空间地震动场的相干性研究
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摘要
地震动的空间变化受震源破裂过程、传播途径和场地条件等因素影响,目前地震动场的相干性研究大多是用台阵实测数据,不具有普适性。采用震源位错模型,利用数值方法模拟均匀单一介质随机地震动场的理论地震图,通过对大量计算数据的分析,研究地表地震动场的空间相干性。分析结果表明:数值模拟结果所反应的地震动空间相干性规律与实测数据所反应的规律基本吻合,表明该分析方法和模型的合理性。同时空间地震动场相干性随地震波的传播方向存在各向异性,断层走向是空间地震动场相干性的重要影响因素。该方法是对地震动场相干性具有普适性的一个尝试。
By using dislocation model of seismic source, the theoretical seismogram of random earthquake motion field in homogeneous and single medium was simulated numerically. Spatial coherence of surface earthquake motion field was investigated, based on a great deal of calculated and analysed data. The results show that the laws regarding spatial coherence of ground motion reflected in numerical simulation results basically accord with those reflected in measured data, which indicates that the analysis method and model adopted are reasonable. Besides, anisotropy exists in spatial coherence of ground motion in the propagation direction of seismic wave, and fault strike is an important influencial factor affecting spatial coherence of ground motion.
By using dislocation model of seismic source, the theoretical seismogram of random earthquake motion field in homogeneous and single medium was simulated numerically. Spatial coherence of surface earthquake motion field was investigated, based on a great deal of calculated and analysed data. The results show that the laws regarding spatial coherence of ground motion reflected in numerical simulation results basically accord with those reflected in measured data, which indicates that the analysis method and model adopted are reasonable. Besides, anisotropy exists in spatial coherence of ground motion in the propagation direction of seismic wave, and fault strike is an important influencial factor affecting spatial coherence of ground motion.
引文
[1]胡聿贤著.地震工程学[M].北京:地震出版社,2006.
[2]Wang G Q,Zhou X Y,Zhang P.Characteristics of amplitude and duration for near fault strong ground motion from the1999Chi-Chi,Taiwan earthquake[J].Soil Dynamics and Earth-quake Engineering,2002,22(1):73-96.
[3]刘先明,叶继红,李爱群.竖向地震动场的空间相干函数模型[J].工程力学.2004,21(2):140-144.
[4]NiaziM,Bozorgnia Y M.Behavior of near source vertical and horizontal response at anay,Taiwan[J]SMART-1.EESD,1992,21:37-50.
[5]Hao H,Oliveira C S,Penzien J.Multiple-station ground mo-tion processing and simulation based on SMART-1array date[J].Nuclear Engineering and Design,1989,111(3):293-310.
[6]Horike M,Takeuchi Y.Possibility of spatial variation of high-frequency seismic motions due to random-velocity fluctuation of sediments[J].Bulletin of the Seismological Society of A-merica,2000,90(1):48-65.
[7]Harichandran R S.Response of long-span bridges to spatially varying ground motion[J].Jouranl of Structural Engineering,1996,122(5):
[8]贺秋梅,闫维明,董娣.震源机制和场地条件对近场强震地面运动特性的影响[J].地震研究,2006,29(3):256-267.
[9]Zerva A,Harada T.Effects of surface layer stochasticity on seismic ground motion coherence and strain estimates[J].Soil Dynamics and Earthquake Engineering,1997,16:445-57.
[10]Der Kiureghian A.A coherency model for spatially varying ground motions[J].Earthquake Engineering and Structural Dynamics,1996,25(1):99-111.
[11]Laouami N,Labbe P.Analytical approach for evaluation of the seismic ground motion coherency function[J].Soil Dy-namics and Earthquake Engineering,2001,21(8):727-733.
[12]丁海平,刘启方,金星.基岩地震动的一个相干函数模型——走滑断层情形[J].地震学报,2004,26(1):62-67.
[13]Bozorgnia Y M,Niazi M.Characteristics of free field vertical ground motion during the Northridge earthquakes[J].Earth-quake spectra,1995,11:515-525.
[14]Babak A,Krawinkler H.Consideration of near-fault ground motion effects in seismic design[A].12WCEE[C],2000,2665:1-8.
[15]袁一凡,廖振鹏.弹性半空间位错内源的数值解[J].地震学报,1984,6(3):324-339.
[16]廖振鹏.工程波动理论导引(第二版)[M].北京:科学出版社,2002.
[17]大崎顺彦著.吕敏申,谢礼力译.地震动谱分析入门[M].北京:地震出版社,1980.
[2]Wang G Q,Zhou X Y,Zhang P.Characteristics of amplitude and duration for near fault strong ground motion from the1999Chi-Chi,Taiwan earthquake[J].Soil Dynamics and Earth-quake Engineering,2002,22(1):73-96.
[3]刘先明,叶继红,李爱群.竖向地震动场的空间相干函数模型[J].工程力学.2004,21(2):140-144.
[4]NiaziM,Bozorgnia Y M.Behavior of near source vertical and horizontal response at anay,Taiwan[J]SMART-1.EESD,1992,21:37-50.
[5]Hao H,Oliveira C S,Penzien J.Multiple-station ground mo-tion processing and simulation based on SMART-1array date[J].Nuclear Engineering and Design,1989,111(3):293-310.
[6]Horike M,Takeuchi Y.Possibility of spatial variation of high-frequency seismic motions due to random-velocity fluctuation of sediments[J].Bulletin of the Seismological Society of A-merica,2000,90(1):48-65.
[7]Harichandran R S.Response of long-span bridges to spatially varying ground motion[J].Jouranl of Structural Engineering,1996,122(5):
[8]贺秋梅,闫维明,董娣.震源机制和场地条件对近场强震地面运动特性的影响[J].地震研究,2006,29(3):256-267.
[9]Zerva A,Harada T.Effects of surface layer stochasticity on seismic ground motion coherence and strain estimates[J].Soil Dynamics and Earthquake Engineering,1997,16:445-57.
[10]Der Kiureghian A.A coherency model for spatially varying ground motions[J].Earthquake Engineering and Structural Dynamics,1996,25(1):99-111.
[11]Laouami N,Labbe P.Analytical approach for evaluation of the seismic ground motion coherency function[J].Soil Dy-namics and Earthquake Engineering,2001,21(8):727-733.
[12]丁海平,刘启方,金星.基岩地震动的一个相干函数模型——走滑断层情形[J].地震学报,2004,26(1):62-67.
[13]Bozorgnia Y M,Niazi M.Characteristics of free field vertical ground motion during the Northridge earthquakes[J].Earth-quake spectra,1995,11:515-525.
[14]Babak A,Krawinkler H.Consideration of near-fault ground motion effects in seismic design[A].12WCEE[C],2000,2665:1-8.
[15]袁一凡,廖振鹏.弹性半空间位错内源的数值解[J].地震学报,1984,6(3):324-339.
[16]廖振鹏.工程波动理论导引(第二版)[M].北京:科学出版社,2002.
[17]大崎顺彦著.吕敏申,谢礼力译.地震动谱分析入门[M].北京:地震出版社,1980.
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