地下地震动工程特性分析
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摘要
为考察地下地震动的工程特性,选取美国加州强震观测计划(CSMIP)6个土工台阵的120条三分量地表和地下地震动为数据基础,分别对水平向和竖直向地震动的加速度幅值,规准反应谱,双规准反应谱,傅立叶谱,持时等工程特征进行了研究。结果表明,地震动加速度幅值随深度的增加而减小,在浅层的变化速度较快。规准反应谱明显受到场地条件和深度的影响。而不同场地不同深度不同分量方向的双规准反应谱之间差别甚小,双规准反应谱比规准反应谱表现出良好的一致性。最后,讨论了土层/基岩场地上台阵地震动的傅立叶幅值谱和地震动持时沿深度变化的特点。本研究揭示了地下地震动的一些工程特性,可以为地下工程结构的抗震设计提供参考依据。
To study the engineering characteristics of sub-ground motions,three components of 120 ground motions on surface and in subsoil recorded by six CSMIP geotechnical arrays of the United States from 28 earthquakes were analyzed.The variations of amplitude of earthquake acceleration,normalized response spectrum(NRS) and bi-normalized response spectrum(BNRS) with depth were evaluated.It was concluded that,the amplitude of acceleration of ground motions decreased with depth and the attenuation rate was higher in the shallow strata than that in deeper ones.NRS was strongly related to site conditions and depth,while the BNRS had better consistency among all strong motion records than the conventional NRS under the influence of site condition,depth and motion component.Additionally,features of Fourier amplitude spectrum and variation of duration of ground motions with depth in Treasure Island were discussed.This study not only revealed the engineering characteristics of sub-ground motions,but also provided criterion in determining the seismic design for embedded structures and pipelines.
To study the engineering characteristics of sub-ground motions,three components of 120 ground motions on surface and in subsoil recorded by six CSMIP geotechnical arrays of the United States from 28 earthquakes were analyzed.The variations of amplitude of earthquake acceleration,normalized response spectrum(NRS) and bi-normalized response spectrum(BNRS) with depth were evaluated.It was concluded that,the amplitude of acceleration of ground motions decreased with depth and the attenuation rate was higher in the shallow strata than that in deeper ones.NRS was strongly related to site conditions and depth,while the BNRS had better consistency among all strong motion records than the conventional NRS under the influence of site condition,depth and motion component.Additionally,features of Fourier amplitude spectrum and variation of duration of ground motions with depth in Treasure Island were discussed.This study not only revealed the engineering characteristics of sub-ground motions,but also provided criterion in determining the seismic design for embedded structures and pipelines.
引文
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[5]徐龙军,谢礼立.场地相关双规准化地震动加速度反应谱[J].哈尔滨工业大学学报,2004,36(8):1061–1064.(XU Long-jun,XIE Li-li.Site-dependent bi-normalized earth-quake acceleration response spectra[J].Journal of Harbin Institute of Technology,2004,36(8):1061–1064.)
[6]XU Long-jun,XIE Li-li.Bi-normalized response spectral characteristics of the Ci-Ci earthquake[J].Earthquake Engineering and Engineering Vibration,2004,3(2):147–155.
[7]GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.(GB50011—2001 Code for seismic design of buildings[S].Beijing:China Building Industry Publisher,2001.)
[8]SEED H B,UGAS,C,LYSMER J.Site-dependent spectra for earthquake resistance design[J].BSSA,1976,66(1):221–243.
[9]周锡元,王广军,等.场地分类和平均反应谱[J].岩土工程学报,1984,6(5):59–68.(ZHOU Xi-yuan,WANG Guang-jun,et al.Site classification and average response spectra[J].Chinese Journal of Geotechnical Engineering,1984,6(5):59–68.)
[10]TRIFUNAC M D,BRADY A G.A study of the duration of strong earthquake ground motion[J].BSSA,1975,65:581–626.
[2]GRAIZER V M,CAO T,SHAKAL A F,et al.Data from dwnhole arrays istrumented by the California srong motion istrumentation program in studies of site applification efects[C]//Proceedings of the 6th International Conference on Seismic Zonation,California:EERI,2000:1–10.
[3]TENG Ta-liang,LI Sha-bai,et al.Attenuation of strong ground motion with depth-observation from the Tangshan array[C]//California Institute of Technology.Proceedings of the Sino-American Workshop on Strong-Motion Measurement.Pasadena,CA:California Institute of Technology,1989:74–90.
[4]谢礼立,于双久.强震观测与分析原理[M].北京:地震出版社,1982,214–230.(XIE Li-li,YU Shuang-jiu.The theory of strong earthquake motion measurement and analysis[M].Beijing:Seismological Press,1982,214–230.)
[5]徐龙军,谢礼立.场地相关双规准化地震动加速度反应谱[J].哈尔滨工业大学学报,2004,36(8):1061–1064.(XU Long-jun,XIE Li-li.Site-dependent bi-normalized earth-quake acceleration response spectra[J].Journal of Harbin Institute of Technology,2004,36(8):1061–1064.)
[6]XU Long-jun,XIE Li-li.Bi-normalized response spectral characteristics of the Ci-Ci earthquake[J].Earthquake Engineering and Engineering Vibration,2004,3(2):147–155.
[7]GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.(GB50011—2001 Code for seismic design of buildings[S].Beijing:China Building Industry Publisher,2001.)
[8]SEED H B,UGAS,C,LYSMER J.Site-dependent spectra for earthquake resistance design[J].BSSA,1976,66(1):221–243.
[9]周锡元,王广军,等.场地分类和平均反应谱[J].岩土工程学报,1984,6(5):59–68.(ZHOU Xi-yuan,WANG Guang-jun,et al.Site classification and average response spectra[J].Chinese Journal of Geotechnical Engineering,1984,6(5):59–68.)
[10]TRIFUNAC M D,BRADY A G.A study of the duration of strong earthquake ground motion[J].BSSA,1975,65:581–626.
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