【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.更多还原

【Abstract】 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.更多还原