzes the forms and the peak flat values of the normalized response spectra.Based on the strong ground motion records from 173 sites with detailed reconnaissance,the authors analyze the average flat values with different site conditions and different distances from the fault.It is proved that site conditions have a great impact on the peak flat values of acceleration response spectra.The peak flat values of acceleration response spectra increase with the site becoming soft.The authors define and calculate the site effect coefficients of the peak flat values of acceleration response spectra under different site conditions with different peak ground acceleration mean values.
引文
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[10]郭晓云.汶川地震反应谱研究[D].哈尔滨:中国地震局工程力学研究所,2011.(in Chinese)GUO Xiaoyun.Study on response spectrum of Wenchuan earthquake[D].Harbin:Institute of Engineering Mechanics,China Earthquake Admin-istration,2011.
[11]郭晓云,薄景山,张宇东,等.抗震设计反应谱的标定方法[J].世界地震工程,2011,27(1):191-196.GUO Xiaoyun,BO Jingshan,ZHANG Yudong,et al.Methods of calibrating seismic design response spectrum[J].World Earthquake Engineer-ing,2011,27(1):191-196.(in Chinese)
[12]李平,薄景山,孙有为,等.场地类型对反应谱平台值的影响[J].地震工程与工程振动,2011,31(1):25-29.LI Ping,BO Jingshan,SUN Youwei,et al.Effects of site types on flat section values of response spectra[J].Journal of Earthquake Engineeringand Engineering Vibration,2011,31(1):25-29.(in Chinese)
[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):29-37.LI Xiaojun,PENG Qing.Calculation and analysis of earthquake ground motion parameters for diferent site categories[J].Journal of EarthquakeEngineering and Engineering Vibration,2001,21(1):29-37.(in Chinese)
[3]李小军,彭青,刘文忠.设计地震动参数确定中的场地影响考虑[J].世界地震工程,2001,17(4):34-42.LI Xiaojun,PENG Qing,LIU Wenzhong.Consideration of site effects for determination of design earthquake ground motion parameters[J].WorldEarthquake Engineering,2001,17(4):34-42.(in Chinese)
[4]耿淑伟.抗震设计规范中地震作用的规定[D].哈尔滨:中国地震局工程力学研究所,2005.GENG Shuwei.Earthquake action provision in Seismic Design Code[D].Harbin:Institute of Engineering Mechanics,China Earthquake Adminis-tration,2005.(in Chinese)
[5]吕红山,赵凤新.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,2007,29(1):67-81.LV Hongshan,ZHAO Fengxin.Amplificatory coefficient of earthquake ground motion response spectrum applicable for Chinese site types[J].ActaSeismologica Sinica,2007,29(1):67-81.(in Chinese)
[6]薄景山,吴兆营,翟庆生,等.三种土层结构反应谱平台值的统计分析[J].地震工程与工程振动.,2004,24(2):23-29.BO Jingshan,WU Zhaoying,ZHAI Qingsheng,et al.Statistical analysis on flat section values of response spectra in three kinds of soil layer con-structions[J].Journal of Earthquake Engineering and Engineering Vibration.2004,24(2):23-29.(in Chinese)
[7]薄景山.场地分类和设计反应谱调整方法研究[R].中国地震局工程力学研究所博士后研究工作报告,1998.BO Jingshan.Study on methods of site classification and seismic design response spectra adjusting[R].Post-doctoral Work Record,Institute of En-gineering Mechanics,China Earthquake Administration,1998.(in Chinese)
[8]薄景山,李秀领,刘德东,等.土层结构对反应谱平台值的影响[J].地震工程与工程振动,2003,23(4):22-27.BO Jingshan,LI Xiuling,LIU Dedong,et al.Efects of soil layer construction on platform value of response spectra[J].Journal of Earthquake Engi-neering and Engineering Vibration.2003,23(4):22-27.(in Chinese)
[9]GUO Xiaoyun,BO Jingshan,LI Ping.Least square method to calibrate seismic design response spectrum[J].Advanced Materials Research 378-379(2012):358-361.
[10]郭晓云.汶川地震反应谱研究[D].哈尔滨:中国地震局工程力学研究所,2011.(in Chinese)GUO Xiaoyun.Study on response spectrum of Wenchuan earthquake[D].Harbin:Institute of Engineering Mechanics,China Earthquake Admin-istration,2011.
[11]郭晓云,薄景山,张宇东,等.抗震设计反应谱的标定方法[J].世界地震工程,2011,27(1):191-196.GUO Xiaoyun,BO Jingshan,ZHANG Yudong,et al.Methods of calibrating seismic design response spectrum[J].World Earthquake Engineer-ing,2011,27(1):191-196.(in Chinese)
[12]李平,薄景山,孙有为,等.场地类型对反应谱平台值的影响[J].地震工程与工程振动,2011,31(1):25-29.LI Ping,BO Jingshan,SUN Youwei,et al.Effects of site types on flat section values of response spectra[J].Journal of Earthquake Engineeringand Engineering Vibration,2011,31(1):25-29.(in Chinese)
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