层状场地中透镜体对地震动影响的基本规律
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摘要
本文采用有限元方法研究层状场地中透镜体对地震动影响的基本规律,分析层状场地与均匀场地的差别、含透镜体场地与不含透镜体场地对地震动影响的差别,以及透镜体埋深、宽度、厚度、刚度和输入波频谱等因素对地震动反应谱的影响。研究表明,层状场地与其等效的均匀场地有着显著的差别;透镜体的存在对地震动有显著的放大作用,该放大作用可达93.5%;由于入射波在透镜体周围的散射,会产生竖向加速度,且竖向加速度的短周期成分相对较多;透镜体埋深、宽度、厚度、刚度以及输入波频谱等因素对地震动反应谱具有重要的影响。
This paper investigates the effect of a lenticle in a layered site on ground motion by using finite element method,and discusses the difference between the layered site and the equivalent homogeneous site,and the difference between the layered site with a lenticle and its free field,and the effects of the lenticle's depth,width,thickness and stiffness and the incident wave spectrum on the ground motion.It is shown that there is significant difference between the layered site and the equivalent homogeneous site,a lenticle can significantly amplify the ground motion and the amplification can be 93.5% larger than the free-field response;due to scattering of the incident waves there exists vertical acceleration with more short-period contents;lenticle's depth,width,thickness and stiffness and the incident wave spectrum have great effects on the ground motion.
This paper investigates the effect of a lenticle in a layered site on ground motion by using finite element method,and discusses the difference between the layered site and the equivalent homogeneous site,and the difference between the layered site with a lenticle and its free field,and the effects of the lenticle's depth,width,thickness and stiffness and the incident wave spectrum on the ground motion.It is shown that there is significant difference between the layered site and the equivalent homogeneous site,a lenticle can significantly amplify the ground motion and the amplification can be 93.5% larger than the free-field response;due to scattering of the incident waves there exists vertical acceleration with more short-period contents;lenticle's depth,width,thickness and stiffness and the incident wave spectrum have great effects on the ground motion.
引文
[1]GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[2]Dravinski M.Ground motion amplification due to elastic inclusion in a half-space[J].Earthq Eng Struct Dynam,1983,11:313-335.
[3]Wong C K,Shah AH,Datta S K.Diffraction of elastic waves in a half-space.II.analytical and numerical solutions[J].Bull Seism Soc Am,1985,75(1):69-92.
[4]Manoogian M,Lee VW.Diffraction of SH-waves by subsurface inclusions of arbitrary shape[J].J Eng Mech,ASCE,1996,122(2):123-129.
[5]袁晓铭.地表下圆形夹塞区出平面散射对地面运动的影响[J].地球物理学报,1996,39(3):373-381.
[6]廖振鹏,刘晶波.波动有限元模拟的基本问题[J].中国科学(B辑),1992(8):874-882.
[7]廖振鹏.工程波动理论导论[M].2版.北京:科学出版社,2002.
[8]刘晶波,李彬.三维黏弹性静-动力统一人工边界[M].中国科学(E辑),2005,35(9):966-980.
[9]袁晓铭,孙锐.饱和砂土透镜体液化对建筑物地震反应的影响[J].地震工程与工程振动,2000,20(1):68-74.
[10]梁建文,张炳政,巴振宁.基岩上均匀场地中透镜体对地震动影响的基本规律[J].天津大学学报(已录用).
[11]Lysmer J,Udaka T,Tsai C-F,et al.FLUSH:a computer program for approximate 3-D analysis of soil-structure interaction problems[R].EERC 75-30,Berkeley:Earthquake Engineering Research Center,University of California,1975.
[2]Dravinski M.Ground motion amplification due to elastic inclusion in a half-space[J].Earthq Eng Struct Dynam,1983,11:313-335.
[3]Wong C K,Shah AH,Datta S K.Diffraction of elastic waves in a half-space.II.analytical and numerical solutions[J].Bull Seism Soc Am,1985,75(1):69-92.
[4]Manoogian M,Lee VW.Diffraction of SH-waves by subsurface inclusions of arbitrary shape[J].J Eng Mech,ASCE,1996,122(2):123-129.
[5]袁晓铭.地表下圆形夹塞区出平面散射对地面运动的影响[J].地球物理学报,1996,39(3):373-381.
[6]廖振鹏,刘晶波.波动有限元模拟的基本问题[J].中国科学(B辑),1992(8):874-882.
[7]廖振鹏.工程波动理论导论[M].2版.北京:科学出版社,2002.
[8]刘晶波,李彬.三维黏弹性静-动力统一人工边界[M].中国科学(E辑),2005,35(9):966-980.
[9]袁晓铭,孙锐.饱和砂土透镜体液化对建筑物地震反应的影响[J].地震工程与工程振动,2000,20(1):68-74.
[10]梁建文,张炳政,巴振宁.基岩上均匀场地中透镜体对地震动影响的基本规律[J].天津大学学报(已录用).
[11]Lysmer J,Udaka T,Tsai C-F,et al.FLUSH:a computer program for approximate 3-D analysis of soil-structure interaction problems[R].EERC 75-30,Berkeley:Earthquake Engineering Research Center,University of California,1975.
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