面波产生的地震动转动分量的试验验证
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摘要
迄今为止,地面运动转动分量主要是通过弹性波动理论方法间接由平动分量获得,但并未得到证实。首次运用面波试验验证了这种求取转动分量的方法的合理性。重锤击落地面,在半无限空间弹性介质的地表附近,可产生面波(瑞利波和乐夫波),合理布置拾振器位置,测得产生面波的时程,利用两点差原理可以测得地面近似转动分量;将实测转动分量和用理论方法求得的转动分量的时程曲线以及傅立叶谱进行对比,由两种方法得到的转动分量加速度时程在振动持续时间内的开始阶段、强震阶段和衰减阶段基本一致;Fourier谱峰值、峰值点个数、峰值出现的位置以及谱曲线的形状走向是接近的。
At present, the rotational components of earthquake motions are mainly obtained from the translational components based on the theory of elastic wave propagation. However, this method has not been confirmed by strong motion observations. Surface wave experiment was used to verify the theoretical method. The results show that the method to calculate the rotational components is rational and effective. The experiment was conducted using ground hammering. The ground was assumed to be elastic semi-infinite space. The surface waves (Rayleigh wave and Love wave) were derived at the ground surface using measuring equipments at different locations. The rotational components could then be obtained approximately using deferential method. Comparing between the experimental results and the theoretical ones using the time histories and Fourier spectra, it is concluded that the acceleration time histories in the two approaches were consistent in the full range of earthquake motion, and the amplitudes, the number of peak and the shapes of the spectra are also close to each other for the Fourier spectra.
At present, the rotational components of earthquake motions are mainly obtained from the translational components based on the theory of elastic wave propagation. However, this method has not been confirmed by strong motion observations. Surface wave experiment was used to verify the theoretical method. The results show that the method to calculate the rotational components is rational and effective. The experiment was conducted using ground hammering. The ground was assumed to be elastic semi-infinite space. The surface waves (Rayleigh wave and Love wave) were derived at the ground surface using measuring equipments at different locations. The rotational components could then be obtained approximately using deferential method. Comparing between the experimental results and the theoretical ones using the time histories and Fourier spectra, it is concluded that the acceleration time histories in the two approaches were consistent in the full range of earthquake motion, and the amplitudes, the number of peak and the shapes of the spectra are also close to each other for the Fourier spectra.
引文
[1]李宏男.结构多维抗震理论与设计方法[M].北京:科学出版社,1998.Li Hongnan.Theoretical analysis and design of structures to multiple earthquake excitations[M].Beijing:Science Press,1998.(in Chinese)
[2]Li Hongnan,Sun Liye,Wang Suyan.Improved approach for obtaining rotational components of seismic motion[J].Nuclear Engineering and Design,2004,232(2):131~137.
[3]Li Hongnan,Sun Liye,Wang Suyan.Frequency dispersion characteristics of phase velocities in surface wave for rotational components of seismic motion[J].Journal of Sound and Vibration,2002,258(5):815~827.
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[6]孙士军,陈国兴地面运动转动分量的合成方法[J].地震学刊,1998,1:19~24.Sun Shijun,Chen Guoxing.The synthetic method of rotational components of earthquake ground motions[J].Journal of Seismology,1998,1:19~24.(in Chinese)
[7]王君杰,胡聿贤.地震动旋转分量的研究[J].地震工程与工程振动,1991,11(2):1~10.Wang Junjie,Hu Yuxian.Rotational components of earthquake ground motions[J].Earthquake Engineering and Structure Dynamics,1991,11(2):1~10.(in Chinese)
[8]薛素铎,赵均.建筑抗震设计[M].北京:科学出版社,2003.Xue Suduo,Zhao Jun.Seismic design of buildings[M].Beijing:Science Press,2003.(in Chinese)
[9]胡聿贤.地震工程学[M].北京:地震出版社,1988.Hu Yuxian.Earthquake engineering[M].Beijing:China Seismology Press,1988.(in Chinese)
[10]Li Hongnan,Suarez L E,Singh M P.Rotational components of earthquake ground motions[J].Earthquake Engineering and Structure Dynamics,1997,17(2):37~50.
[11]王雪生,薛素铎,曹资.结构多维地震作用研究综述及展望-地震动输入[J].世界地震工程,2001,17(4):27~33.Wang Xuesheng,Xue Suduo,Cao Zi.Review and pro-spects of the research on multi-components earthquake excitation for structures(I):seismic inputs[J].World Information on Earthquake Engineering,2001,17(4):27~33.(in Chinese)
[12]李宏男.结构多维地震反应分析[D].哈尔滨:国家地震局工程力学研究所,1990.Li Hongnan.Analysis of structures to multiple earthquake excitations[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,1990.(in Chinese)
[2]Li Hongnan,Sun Liye,Wang Suyan.Improved approach for obtaining rotational components of seismic motion[J].Nuclear Engineering and Design,2004,232(2):131~137.
[3]Li Hongnan,Sun Liye,Wang Suyan.Frequency dispersion characteristics of phase velocities in surface wave for rotational components of seismic motion[J].Journal of Sound and Vibration,2002,258(5):815~827.
[4]李宏男,孙立晔.地震面波产生的地震动转动分量研究[J].地震工程与工程振动,2001,21(1):15~23.Li Hongnan,Sun Liye.Rotational components of earthquake ground motions derived from surface waves[J].Earthquake Engineering and Structure Dynamics,2001,21(1):15~23.(in Chinese)
[5]Trifunac M D.A note on rotational components of earthquake motions on ground surface for incident body waves[J].Soil Dynamics and Earthquake Engineering,1982,1(1):11~19.
[6]孙士军,陈国兴地面运动转动分量的合成方法[J].地震学刊,1998,1:19~24.Sun Shijun,Chen Guoxing.The synthetic method of rotational components of earthquake ground motions[J].Journal of Seismology,1998,1:19~24.(in Chinese)
[7]王君杰,胡聿贤.地震动旋转分量的研究[J].地震工程与工程振动,1991,11(2):1~10.Wang Junjie,Hu Yuxian.Rotational components of earthquake ground motions[J].Earthquake Engineering and Structure Dynamics,1991,11(2):1~10.(in Chinese)
[8]薛素铎,赵均.建筑抗震设计[M].北京:科学出版社,2003.Xue Suduo,Zhao Jun.Seismic design of buildings[M].Beijing:Science Press,2003.(in Chinese)
[9]胡聿贤.地震工程学[M].北京:地震出版社,1988.Hu Yuxian.Earthquake engineering[M].Beijing:China Seismology Press,1988.(in Chinese)
[10]Li Hongnan,Suarez L E,Singh M P.Rotational components of earthquake ground motions[J].Earthquake Engineering and Structure Dynamics,1997,17(2):37~50.
[11]王雪生,薛素铎,曹资.结构多维地震作用研究综述及展望-地震动输入[J].世界地震工程,2001,17(4):27~33.Wang Xuesheng,Xue Suduo,Cao Zi.Review and pro-spects of the research on multi-components earthquake excitation for structures(I):seismic inputs[J].World Information on Earthquake Engineering,2001,17(4):27~33.(in Chinese)
[12]李宏男.结构多维地震反应分析[D].哈尔滨:国家地震局工程力学研究所,1990.Li Hongnan.Analysis of structures to multiple earthquake excitations[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,1990.(in Chinese)
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