场地总体非线性动力特性识别方法
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摘要
提出了场地总体非线性动力特性识别的一个方法。方法以一已知参考场地为基础,假定待识别场地和参考场地具有相同的基岩露头运动,根据待识别场地和参考场地地表强震和弱震记录,识别场地的总体非线性动力特性。以天津地区两个实际场地(一个作为参考场地,一个作为待识别场地)为例对场地总体非线性动力特性进行了识别。研究表明:方法能准确识别场地总体非线性动力特性,可直接应用于实际工程。
A method of estimating the general nonlinear dynamic characteristics is proposed,i.e.,the relation between dynamic shear modulus and shear strain and the relation between damping ratio and shear strain,of an unknown site,in which,a known reference site is introduced,and both the unknown site and the reference site are assumed to have the same bedrock outcrop motion,and strong shock and weak shock records of the two sites are used for the estimation.To verify the method,the general nonlinear dynamic characteristics of two real sites in Tianjin district are estimated,and the surface seismic responses and their response spectra of the unknown site under the excitation of Hollywood wave and Treasure Island wave are calculated.It is shown that the proposed method can accurately estimate the general nonlinear dynamic characteristics of the unknown site,and it can be directly applied to engineering practices.
A method of estimating the general nonlinear dynamic characteristics is proposed,i.e.,the relation between dynamic shear modulus and shear strain and the relation between damping ratio and shear strain,of an unknown site,in which,a known reference site is introduced,and both the unknown site and the reference site are assumed to have the same bedrock outcrop motion,and strong shock and weak shock records of the two sites are used for the estimation.To verify the method,the general nonlinear dynamic characteristics of two real sites in Tianjin district are estimated,and the surface seismic responses and their response spectra of the unknown site under the excitation of Hollywood wave and Treasure Island wave are calculated.It is shown that the proposed method can accurately estimate the general nonlinear dynamic characteristics of the unknown site,and it can be directly applied to engineering practices.
引文
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[13]何颖.场地总体非线性动力特性识别方法[D].天津:天津大学,2011.(HE Ying.A method of estimating the sitegeneral nonlinear dynamic characteristics[D].Tianjin:TianjinUniversity,2011.(in Chinese))
[2]谢君斐,石兆吉.地面运动的反演及其在震害分析中的应用[J].地震工程与工程振动,1981,1(2):9–24.(XIEJun-fei,SHI Zhao-ji.The inverse calculation of groundmotion with application to earthquake damage analysis[J].Journal of Earthquake Engineering and Engineering Vibration,1981,1(2):9–24(in Chinese))
[3]陈厚群,侯顺载,王均.拱坝自由场地震输入和反应[J].地震工程与工程振动,1990,10(2):53–64.(CHENHou-qun,HOU Shun-zai,WANG Jun.Earthquake input andfree-field motion response of arch dams[J].Journal ofEarthquake Engineering and Engineering Vibration,1990,10(2):53–64(in Chinese))
[4]沈凤生,潘恕,常向前.自由场地震反演分析及其在三门峡火电厂龙沟灰坝的应用[J].人民黄河,1993(2):29–38.(SHEN Feng-sheng,PAN Shu,CHANG Xiang-qian.Seismic inversion analysis of free field and its application inLonggou ash dam of the Sanmenxia thermal power plant[J].Yellow River,1993(2):29–38.(in Chinese))
[5]蔡袁强,凌道盛,周迪永,等.非线性分层地基地面运动反演分析[J].振动工程学报,2000,13(3):426–432.(CAIYuan-qiang,LING Dao-sheng,ZHOU Di-yong,et al.Inversecalculational analysis of ground motion in non-linear layeredsoil[J].Journal of Vibration Engineering,2000,13(3):426–432.(in Chinese))
[6]ELGAMAL A W,ZEGHAL M,TANG H T,et al.Lotungdownhole array.I:evaluation of site dynamic properties[J].Journal of Geotechnical Engineering,ASCE,1995,121(4):350–362.
[7]ZEGHAL M,ELGAMAL A W,TANG H T,et al.Lotungdownhole array.II:evaluation of soil nonlinear properties[J].Journal of Geotechnical Engineering,ASCE,1995,121(4):363–378.
[8]SATOH T,HORIKE M,TAKEUCHI Y,et al.Non-linearbehavior of scoria evaluated from borehole records in easternShizuoka prefecture,Japan[J].Earthquake Engineering andStructural Dynamics,1997,26:781–795.
[9]SATOH T,FUSHIMI M,TATSUMI Y.Inversion ofstrain-dependent nonlinear characteristics of soils using weakand strong motions observed by borehole sites in Japan[J].Bulletin of the Seismological Society of America,2001,91(2):365–380.
[10]刘增荣,黄义.基岩输入运动未知条件下的地基参数识别[J].岩土工程学报,2000,22(6):723–726.(LIUZeng-rong,HUANG Yi.Foundation parameter identificationunder the condition of unknown motion input from the baserock[J].Chinese Journal of Geotechnical Engineering,2000,22(6):723–726.(in Chinese))
[11]陈学良.土体动力特性复杂场地非线性地震反应及其方法研究[D].哈尔滨:中国地震局工程力学研究所,2006.(CHEN Xue-liang.Study on soil dynamic characteristics,nonlinear seismic response of complex site and itsmethods[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2006.(in Chinese))
[12]胡聿贤.地震工程学[M].北京:地震出版社,2006.(HUYu-xian.Earthquake engineering[M].Beijing:SeismologicalPress,2006.(in Chinese))
[13]何颖.场地总体非线性动力特性识别方法[D].天津:天津大学,2011.(HE Ying.A method of estimating the sitegeneral nonlinear dynamic characteristics[D].Tianjin:TianjinUniversity,2011.(in Chinese))
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