近断层脉冲型地震动耦合效应特征
|
摘要
指出了近断层脉冲型地震动耦合效应的存在。以典型走滑断层型地震动为数据基础,考虑场地条件的影响,对近断层方向性效应地震动分量(CFN)、滑冲效应地震动分量(CFP)以及相互垂直的两耦合地震动分量(C45°和C-45°)的峰值、反应谱分别做了定性的比较。结果表明,各地震动分量的加速度峰值之间差别不明显,但方向性效应地震动分量的速度和位移峰值明显大于其它分量相应的峰值;不同场地、不同周期段的绝对加速度、相对速度和相对位移反应谱谱比呈现不同的变化特点;岩石场地上方向性效应地震动分量长周期段的加速度反应谱最高,而土层场地上各分量加速度反应谱之间的差别不大;近断层结构抗震设计时,地震动分量和设计谱的选取应适当考虑地震动的方向效应。
The existence of near-fault coupling effects in pulse-like ground motions is pointed out. On the basis of typical strike-slip earthquake ground motions,the relations of ground motion amplitudes and response spectra between forward-directivity effect component (CFN),fling-step effect component (CFP) and two orthogonal coupling components (C45°,C-45°) are analyzed by considering the influence of site conditions. The result shows that,the differences of peak ground acceleration between different components are slight,while peak ground velocity and displacement of CFN component are both significantly higher than those of the other components. Absolute acceleration,relative velocity and relative displacement response spectra ratios all exhibit different characteristics with the varieties of site conditions and period ranges; for rock site,acceleration spectrum of CFN component is the highest at long period range than those of the other components,while the differences of acceleration spectra for the components at soil site are negligible. The effects of component direction should be properly considered in the section of ground motion and design spectra for seismic design of structures in the near-fault region.
The existence of near-fault coupling effects in pulse-like ground motions is pointed out. On the basis of typical strike-slip earthquake ground motions,the relations of ground motion amplitudes and response spectra between forward-directivity effect component (CFN),fling-step effect component (CFP) and two orthogonal coupling components (C45°,C-45°) are analyzed by considering the influence of site conditions. The result shows that,the differences of peak ground acceleration between different components are slight,while peak ground velocity and displacement of CFN component are both significantly higher than those of the other components. Absolute acceleration,relative velocity and relative displacement response spectra ratios all exhibit different characteristics with the varieties of site conditions and period ranges; for rock site,acceleration spectrum of CFN component is the highest at long period range than those of the other components,while the differences of acceleration spectra for the components at soil site are negligible. The effects of component direction should be properly considered in the section of ground motion and design spectra for seismic design of structures in the near-fault region.
引文
[1]Yu Y X,Gao M T.Effects of the hanging wall and footwall on peak acceleration during the Jiji(Chi-Chi),Taiwan Province,Earthquake[J].Acta Seis-mologica Sinica,2004,14(6):654-659.
[2]刘启方,袁一凡,金星,等.近断层地震动的基本特征[J].地震工程与工程振动,2006,26(1):1-10.Liu Q F,Yuan Y F,Jin X,et al.Basic characteristics of near-fault ground motion[J].Earthquake Engi-neering and Engineering Vibration,2006,26(1):1-10.
[3]李新乐,朱.近断层地震动等效速度脉冲研究[J].地震学报,2004,26(6):634-643.Li X L,Zhu X.Study on equivalent velocity pulse of near-fault ground motions[J].Acta Seismologica Sini-ca,2004,26(6):634-643.
[4]Wei T,Zhao F X,Zhang Y S.Characteristics of near-fault ground motion containing velocity pulses[J].Acta Seismologica Sinica,2006,16(6):677-686.
[5]李爽,谢礼立.近场问题的研究与发展方向[J].地震学报,2007,29(1):102-111.Li S,Xie L L.Progress and trend on near-field prob-lems in civil engineering[J].Acta Seismologica Sini-ca,2007,29(1):102-111.
[6]Wang G Q,Zhou X Y,Zhang P Z,et al.Characteris-tics of amplitude and during for near fault strong ground motion from the1999Chi-Chi,Taiwan Earth-quake[J].Soil Dynamics and Earthquake Engineer-ing,2002,(22):73-96.
[7]Hall J F,Heaton T H,Halling M W,et al.Near-source ground motions and its effects on flexible buildings[J].Earthquake Spectra,1995,11(4):569-605.
[8]Mavroeidis G P,Dong G,Papageorgiou A S.Near-fault ground motions,and the response of elastic and inelastic Single-Degree-of-Freedom(SDOF)Systems[J].Earthquake Engineering Structural Dynamics,2004,(33):1023-1049.
[9]Bray J D,Rodriguez-Marek A.Characterization of forward-directivity ground motions in the near-fault region[J].Soil Dynamics and Earthquake Engineer-ing,2004,(24):815-828.
[10]Dai J W,Tong M,Lee G C,et al.Dynamic respons-es under the excitation of pulse sequences[J].Earth-quake Engineering and Engineering Vibration,2004,3(2):157-169.
[11]Xu L J,Rodriguez-Marek A,Xie L L.Design spectra including effect of rupture directivity in near-fault re-gion[J].Earthquake Engineering and Engineering Vi-bration,2006,5(2):159-170.
[12]Alavi B,Krawinkler H.Consideration of near-fault ground motion effects in seismic design[C]∥Preceed-ings of the12WCEE,New Zealand:[s.n.]2000.2665.
[2]刘启方,袁一凡,金星,等.近断层地震动的基本特征[J].地震工程与工程振动,2006,26(1):1-10.Liu Q F,Yuan Y F,Jin X,et al.Basic characteristics of near-fault ground motion[J].Earthquake Engi-neering and Engineering Vibration,2006,26(1):1-10.
[3]李新乐,朱.近断层地震动等效速度脉冲研究[J].地震学报,2004,26(6):634-643.Li X L,Zhu X.Study on equivalent velocity pulse of near-fault ground motions[J].Acta Seismologica Sini-ca,2004,26(6):634-643.
[4]Wei T,Zhao F X,Zhang Y S.Characteristics of near-fault ground motion containing velocity pulses[J].Acta Seismologica Sinica,2006,16(6):677-686.
[5]李爽,谢礼立.近场问题的研究与发展方向[J].地震学报,2007,29(1):102-111.Li S,Xie L L.Progress and trend on near-field prob-lems in civil engineering[J].Acta Seismologica Sini-ca,2007,29(1):102-111.
[6]Wang G Q,Zhou X Y,Zhang P Z,et al.Characteris-tics of amplitude and during for near fault strong ground motion from the1999Chi-Chi,Taiwan Earth-quake[J].Soil Dynamics and Earthquake Engineer-ing,2002,(22):73-96.
[7]Hall J F,Heaton T H,Halling M W,et al.Near-source ground motions and its effects on flexible buildings[J].Earthquake Spectra,1995,11(4):569-605.
[8]Mavroeidis G P,Dong G,Papageorgiou A S.Near-fault ground motions,and the response of elastic and inelastic Single-Degree-of-Freedom(SDOF)Systems[J].Earthquake Engineering Structural Dynamics,2004,(33):1023-1049.
[9]Bray J D,Rodriguez-Marek A.Characterization of forward-directivity ground motions in the near-fault region[J].Soil Dynamics and Earthquake Engineer-ing,2004,(24):815-828.
[10]Dai J W,Tong M,Lee G C,et al.Dynamic respons-es under the excitation of pulse sequences[J].Earth-quake Engineering and Engineering Vibration,2004,3(2):157-169.
[11]Xu L J,Rodriguez-Marek A,Xie L L.Design spectra including effect of rupture directivity in near-fault re-gion[J].Earthquake Engineering and Engineering Vi-bration,2006,5(2):159-170.
[12]Alavi B,Krawinkler H.Consideration of near-fault ground motion effects in seismic design[C]∥Preceed-ings of the12WCEE,New Zealand:[s.n.]2000.2665.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心