统一抗震设计谱的双规准反应谱和标定周期(英文)
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摘要
为了考察地震动加速度反应谱的统一性,用2种标定周期(反应谱卓越周期Tp和平滑化反应谱卓越周期To)分别对传统规准反应谱的横坐标进行规准化.考虑场地条件和断层距的影响,对集集地震近600水平向分量地震动5%阻尼比的规准反应谱和2种双规准反应谱进行了分析.结果表明场地条件和断层距对规准谱的影响明显,但对2种双规准谱的影响甚小.离散性分析表明对规准反应谱横坐标的规准化得到的双规准谱具有离散性小的特点.最后,对标定周期(Tp,To)的分布进行了参数分析并与以往结果进行了比较.地震动反应谱和标定周期的新特性可以为规范设计谱的应用和发展提供参考依据.
Aiming at the uniform features of acceleration response spectra,two scalar periods—the response spectral predominant period Tp and the smoothed spectral predominant period To are employed to normalize the abscissa of the normalized response spectra (NRS) of ground motions,respectively.Engineering characteristics of 5%-damped NRS,and the bi-normalized response spectra (BNRS) are investigated accounting for the effects of soil condition and fault distance.Nearly 600 horizontal ground motion components during the Chi-Chi earthquake are included in the analysis.It shows that the NRS strongly depends on soil condition and fault distance.However,soil condition and distance have only a slight influence on two kinds of BNRS.Dispersion analysis indicates that such normalization can reduce scatter in the derivation of response spectral shapes.Finally,a parametric analysis of the scalar periods (Tp,To) is performed and then compared with those of previous studies.These special and particular aspects of earthquake response spectra and scalar periods need to be considered in developing earthquake-resistant design criteria.
Aiming at the uniform features of acceleration response spectra,two scalar periods—the response spectral predominant period Tp and the smoothed spectral predominant period To are employed to normalize the abscissa of the normalized response spectra (NRS) of ground motions,respectively.Engineering characteristics of 5%-damped NRS,and the bi-normalized response spectra (BNRS) are investigated accounting for the effects of soil condition and fault distance.Nearly 600 horizontal ground motion components during the Chi-Chi earthquake are included in the analysis.It shows that the NRS strongly depends on soil condition and fault distance.However,soil condition and distance have only a slight influence on two kinds of BNRS.Dispersion analysis indicates that such normalization can reduce scatter in the derivation of response spectral shapes.Finally,a parametric analysis of the scalar periods (Tp,To) is performed and then compared with those of previous studies.These special and particular aspects of earthquake response spectra and scalar periods need to be considered in developing earthquake-resistant design criteria.
引文
[1] Chopra A K.Dynamics of structures:theory and application to earthquake engineering[M].2nd ed.Upper Saddle Riv- er,NJ:Prentice-Hall,2001.
[2] Seed H B,Ugas C,Lysmer J.Site-dependent spectra for earthquake-resistance design [J].Bull Seismol Soc Am, 1976,66(1):221-243.
[3] Mohsen T,Farzaneh H.Influence of earthquake source pa-rameters and damping on elastic response spectra for Iranian earthquakes[J].Engineering Structures,2002,24:933-943.
[4] Rathje E M,Faraj F,Russell S,et al.Empirical relationship for frequency content parameters of earthquake ground mo tions[J].Earthquake Spectra,2004,20(1):119-144.
[5] Xu Longjun,Xie Lili.Bi-normalized response spectral char acteristics of the1999Chi-Chi earthquake[J].Earthquake Engineering and Engineering Vibration,2004,3(2):147 155.
[6] Chopra A K, Chintanapakdee C. Comparing response o SDF systems to near-fault and far-fault earthquake motion in the context of spectral regions[J].Earthquake Engng Struc Dyn,2001,30:1769-1789.
[7] Mavroeidis G P,Dong G,Papageorigiou A S.Near-faul ground motions, and the response of elastic and inelastic single-degree-of-freedom (SDOF) systems[J].Earthquake Engng Struc Dyn,2004,33:1023-1049.
[8] Xu Longjun,Xie Lili.Site-dependent bi-normalized earth quake acceleration response spectra[J].Journal of Harbin Institute of Technology,2004,36(8):1061-1064.(in Chi nese)
[9] Lee W H K,Shin T C,Kuo K W,et al.CWB free-field strong-motion data from the921Chi-Chi earthquake:pro cessed acceleration files on CD-ROM,strong-motion data series CD-001[C/OL].Seismological Observation Center, Central Weather Bureau,2001.
[2] Seed H B,Ugas C,Lysmer J.Site-dependent spectra for earthquake-resistance design [J].Bull Seismol Soc Am, 1976,66(1):221-243.
[3] Mohsen T,Farzaneh H.Influence of earthquake source pa-rameters and damping on elastic response spectra for Iranian earthquakes[J].Engineering Structures,2002,24:933-943.
[4] Rathje E M,Faraj F,Russell S,et al.Empirical relationship for frequency content parameters of earthquake ground mo tions[J].Earthquake Spectra,2004,20(1):119-144.
[5] Xu Longjun,Xie Lili.Bi-normalized response spectral char acteristics of the1999Chi-Chi earthquake[J].Earthquake Engineering and Engineering Vibration,2004,3(2):147 155.
[6] Chopra A K, Chintanapakdee C. Comparing response o SDF systems to near-fault and far-fault earthquake motion in the context of spectral regions[J].Earthquake Engng Struc Dyn,2001,30:1769-1789.
[7] Mavroeidis G P,Dong G,Papageorigiou A S.Near-faul ground motions, and the response of elastic and inelastic single-degree-of-freedom (SDOF) systems[J].Earthquake Engng Struc Dyn,2004,33:1023-1049.
[8] Xu Longjun,Xie Lili.Site-dependent bi-normalized earth quake acceleration response spectra[J].Journal of Harbin Institute of Technology,2004,36(8):1061-1064.(in Chi nese)
[9] Lee W H K,Shin T C,Kuo K W,et al.CWB free-field strong-motion data from the921Chi-Chi earthquake:pro cessed acceleration files on CD-ROM,strong-motion data series CD-001[C/OL].Seismological Observation Center, Central Weather Bureau,2001.
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