基岩上均匀场地中透镜体对地震动的影响
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摘要
采用有限元方法研究了基岩上均匀场地中透镜体对地震动影响的基本规律,分析了含透镜体的场地与不含透镜体的场地对地震动影响的差别,针对透镜体埋深、宽度、厚度、刚度以及输入波频谱等因素对地震动反应谱的影响进行了研究.研究表明,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49.7%;由于透镜体对入射波的散射,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.
The effect of lenticle in single layer on bedrock on ground motion was studied using finite element method.The difference between the effect of field with lenticle and that of field without lenticle on ground motion was analyzed and the impacts of the lenticle’s depth,width,thickness,stiffness and the incident wave’s spectrum on response spectrum of the ground motion was also investigated.Study shows that lenticle has significant,that is,up to 49.7% amplification of the ground motion and leads to vertical acceleration with more short-period contents by scattering of the incident waves.In addition,the lenticle’s depth,width,thickness,stiffness and the incident wave’s spectrum have great effect on response spectrum of the ground motion.
The effect of lenticle in single layer on bedrock on ground motion was studied using finite element method.The difference between the effect of field with lenticle and that of field without lenticle on ground motion was analyzed and the impacts of the lenticle’s depth,width,thickness,stiffness and the incident wave’s spectrum on response spectrum of the ground motion was also investigated.Study shows that lenticle has significant,that is,up to 49.7% amplification of the ground motion and leads to vertical acceleration with more short-period contents by scattering of the incident waves.In addition,the lenticle’s depth,width,thickness,stiffness and the incident wave’s spectrum have great effect on response spectrum of the ground motion.
引文
[1]中华人民共和国建设部.GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.Ministry of Construction of the People's Republic of China.GB50011—2001 Code for Seismic Design of Buildings[S].Beijing:China Architectural Industry Press,2001(in Chinese).
[2]Dravinski M.Ground motion amplification due to elastic inclusions in a half-space[J].Earthquake Engineering and Structural Dynamics,1983,11(3):313-335.
[3]Wong C K,Shah A H,Datta S K.Diffraction of elastic waves in a half-space(Ⅱ):Analytical and numerical so-lutions[J].Bulletin of Seismological Society of America,1985,75(1):69-92.
[4]Manoogian M,Lee V W.Diffraction of SH-waves by subsurface inclusions of arbitrary shape[J].Journal of Engineering Mechanics,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.Yuan Xiaoming.Effect of a circular underground inclu-sion on surface motion under incident plane SH waves[J].Chinese Journal of Geophics,1996,39(3):373-381(in Chinese).
[6]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.Yuan Xiaoming,Sun Rui.Effect of liquefaction of len-ticular saturated sand zone on seismic response of build-ing[J].Earthquake Engineering and Engineering Vibra-tion,2000,20(1):68-74(in Chinese).
[7]Lysmer J,Udaka T,Tsai C-F,et al.FLUSH:A Computer Program for Approximate 3-D Analysis of Soil-Structure Interaction Problems[R].Earthquake Engineering Re-search Center,University of California,Berkeley,1975.
[2]Dravinski M.Ground motion amplification due to elastic inclusions in a half-space[J].Earthquake Engineering and Structural Dynamics,1983,11(3):313-335.
[3]Wong C K,Shah A H,Datta S K.Diffraction of elastic waves in a half-space(Ⅱ):Analytical and numerical so-lutions[J].Bulletin of Seismological Society of America,1985,75(1):69-92.
[4]Manoogian M,Lee V W.Diffraction of SH-waves by subsurface inclusions of arbitrary shape[J].Journal of Engineering Mechanics,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.Yuan Xiaoming.Effect of a circular underground inclu-sion on surface motion under incident plane SH waves[J].Chinese Journal of Geophics,1996,39(3):373-381(in Chinese).
[6]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.Yuan Xiaoming,Sun Rui.Effect of liquefaction of len-ticular saturated sand zone on seismic response of build-ing[J].Earthquake Engineering and Engineering Vibra-tion,2000,20(1):68-74(in Chinese).
[7]Lysmer J,Udaka T,Tsai C-F,et al.FLUSH:A Computer Program for Approximate 3-D Analysis of Soil-Structure Interaction Problems[R].Earthquake Engineering Re-search Center,University of California,Berkeley,1975.
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