1999年台湾集集地震近断层竖向与水平反应谱比值的研究
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摘要
选取了1999年9月21日台湾集集7.6级地震主震中68组断层距在20km以内的近断层台站记录和46组断层距在40~70km的东部台站记录,按台站的上下盘位置、场地条件和断层距分组,对其竖向和水平加速度反应谱比值V/H进行了统计分析。研究表明:1)断层的滑动方向和断层破裂的传播方向对断层距在3km以内的台站上的地面运动谱比值V/H有一定影响,且主要体现在中短周期范围内,例如平行断层方向的谱比值要比垂直断层方向的谱比值大。在下盘断层距3~20km的范围内,场地条件对V/H基本没有影响。2)在集集地震中长周期(>3s)部分的谱比值通常>32,且有一个较高的峰值,表明其竖向运动加速度中的长周期分量大于其它地震。3)对于下盘的台站,地面运动在短周期(<0.2s)段的谱比值不随断层距的增加而减少。与中远(>40km)距离的台站相比较,近断层台站的V/H在工程界关心的周期范围内普遍较大。4)场地条件对谱比值V/H的影响在近断层处不显著。在远离断层的东部台站上,硬土场地谱比值V/H在长周期段大于软土场地。
The vertical to horizontal response spectra ratio (V/H) for 68 near-fault records (R_ rup<20km) and 48 eastern coast records (403s) is commonly larger than 2/3, the usually estimated value in references, with a noticeable peak, which means the long period component of vertical movement in this case is larger than that of other earthquakes; 3) for recordings at footwall side, the V/H in short periods (<0.2s) do not obviously decrease as rupture distance increases. Comparing to stations having larger rupture distances (>40km), V/H of near fault stations are commonly larger in the concerned periods in engineering circle; 4) the influence of site conditions on the spectral ratio seems insignificant in near fault area. For the east stations with larger distance, the V/H in long period range at hard soil site is longer than that at soft soil site.
The vertical to horizontal response spectra ratio (V/H) for 68 near-fault records (R_ rup<20km) and 48 eastern coast records (40
引文
王国权.2001.921集集地震近断层地面运动特征[D]:[学位论文].北京:中国地震局地质研究所.WANG Guo-quan.2001.The characteristics of near fault ground motion caused by the1999,Chi-Chi,Taiwan,earth-quake[D].Ph D thesis.Institute of Geology,China Earthquake Administration,Beijing(in Chinese).
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Dobry R,Borcherdt R D,Crouse C B.2000.Newsite coefficients and site classification system used in recent build-ing seismic code provisions[J].Earthquake Spectra,16:41—67.
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Niazi M,Bozorgnia Y.1992.Behaviour of Near-Source Vertical and Horizontal Response Spectra at Smart-1Array,Taiwan[J].Earthquake Engineering and Structural Dynamics,21:37—50.
Wang Guo-quan,Zhou Xi-yuan,Zhang Pei-zhen,et al.2002.Characteristics of amplitude and duration for near faultstrong ground motion from the1999Chi-Chi,Taiwan earthquake[J].Soil Dynamics and Earthquake Engineer-ing,22(1):73—96.
俞言祥,高孟潭.2001.台湾集集地震近场地震动的上盘效应[J].地震学报,23(6):615—621.YUYan-xiang,GAO Meng-tan.2001.Effect of the hangingwall and footwall on peak acceleration during the Chi-Chiearthquake,Taiwan[J].Acta Seismologica Sinica,23(6):615—621(in Chinese).
周正华,周雍年,卢滔,等.2003.竖向地震动特征研究[J].地震工程与工程振动,23(3):25—29.ZHOU Zheng-hua,ZHOU Yong-nian,LU Tao,et al.2003.Study on characteristics of vertical ground motion[J].Earthquake Engineering and Engineering Vibration,23(3):25—29(in Chinese).
Bozorgnia Y,Niazi M.1993.Distance Scaling of Vertical and Horizontal Response Spectra of the Loma Prieta Earth-quake[J].Earthquake Engineering and Structural Dynamics,22:695—707.
Borzorgnia Y,Mahin S A,Brady A G.1998.Vertical Response of Twelve Structures Recorded during the NorthridgeEarthquake[J].Earthquake Spectra,14(3):411—432.
Bozorgnia Y,Campbell K W.2004.The Vertical-to-Horizontal Response Spectral Ratio and Tentative Procedures forDeveloping Simplified V/HVertical Design Spectra[J].Journal of Earthquake Engineering,8(2):175—207.
Brian Chiou.2005.Estimating Vs30of CWB Free-Field Sites[J].(in press).
Building Seismic Safety Council(BSSC).1995.1994Edition NEHRP Recommended Provisions for Seismic Regula-tions for New Buildings,FEMA222A/223A,developed for the Federal Emergency Management Agency,Wash-ington,DC[R].
Building Seismic Safety Council(BSSC).1998.1997Edition NEHRP Recommended Provisions for Seismic Regula-tions for New Buildings,FEMA302/303,developed for the Federal Emergency Management Agency,Washing-ton,DC[R].
Building Seismic Safety Council(BSSC).2001.NEHRP recommended provisions for seismic regulations for newbuildings and other structures,2000Edition,Part1:Provisions,prepared by the Building Seismic Safety Councilfor the Federal Emergency Management Agency(Report FEMA368),Washington,DC[R].
Dobry R,Borcherdt R D,Crouse C B.2000.Newsite coefficients and site classification system used in recent build-ing seismic code provisions[J].Earthquake Spectra,16:41—67.
Lee W HK,Shin T C,Kuo K W,et al.2001.CWB Free-Field Strong-Motion Data from the921Chi-Chi Earth-quake:processed acceleration files on CD-ROM,strong motion data series CD-001[Z].Seismological Observa-tion Center,Central Weather Bureau,Taipei,Taiwan,March31,2001.
Niazi M,Bozorgnia Y.1992.Behaviour of Near-Source Vertical and Horizontal Response Spectra at Smart-1Array,Taiwan[J].Earthquake Engineering and Structural Dynamics,21:37—50.
Wang Guo-quan,Zhou Xi-yuan,Zhang Pei-zhen,et al.2002.Characteristics of amplitude and duration for near faultstrong ground motion from the1999Chi-Chi,Taiwan earthquake[J].Soil Dynamics and Earthquake Engineer-ing,22(1):73—96.
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