汶川地震中远场深覆盖土层动力反应分析
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摘要
对上海佘山地震台在汶川地震中测得的基岩波地震记录进行频谱特性分析,然后以同济大学教学科研综合楼场地土层为研究对象,应用水平成层土层地震反应的一维有限元方法,分析该深覆盖场地在这一实测地震记录作用下的动力反应,并将其与同济大学强震监测台在汶川地震中获得的地表波记录进行对比。结果表明:汶川地震的远场地震动记录中,基岩波的长周期卓越性比地表波更为明显;而在土层剪应变为10-6~10-4的小变形阶段,《上海市地震动参数区划》中给出的各类土壤的阻尼比建议值明显偏小。最后,对阻尼比的修正进行了一些探讨。
The characteristics of frequency spectrum of seismic acceleration records during Wenchuan Earthquake obtained by the Sheshan seismic station in Shanghai were analyzed.Then,the seismic ground responses of the Teaching and Research Building site in Tongji University were computed with the 1-D finite element method for horizontal layer.Furthermore,the simulated results were compared with the measured data recorded by the strong earthquake monitoring station in Tongji University during Wenchuan Earthquake.The results show,in the far-field ground motions of Wenchuan Earthquake,long period components of the bedrock waves are even more remarkable than the ground waves.Besides,the suggested values of soil damping ratio in Shanghai Seismic Ground Motion parameter zonation are relatively small.Finally,authors discussed the correction of damping ratio.
The characteristics of frequency spectrum of seismic acceleration records during Wenchuan Earthquake obtained by the Sheshan seismic station in Shanghai were analyzed.Then,the seismic ground responses of the Teaching and Research Building site in Tongji University were computed with the 1-D finite element method for horizontal layer.Furthermore,the simulated results were compared with the measured data recorded by the strong earthquake monitoring station in Tongji University during Wenchuan Earthquake.The results show,in the far-field ground motions of Wenchuan Earthquake,long period components of the bedrock waves are even more remarkable than the ground waves.Besides,the suggested values of soil damping ratio in Shanghai Seismic Ground Motion parameter zonation are relatively small.Finally,authors discussed the correction of damping ratio.
引文
[1]蔡宏英,周健,李相崧.深厚覆盖软土地层多向地震动力反应分析[J].同济大学学报,2000,28(2):177-182.Cai H Y,Zhou J,Li X S.Plasto-elastic dynamicresponse of horizontally layered sites under multi-directional earthquake shaking[J].Journal of TongjiUniversity,2000,28(2):177-182.
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[7]顾梦林,骆鸣津,唯建设.上海佘山压容式钻孔应变仪观测资料的调和分析[J].地震学报,1986,8(2):197-210.Gu M L,Luo M J,Wei J S.Harmonic analysis ofstrain tidal data observed by a borehole strainmeter ofcapacitive displacement type at the Sheshan station[J].Acta Seismologica Sinica,1986,8(2):197-210.
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[11]邬都,楼梦麟.水平成层土层地震反应分析的一维有限元方法[J].震灾防御技术,2008,3(1):45-52.Wu D,Lou M L.Seismic response analysis inhorizontal layer with 1-D finite element method[J].Technology for Earthquake Disaster Prevention,2008,3(1):45-52.
[12]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.Zhang K X,Xie J F.Soil Dynamics[M].Beijing:Seismological Press,1989.
[13]上海市地震局,同济大学.上海市地震动参数区划[M].北京:地震出版社,2004.Shanghai Seismological Bureau,Tongji University.Shanghai Seismic Ground Motion Parameter Zonation[M].Beijing:Seismological Press,2004.
[14]楼梦麟,杨燕,潘小樟,等.汶川地震中上海高层建筑动力反应分析[J].建筑科学与工程学报,2009,26(3):82-88.Lou M L,Yang Y,Pan X Z,et al.Dynamic responseanalysis of high-rise buildings in Shanghai duringWenchuan earthquake[J].Journal of Architecture andCivil Engineering,2009,26(3):82-88.
[15]孙静,袁晓铭.土的动模量和阻尼比研究述评[J].世界地震工程,2003,19(1):88-95.Sun J,Yuan X M.A state-of-art of research ondynamic modulus and damping ratio of soils[J].World Earthquake Engineering,2003,19(1):88-95.
[16]包惠棣,吴俊壁,徐存森.用共振柱法测定上海地区粘性土动力特性参数[J].勘察科学技术,1989,(2):18-23.Bao H D,Wu J B,Xu C S.Determination of dynamicproperties of Shanghai clays using resonant columntest[J].Site Investigation Science and Technology,1989,(2):18-23.
[2]袁丽侠.场地土对地震波的放大效应[J].世界地震工程,2003,19(1):113-120.Yuan L X.The amplifying effect of ground soil toearthquake wave[J].World Earthquake Engineering,2003,19(1):113-120.
[3]徐永林,熊里军,章纯,等.用强震仪记录资料研究上海地表土层的地震动放大反应[J].地震学报,2002,24(6):662-666.Xu Y L,Xiong L J,Zhang C,et al.A study onamplification response of soil ground motion inShanghai using strong-motion accelerogaph records[J].Acta Seismologica Sinica,2002,24(6):662-666.
[4]黄雨,叶为民,唐益群,等.上海软土场地的地震反应特征分析[J].地下空间与工程学报,2005,1(5):773-778.Huang Y,Ye W M,Tang Y Q,et al.Characteristicanalysis for seismic ground response of soft soils inShanghai[J].Chinese Journal of Underground Spaceand Engineering,2005,1(5):773-778.
[5]杨伟林,朱升初,洪海春,等.汶川地震远场地震动特征及其对长周期结构影响的分析[J].防灾减灾工程学报,2009,29(4):473-478.Yang W L,Zhu S C,Hong H C,et al.Characteristics of far-field ground motion ofWenchuan earthquake and the effect on long-periodicstructures[J].Journal of Disaster Prevention andMitigation Engineering,2009,29(4):473-478.
[6]寿海涛.佘山地震基准台简介[J].防灾技术高等专科学校学报,2006,8(1):44-46.Shou H T.Introduction of Sheshan seismic station[J].Journal of College of Disaster PreventionTechniques,2006,8(1):44-46.
[7]顾梦林,骆鸣津,唯建设.上海佘山压容式钻孔应变仪观测资料的调和分析[J].地震学报,1986,8(2):197-210.Gu M L,Luo M J,Wei J S.Harmonic analysis ofstrain tidal data observed by a borehole strainmeter ofcapacitive displacement type at the Sheshan station[J].Acta Seismologica Sinica,1986,8(2):197-210.
[8]GB 50011-2001,建筑抗震设计规范[S].
[9]DGJ 08-9-2003,J10284-2003,建筑抗震设计规程[S].
[10]翁大根,徐植信.上海地区抗震设计反应谱研究[J].同济大学学报,1993,21(1):9-16.Weng D G,Xu Z X.A study on seismic designspetrum for Shanghai area[J].Journal of TongjiUniversity,1993,21(1):9-16.
[11]邬都,楼梦麟.水平成层土层地震反应分析的一维有限元方法[J].震灾防御技术,2008,3(1):45-52.Wu D,Lou M L.Seismic response analysis inhorizontal layer with 1-D finite element method[J].Technology for Earthquake Disaster Prevention,2008,3(1):45-52.
[12]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.Zhang K X,Xie J F.Soil Dynamics[M].Beijing:Seismological Press,1989.
[13]上海市地震局,同济大学.上海市地震动参数区划[M].北京:地震出版社,2004.Shanghai Seismological Bureau,Tongji University.Shanghai Seismic Ground Motion Parameter Zonation[M].Beijing:Seismological Press,2004.
[14]楼梦麟,杨燕,潘小樟,等.汶川地震中上海高层建筑动力反应分析[J].建筑科学与工程学报,2009,26(3):82-88.Lou M L,Yang Y,Pan X Z,et al.Dynamic responseanalysis of high-rise buildings in Shanghai duringWenchuan earthquake[J].Journal of Architecture andCivil Engineering,2009,26(3):82-88.
[15]孙静,袁晓铭.土的动模量和阻尼比研究述评[J].世界地震工程,2003,19(1):88-95.Sun J,Yuan X M.A state-of-art of research ondynamic modulus and damping ratio of soils[J].World Earthquake Engineering,2003,19(1):88-95.
[16]包惠棣,吴俊壁,徐存森.用共振柱法测定上海地区粘性土动力特性参数[J].勘察科学技术,1989,(2):18-23.Bao H D,Wu J B,Xu C S.Determination of dynamicproperties of Shanghai clays using resonant columntest[J].Site Investigation Science and Technology,1989,(2):18-23.
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