基于反应谱的近断层地震动潜在破坏作用分析
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摘要
为了提供修订抗震规范的依据,基于弹性和非弹性加速度、速度、位移反应谱以及相应的动力系数谱、非弹性与弹性加速度比值谱,分析了近断层与远场地震动潜在破坏作用的差别,并与我国规范的设计谱比较.结果表明:近断层双脉冲型地震动的反应谱谱值最高,与其它类型地震动相比,约高7倍,潜在破坏作用最大;引起A+B类场地反应谱谱值较高的原因主要是地震动的高峰值,引起C+D类场地反应谱谱值较高的原因是地震动的高峰值及中长周期动力系数谱谱值的增大;当考虑近断层脉冲型地震动影响时,我国抗震规范规定的特征周期值偏于不安全.
To provide a basis for seismic code revision,differences of the potential damage caused by near-fault and far-field ground motions were analyzed in terms of elastic and inelastic acceleration,velocity,and displacement response spectra,dynamic factor spectra,and inelastic to elastic acceleration ratio response spectra.And,a comparison was made between the calculated response spectra and the design spectra in Chinese Seismic Code.The results show that near-fault ground motion with two pulses has the highest response spectral value,which is almost seven times higher than those of ground motions of other types,and hence can cause the highest potential damage.The high response spectral value is mainly attributed to the peak value of near-fault ground motion in site A+B;and is not only attributed to the peak value,but also to the increase of dynamic factor during the medium-long period in site C+D.The characteristic period of Chinese Seismic Code tends to be unsafe when considering the effect of near-fault ground motion with two pulses.
To provide a basis for seismic code revision,differences of the potential damage caused by near-fault and far-field ground motions were analyzed in terms of elastic and inelastic acceleration,velocity,and displacement response spectra,dynamic factor spectra,and inelastic to elastic acceleration ratio response spectra.And,a comparison was made between the calculated response spectra and the design spectra in Chinese Seismic Code.The results show that near-fault ground motion with two pulses has the highest response spectral value,which is almost seven times higher than those of ground motions of other types,and hence can cause the highest potential damage.The high response spectral value is mainly attributed to the peak value of near-fault ground motion in site A+B;and is not only attributed to the peak value,but also to the increase of dynamic factor during the medium-long period in site C+D.The characteristic period of Chinese Seismic Code tends to be unsafe when considering the effect of near-fault ground motion with two pulses.
引文
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