河谷地形对土层地震反应的影响
|
摘要
为了分析河谷对土层地震反应的影响,采用二维有限元法,对跨度500m的某河谷地形的土层进行地震反应分析.为研究地震波传播过程对土层地震反应的影响,分析比较了一致地震输入和行波地震输入作用下土层线性和等效线性化地震反应的差异.同时将有限元计算结果与层状土层的一维波动分析结果相比较,讨论河谷地形对土层地震反应的影响.数值计算的结果表明:在水平地震输入作用下,由于河谷的存在,在河谷附近将会激起较大的竖向运动;与一致地震输入相比,在行波地震输入作用下,土层表面水平加速度反应减小,竖向加速度反应增大.
In order to analyze the effects of valley topography on the seismic responses of soil sites,the linear and equivalent-linear seismic responses of a valley with a span length of 500 m were calculated by applying the direct finite element method,respectively.As the span of the valley is large,the discrepancy of seismic responses of the soil sites was compared under uniform excitation and traveling wave excitation.At the same time,based on the wave propagation theory,the seismic responses of layered soil were evaluated for discussing the valley topography effect.The results show that the valley topography effect will lead to considerable vertical motion.Comparing with uniform excitation,the horizontal acceleration response is decreased and the vertical acceleration response is increased when under the excitation of traveling waves.
In order to analyze the effects of valley topography on the seismic responses of soil sites,the linear and equivalent-linear seismic responses of a valley with a span length of 500 m were calculated by applying the direct finite element method,respectively.As the span of the valley is large,the discrepancy of seismic responses of the soil sites was compared under uniform excitation and traveling wave excitation.At the same time,based on the wave propagation theory,the seismic responses of layered soil were evaluated for discussing the valley topography effect.The results show that the valley topography effect will lead to considerable vertical motion.Comparing with uniform excitation,the horizontal acceleration response is decreased and the vertical acceleration response is increased when under the excitation of traveling waves.
引文
[1]Trifunac MD.Scattering of plane SHwaves by a semicylindrical canyon.Earthquake Eng Struct Dyn,1973,1:267
[2]Wong H L,Trifunac M D.Scattering of plane SH waves by a semielliptical canyon.Earthquake Eng Struct Dyn,1974,3:157
[3]Wong HL,Jennings P C.Effects of canyontopography onstrong ground motion.Bull Seism Soc Am,1975,65:1239
[4]Yang B P,Yang X M.Seismic response of structures on complex sites.Earthquake Eng Eng Vib,1997,17(2):10(杨柏坡,杨笑梅.复杂场地上结构地震反应的研究.地震工程和工程振动,1997,17(2):10)
[5]Zhang C H,Zhao C B.Effects of canyonshape on plane SHwave scatterings.Chin J Geotech Eng,1990,12(1):1(张楚汉,赵崇斌.河谷形态对平面SH波散射的影响.岩土工程学报,1990,12(1):1)
[6]Li S Y,Liao Z P.Wave-type conversion caused by a step topog-raphy subjected to inclined seismic body wave.Earthquake Eng Eng Vib,2002,22(4):10(李山有,廖振鹏.地震体波斜入射情形下台阶地形引起的波型转换.地震工程和工程振动,2002,22(4):10)
[7]Nguyen K V,Gatmiri B.Evaluation of seismic ground motionin-duced by topographic irregularity.Soil Dyn Earthquake Eng,2007,27:183
[8]Kiureghian A D,Neuenhofer A.Response spectrum method for multi-support seismic excitations.Earthquake Eng Struct Dyn,1992,21:713
[9]Kiureghian A D,Neuenhofer A.Acoherency model for spatially varying ground motions.Earthquake Eng Struct Dyn,1996,25:99
[10]Liao Z P.Earthquake Microzonation:Theory and Pratice.Beijing:Seismological Press,1989(廖振鹏.地震小区划:理论与实践.北京:地震出版社,1989)
[11]Wang MS,Pan D G,Zhou Xiyuan.Soil-structure interaction analysis based on the soil lumped parameters model.J Univ Sci Technol Beijing,2007,29(1):5(王满生,潘旦光,周锡元.基于集总参数模型的土-结构动力相互作用分析.北京科技大学学报,2007,29(1):5)
[12]Lou ML,Fan Y Q,Ye AJ.Computation of site seismic re-sponse for Sutong Bridgein preli minary design phase.J Disaster Prev Mitig Eng,2007,27(4):429(楼梦麟,范么清,叶爱君.苏通大桥初设阶段主桥场地地震反应计算.防灾减灾工程学报,2007,27(4):429)
[13]Chopra A K.Dynamics of Structures:Theory and Applica-tions to Earthquake Engineering.Printice-Hall New Jersey,1995
[14]Lou M L,Pan D G,Fan L C.Effect of Vertical Artificial Boundary on Seismic Response of Soil Layer.JTongji Univ Nat Sci,2003,31(7):757(楼梦麟,潘旦光,范立础.土层地震反应分析中侧向人工边界影响的数值研究.同济大学学报:自然科学版,2003,31(7):757)
[15]Pan D G,Lou ML,Dong C.Effect of vertical artificial bound-ary on seismic response of soil layer under traveling wave excita-tions.Chin J Geotech Eng,2005,27(3):308(潘旦光,楼梦麟,董聪.土层地震行波反应分析中侧向人工边界的影响.岩土工程学报,2005,27(3):308)
[16]Lysmer J,Udaka T,Tshi C F,et al.Flush,a computer pro-gramfor approxi mate3-D analysis of soil-structure interaction problems∥Report No.UCB/EERC75-30.Berkeley:Univer-sity of California,1975
[17]Pan D G,Lou ML,Fan L C,Computational model for nonlin-ear seismic response analysis of soil site under multi-support exci-tations.J Tongji Univ Nat Sci,2002,30(12):1411(潘旦光,楼梦麟,范立础.多点输入下场地非线性地震反应分析计算模型.同济大学学报:自然科学版,2002,30(12):1411)
[2]Wong H L,Trifunac M D.Scattering of plane SH waves by a semielliptical canyon.Earthquake Eng Struct Dyn,1974,3:157
[3]Wong HL,Jennings P C.Effects of canyontopography onstrong ground motion.Bull Seism Soc Am,1975,65:1239
[4]Yang B P,Yang X M.Seismic response of structures on complex sites.Earthquake Eng Eng Vib,1997,17(2):10(杨柏坡,杨笑梅.复杂场地上结构地震反应的研究.地震工程和工程振动,1997,17(2):10)
[5]Zhang C H,Zhao C B.Effects of canyonshape on plane SHwave scatterings.Chin J Geotech Eng,1990,12(1):1(张楚汉,赵崇斌.河谷形态对平面SH波散射的影响.岩土工程学报,1990,12(1):1)
[6]Li S Y,Liao Z P.Wave-type conversion caused by a step topog-raphy subjected to inclined seismic body wave.Earthquake Eng Eng Vib,2002,22(4):10(李山有,廖振鹏.地震体波斜入射情形下台阶地形引起的波型转换.地震工程和工程振动,2002,22(4):10)
[7]Nguyen K V,Gatmiri B.Evaluation of seismic ground motionin-duced by topographic irregularity.Soil Dyn Earthquake Eng,2007,27:183
[8]Kiureghian A D,Neuenhofer A.Response spectrum method for multi-support seismic excitations.Earthquake Eng Struct Dyn,1992,21:713
[9]Kiureghian A D,Neuenhofer A.Acoherency model for spatially varying ground motions.Earthquake Eng Struct Dyn,1996,25:99
[10]Liao Z P.Earthquake Microzonation:Theory and Pratice.Beijing:Seismological Press,1989(廖振鹏.地震小区划:理论与实践.北京:地震出版社,1989)
[11]Wang MS,Pan D G,Zhou Xiyuan.Soil-structure interaction analysis based on the soil lumped parameters model.J Univ Sci Technol Beijing,2007,29(1):5(王满生,潘旦光,周锡元.基于集总参数模型的土-结构动力相互作用分析.北京科技大学学报,2007,29(1):5)
[12]Lou ML,Fan Y Q,Ye AJ.Computation of site seismic re-sponse for Sutong Bridgein preli minary design phase.J Disaster Prev Mitig Eng,2007,27(4):429(楼梦麟,范么清,叶爱君.苏通大桥初设阶段主桥场地地震反应计算.防灾减灾工程学报,2007,27(4):429)
[13]Chopra A K.Dynamics of Structures:Theory and Applica-tions to Earthquake Engineering.Printice-Hall New Jersey,1995
[14]Lou M L,Pan D G,Fan L C.Effect of Vertical Artificial Boundary on Seismic Response of Soil Layer.JTongji Univ Nat Sci,2003,31(7):757(楼梦麟,潘旦光,范立础.土层地震反应分析中侧向人工边界影响的数值研究.同济大学学报:自然科学版,2003,31(7):757)
[15]Pan D G,Lou ML,Dong C.Effect of vertical artificial bound-ary on seismic response of soil layer under traveling wave excita-tions.Chin J Geotech Eng,2005,27(3):308(潘旦光,楼梦麟,董聪.土层地震行波反应分析中侧向人工边界的影响.岩土工程学报,2005,27(3):308)
[16]Lysmer J,Udaka T,Tshi C F,et al.Flush,a computer pro-gramfor approxi mate3-D analysis of soil-structure interaction problems∥Report No.UCB/EERC75-30.Berkeley:Univer-sity of California,1975
[17]Pan D G,Lou ML,Fan L C,Computational model for nonlin-ear seismic response analysis of soil site under multi-support exci-tations.J Tongji Univ Nat Sci,2002,30(12):1411(潘旦光,楼梦麟,范立础.多点输入下场地非线性地震反应分析计算模型.同济大学学报:自然科学版,2002,30(12):1411)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心