等效线性化地震反应的震级距离参数调整法及其在地震安全性评价中的应用
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摘要
传统等效线性化波动法最主要的缺陷之一是,当基岩输入地震动较强时,高频段算得的放大倍率比实际场地的实测结果明显偏低。在地震安全性评价中,该缺陷导致了低估重大工程设计地震动参数的严重后果。为弥补等效线性化方法的上述缺陷,沈建文等(2010)提出了通过震级M和距离R参数修正等效线性化的方法EQLM(M,R)。本文指出应变折减系数对计算结果的重要影响,对土层反应的等效线性化方法EQLM(M,R)做了进一步的讨论。同时结合地震安全性评价的算例,用设定地震确定了震级-距离,用EQLM(M,R)完成了土层反应的计算。
One of the critical shortcomings by traditional equivalent linear method (EQLM) is that when large motions are input, the magnification of high frequency components calculated is obviously lower than that observed. In seismic safety evaluation, such defect may lead to a serious result of underestimating design ground motion parameters for key projects. In 2010, Shen Jianwen and etc. suggested a EQLM (M, R) method to improve EQLM through parameters of magnitudes and distances. In this paper we point out the important effect of the strain discount coefficient to the computation result, and discuss equivalent linear method EQLM (M, R) further. Taking a seismic safety evaluation project as an example, we determine magnitude-distance pairs with the concept of scenario earthquake, and calculate the soil seismic response.
One of the critical shortcomings by traditional equivalent linear method (EQLM) is that when large motions are input, the magnification of high frequency components calculated is obviously lower than that observed. In seismic safety evaluation, such defect may lead to a serious result of underestimating design ground motion parameters for key projects. In 2010, Shen Jianwen and etc. suggested a EQLM (M, R) method to improve EQLM through parameters of magnitudes and distances. In this paper we point out the important effect of the strain discount coefficient to the computation result, and discuss equivalent linear method EQLM (M, R) further. Taking a seismic safety evaluation project as an example, we determine magnitude-distance pairs with the concept of scenario earthquake, and calculate the soil seismic response.
引文
蔡长青,沈建文,2001.抛物线内插反应谱计算方法.世界地震工程,17(1):87—92.
蒋通,邢海灵,2007.水平土层地震反应分析考虑频率相关性的等效线性化方法.岩土工程学报,29(2):218—224.
廖振鹏,李小军,1989.地表土层地震反应分析的等效线性化解法.见:地震小区划——理论与实践.北京:地震出版社,141—153.
刘峥,2009.用震级和距离参数修正等效线性化波动方法的研究[博士论文].上海:同济大学.
沈建文,蔡长青,邱瑛,1997.XQH1.00地震安全性评价工作程序包简介.地震学刊,(1):46—51.
沈建文,余湛,石树中,2007.地震安全性评价时程的包线与设定地震.震灾防御技术,2(2):201—206.
沈建文,刘峥,石树中,2010.用震级和距离参数修正土层反应的等效线性化方法.地震学报,32(4):466—475.
石树中,沈建文,2003.上海及邻近地区地震动衰减关系研究.中国地震,19(4):315—323.
Bardet J.P.,Ichii K.,Lin C.H.,2000.EERA:A computer program for equivalent-linear earthquake site response analysis of layered soil deposits.Los Angeles:University of Southern California,C.A.
Furumoto Y.,Sugito M.,Yashima A.,2002.Frequency-dependent equivalent linearized technique for FEM response analysis of ground.12th WCEE(CD-ROM),Auckland,New Zealand.
Hartzell S.,Bonilla L.F.and Robert A.Williams,2004.Prediction of nonlinear soil effects.Bulletin of the Seismological Society of America,94(5):1609—1629.
Idriss I.M.,Sun J.I.,1992.User's manual for SHAKE91:a computer program for conducting equivalent linear seismic response analysis of horizontally layered siol deposits.University of California,Davis,CA:Department of Civil Engineering Technical Report.
Kausel E.,Assimaki D.,2002.Seismic simulation of inelastic soils via frequency-dependent modul and damping.Journal of Engineering Mechanics,ASCE,128(1):34—45.
Schnabel P.B.,Lysmer J.,Seed H.B.,1972.SHAKE:a computer program for earthquake response analysis of horizontally layered sites.Report No.EERC72-12:University of California,Berkeley.
Yoshida N.,Kobayashi S.,Suetomi I.et al.,2002.Equivalent linear method considering frequency dependent characteristics of stiffness and damping.Soil Dynamics and Earthquake Engineering,22:205—222.
蒋通,邢海灵,2007.水平土层地震反应分析考虑频率相关性的等效线性化方法.岩土工程学报,29(2):218—224.
廖振鹏,李小军,1989.地表土层地震反应分析的等效线性化解法.见:地震小区划——理论与实践.北京:地震出版社,141—153.
刘峥,2009.用震级和距离参数修正等效线性化波动方法的研究[博士论文].上海:同济大学.
沈建文,蔡长青,邱瑛,1997.XQH1.00地震安全性评价工作程序包简介.地震学刊,(1):46—51.
沈建文,余湛,石树中,2007.地震安全性评价时程的包线与设定地震.震灾防御技术,2(2):201—206.
沈建文,刘峥,石树中,2010.用震级和距离参数修正土层反应的等效线性化方法.地震学报,32(4):466—475.
石树中,沈建文,2003.上海及邻近地区地震动衰减关系研究.中国地震,19(4):315—323.
Bardet J.P.,Ichii K.,Lin C.H.,2000.EERA:A computer program for equivalent-linear earthquake site response analysis of layered soil deposits.Los Angeles:University of Southern California,C.A.
Furumoto Y.,Sugito M.,Yashima A.,2002.Frequency-dependent equivalent linearized technique for FEM response analysis of ground.12th WCEE(CD-ROM),Auckland,New Zealand.
Hartzell S.,Bonilla L.F.and Robert A.Williams,2004.Prediction of nonlinear soil effects.Bulletin of the Seismological Society of America,94(5):1609—1629.
Idriss I.M.,Sun J.I.,1992.User's manual for SHAKE91:a computer program for conducting equivalent linear seismic response analysis of horizontally layered siol deposits.University of California,Davis,CA:Department of Civil Engineering Technical Report.
Kausel E.,Assimaki D.,2002.Seismic simulation of inelastic soils via frequency-dependent modul and damping.Journal of Engineering Mechanics,ASCE,128(1):34—45.
Schnabel P.B.,Lysmer J.,Seed H.B.,1972.SHAKE:a computer program for earthquake response analysis of horizontally layered sites.Report No.EERC72-12:University of California,Berkeley.
Yoshida N.,Kobayashi S.,Suetomi I.et al.,2002.Equivalent linear method considering frequency dependent characteristics of stiffness and damping.Soil Dynamics and Earthquake Engineering,22:205—222.
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