高山峡谷地区大型地下洞室群非平稳人工地震动拟合
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摘要
基于近场地震记录频谱分析,结合地震危险性分析得到的基岩场地反应谱,进行了高山峡谷地区大型地下洞室群的人工地震动加速度时程的合成。该方法使用三角级数迭加法,利用攀枝花地震动记录进行傅里叶变换,得到离散点的傅里叶幅值谱,选择两个卓越频率作为控制傅里叶谱的峰值控制点,通过反复迭代生成了初始人工地震波,根据高山峡谷地形进行了深度修正、基线校正和高频滤波,最终生成了可以用于FLAC和ABAQUS等数值分析软件的人工地震动加速度-时程。数值分析表明,此方法拟合的人工地震波可以较好地反映不同频谱对地下洞室群强震响应的影响。
The nonstationary seismic motion for large-scale underground cavern group located in alpine gorge is artificially simulated,based on the frequency analysis of near-site seismic log and bedrock response spectrum obtained by seismic hazard analysis.The trigonometric series superposition,under the control of two predominant frequencies by the Fourier transform of Panzhihua earthquake records,is used to simulate the seismic motion with consideration of depth modification,baseline modification and high frequency wave.The other earthquake log with similar geological background is also used to get the frequency spectrum if the near-site earthquake log is absent.The finished artificial seismic motions,as the numerical simulations show,fit the numerical analysis softwares such as FLAC and ABAQUS well.
The nonstationary seismic motion for large-scale underground cavern group located in alpine gorge is artificially simulated,based on the frequency analysis of near-site seismic log and bedrock response spectrum obtained by seismic hazard analysis.The trigonometric series superposition,under the control of two predominant frequencies by the Fourier transform of Panzhihua earthquake records,is used to simulate the seismic motion with consideration of depth modification,baseline modification and high frequency wave.The other earthquake log with similar geological background is also used to get the frequency spectrum if the near-site earthquake log is absent.The finished artificial seismic motions,as the numerical simulations show,fit the numerical analysis softwares such as FLAC and ABAQUS well.
引文
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[3]陈厚群,李敏,张艳红.300 m级高拱坝抗震技术研究——地震危险性分析和地震输入机制研究成果汇编[R].北京:中国水利水电科学研究院,1996.
[4]胡进军.地下地震动参数研究[硕士学位论文D].哈尔滨:中国地震局工程力学研究所,2003.
[5]胡聿贤.地震工程学[M].北京:地震出版社,2006.
[6]BOMMER J J,MARTINEZ-PEREIRA A.The effective duration of earthquake strong motion[J].Journal of Earthquake Engineering,1999,3(2):127-172.
[7]BOORE D M,ATKINSON G M.Ground-motion prediction equations for the average horizontal component of PGA,PGV,and 5%-damped PSA at spectral periods between 0.01 and 10.0 s[J].Earthquake Spectra,2008,24(1):99-138.
[8]CHIOU BS-J,YOUNGS R R.An NGA model for the average horizontal component of peak ground motion and response spectra[J].Earthquake Spectra,2008,24(1):173-215.
[9]REZAEIAN S,KIUREGHIAN A D.A stochastic ground motion model with separable temporal and spectral nonstationarities[J].Earthquake Engineering and Structural Dynamics,2008,37:1565-1584.
[10]大崎顺彦.地震动的谱分析入门[M].吕敏申,谢礼立译.北京:地震出版社,1980.
[11]翟希梅,吴知丰.人工地震波反应谱拟合技术的改进[J].哈尔滨工业大学学报,1995,27(6):130-133.
[12]陈厚群,李敏,张艳红.地震危险性分析和地震动输入机制研究[J].水力发电,2001,(8):48-50.
[13]YANG J,LI J B,LIN G.A simple approach to integration of acceleration data for dynamic soil-structure interaction analysis[J].Soil Dynamics and Earthquake Engineering,2005:1-10.
[14]王树仁,何满潮,武崇福,等.复杂工程条件下边坡工程稳定性研究[M].北京:科学出版社,2007.
[15]徐明远.MATLAB仿真在信号处理中的应用[M].西安:西安电子科技大学出版社,2007.
[16]霍俊荣.近场强地面运动衰减规律的研究[博士学位论文D].北京:国家地震局工程力学研究所,1989.
[17]TRAVASAROU T,BRAY J D,ABRAHAMSON N A.Empirical attenuation relationship for arias intensity[J].Earthquake Engineering and Structural Dynamics,2003,32:1133-1155.
[18]四川省地震局工程地震研究院,中国地震局地质研究所,中国地震局地球物理研究所.四川省大渡河大岗山水电站工程场地地震安全性评价报告[R].成都:四川地震局工程地震研究院,2004.
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