利用强震记录识别场地的总体非线性动力特性
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摘要
提出了一个以场地强地震动估计为目的的场地总体非线性动力特性识别方法。方法以一已知参考场地为基础,假定参考场地和待识别场地具有相同的基岩露头运动,根据参考场地和待识别场地地表强震和弱震记录,识别场地的总体非线性动力特性。以天津地区相邻的两个实际场地(一个作为参考场地,一个作为待识别场地)为例对场地总体非线性动力特性进行了识别。研究表明,方法能有效识别场地的总体非线性动力特性,识别的总体非线性动力特性可以实现场地强地震动的准确估计。
Estimation of nonlinear soil properties(the relation of dynamic shear modulus and damping ratio with shear strain) from downhole array recordings has been paid attention in recent years.However,because of the difficulty of downhole instrumentation,these studies have some limitation in their engineering application.For the purpose of prediction of strong earthquake ground motion of an engineering site with unknown soil properties(called unknown site),this paper,as an alternative,proposes a method of estimating the overall nonlinearity of an unknown site,in which,an adjacent reference site with known linear and nonlinear soil properties is introduced,and both the unknown site and the reference site are assumed to have the same bedrock outcrop motion,and only the weak and strong earthquake recordings at the surface of the unknown site and the reference site are used for the estimation.It is shown that the method can accurately estimates the overall nonlinearity of sites and predicts strong seismic ground motion,and the method can be directly applied to engineering practice.
Estimation of nonlinear soil properties(the relation of dynamic shear modulus and damping ratio with shear strain) from downhole array recordings has been paid attention in recent years.However,because of the difficulty of downhole instrumentation,these studies have some limitation in their engineering application.For the purpose of prediction of strong earthquake ground motion of an engineering site with unknown soil properties(called unknown site),this paper,as an alternative,proposes a method of estimating the overall nonlinearity of an unknown site,in which,an adjacent reference site with known linear and nonlinear soil properties is introduced,and both the unknown site and the reference site are assumed to have the same bedrock outcrop motion,and only the weak and strong earthquake recordings at the surface of the unknown site and the reference site are used for the estimation.It is shown that the method can accurately estimates the overall nonlinearity of sites and predicts strong seismic ground motion,and the method can be directly applied to engineering practice.
引文
[1]Elgamal A W,Zeghal M,Tang H T,et al.Lotung downhole array.I:evaluation of site dynamic properties[J].Journal of Geotechnical Engineering,ASCE,1995,121(4):350—362.
[2]Zeghal M,Elgamal A W,Tang H T,et al.Lotung downhole array.II:evaluation of soil nonlinear properties[J].Journal of Geotechnical Engineering,ASCE,1995,121(4):363—378.
[3]Tsai C C,Hashash Y M A.A novel framework integrating downhole array data and site response analysis to extract dynamic soil behavior[J].Soil Dynamic and Earthquake Engineering,2008,28:181—197.
[4]Tokimatsu K,Arai H.Nonlinear soil properties estimated from downhole array recordings at KashiwazakiKariwa nuclear power plant in the Niigata-Ken Chuetsu-Oki earthquakes[A].Proceedings of 14th World Conference on Earthquake Engineering[C],Beijing,2008,Paper No.04-01-0139.
[5]Satoh T,Horike M,Takeuchi Y,et al.Non-linear behavior of scoria evaluated from borehole records in eastern Shizuoka prefecture,Japan[J].Earthquake Engineering and Structural Dynamics,1997,26:781—795.
[6]Satoh T,Fushimi M,Tatsumi Y.Inversion of straindependent nonlinear characteristics of soils using weak and strong motions observed by borehole sites in Japan[J].Bulletin of Seismological Society of America,2001,91(2):365—380.
[7]Zhang R R,Van Demark L,Liang J,et al.On estimating site damping with soil nonlinearity from earthquake recordings[J].International Journal of Non—Linear Mechanics,2004,39(9):1 501—1 517.
[8]Zhang R R,Hartzell S,Liang J,et al.An alternative approach to characterize nonlinear site effects[J].Earthquake Spectra,2005,21(1):243—274.
[9]谢礼立,李沙白,章文波.唐山响嘡三维场地影响观测台阵[J].地震工程与工程振动,1999,19(2):1—8.Xie Lili,Li Shabai,Zhang Wenbo.A three dimensional array for site effects on strong ground motion[J].Journal of Earthquake Engineering and Engineering Vibration,1999,19(2):1—8.
[10]胡聿贤,张郁山,梁建文.应用HHT方法从竖向地震动记录识别场地液化的物理过程[J].地震工程与工程振动,2004,24(3):1—11.Hu Yuxian,Zhang Yushan,Liang Jianwen.Identification of physical process of site liquefaction from vertical seismic recordings via the method of HHT[J].Journal of Earthquake Engineering and Engineering Vibration,2004,24(3):1—11.
[11]Hu Y,Zhang Y,Liang J,et al.Recording-based identification of site liquefaction[J].Earthquake Engineering and Engineering Vibration,2005,4(2):181—189.
[12]胡聿贤,张郁山,梁建文.基于HHT方法的场地液化的识别[J].土木工程学报,2006,39(2):66—73.Hu Yuxian,Zhang Yushan,Liang Jianwen.HHTbased identification of site liquefaction[J].China Civil Engineering Journal,2006,39(2):66—73.
[13]孙锐,袁晓铭.基于强震记录快速识别场地液化的频率下降率法[J].岩土工程学报,2007,29(9):1 372—1 379.Sun Rui,Yuan Xiaoming.The method of frequency decrease rate for fast identification of site liquefaction from surface acceleration records[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1 372—1 379.
[14]赵昕,李杰.非线性参数结构系统的参数识别[J].振动与冲击,2004,23(1):113—117.Zhao Xin,Li Jie.Parameter estimation on nonlinear parametric structural system[J].Journal of Vibration and Shock,2004,23(1):113—117.
[15]蔡袁强,凌道盛,周迪永,等.非线性分层地基地面运动反演分析[J].振动工程学报,2000,13(3):426—432.Cai Yuanqiang,Ling Daosheng,Zhou Diyong,et al.Inverse calculational analysis of ground motion in nonlinear layered soil[J].Journal of Vibration Engineering,2000,13(3):426—432.
[16]Hardin B O,Drnevich V P.Shear modulus and damping in soils:design equations and curves[J].Journal of Soil Mechanics and Foundations Division,ASCE,1972,98(7):667—692.
[17]何颖.场地总体非线性动力特性识别方法[D].天津:天津大学,2011.He Ying.A method of estimating the site general nonlinear dynamic characteristics[D].Tianjin:Tianjin University,2011.
[2]Zeghal M,Elgamal A W,Tang H T,et al.Lotung downhole array.II:evaluation of soil nonlinear properties[J].Journal of Geotechnical Engineering,ASCE,1995,121(4):363—378.
[3]Tsai C C,Hashash Y M A.A novel framework integrating downhole array data and site response analysis to extract dynamic soil behavior[J].Soil Dynamic and Earthquake Engineering,2008,28:181—197.
[4]Tokimatsu K,Arai H.Nonlinear soil properties estimated from downhole array recordings at KashiwazakiKariwa nuclear power plant in the Niigata-Ken Chuetsu-Oki earthquakes[A].Proceedings of 14th World Conference on Earthquake Engineering[C],Beijing,2008,Paper No.04-01-0139.
[5]Satoh T,Horike M,Takeuchi Y,et al.Non-linear behavior of scoria evaluated from borehole records in eastern Shizuoka prefecture,Japan[J].Earthquake Engineering and Structural Dynamics,1997,26:781—795.
[6]Satoh T,Fushimi M,Tatsumi Y.Inversion of straindependent nonlinear characteristics of soils using weak and strong motions observed by borehole sites in Japan[J].Bulletin of Seismological Society of America,2001,91(2):365—380.
[7]Zhang R R,Van Demark L,Liang J,et al.On estimating site damping with soil nonlinearity from earthquake recordings[J].International Journal of Non—Linear Mechanics,2004,39(9):1 501—1 517.
[8]Zhang R R,Hartzell S,Liang J,et al.An alternative approach to characterize nonlinear site effects[J].Earthquake Spectra,2005,21(1):243—274.
[9]谢礼立,李沙白,章文波.唐山响嘡三维场地影响观测台阵[J].地震工程与工程振动,1999,19(2):1—8.Xie Lili,Li Shabai,Zhang Wenbo.A three dimensional array for site effects on strong ground motion[J].Journal of Earthquake Engineering and Engineering Vibration,1999,19(2):1—8.
[10]胡聿贤,张郁山,梁建文.应用HHT方法从竖向地震动记录识别场地液化的物理过程[J].地震工程与工程振动,2004,24(3):1—11.Hu Yuxian,Zhang Yushan,Liang Jianwen.Identification of physical process of site liquefaction from vertical seismic recordings via the method of HHT[J].Journal of Earthquake Engineering and Engineering Vibration,2004,24(3):1—11.
[11]Hu Y,Zhang Y,Liang J,et al.Recording-based identification of site liquefaction[J].Earthquake Engineering and Engineering Vibration,2005,4(2):181—189.
[12]胡聿贤,张郁山,梁建文.基于HHT方法的场地液化的识别[J].土木工程学报,2006,39(2):66—73.Hu Yuxian,Zhang Yushan,Liang Jianwen.HHTbased identification of site liquefaction[J].China Civil Engineering Journal,2006,39(2):66—73.
[13]孙锐,袁晓铭.基于强震记录快速识别场地液化的频率下降率法[J].岩土工程学报,2007,29(9):1 372—1 379.Sun Rui,Yuan Xiaoming.The method of frequency decrease rate for fast identification of site liquefaction from surface acceleration records[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1 372—1 379.
[14]赵昕,李杰.非线性参数结构系统的参数识别[J].振动与冲击,2004,23(1):113—117.Zhao Xin,Li Jie.Parameter estimation on nonlinear parametric structural system[J].Journal of Vibration and Shock,2004,23(1):113—117.
[15]蔡袁强,凌道盛,周迪永,等.非线性分层地基地面运动反演分析[J].振动工程学报,2000,13(3):426—432.Cai Yuanqiang,Ling Daosheng,Zhou Diyong,et al.Inverse calculational analysis of ground motion in nonlinear layered soil[J].Journal of Vibration Engineering,2000,13(3):426—432.
[16]Hardin B O,Drnevich V P.Shear modulus and damping in soils:design equations and curves[J].Journal of Soil Mechanics and Foundations Division,ASCE,1972,98(7):667—692.
[17]何颖.场地总体非线性动力特性识别方法[D].天津:天津大学,2011.He Ying.A method of estimating the site general nonlinear dynamic characteristics[D].Tianjin:Tianjin University,2011.
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