【摘要】 本文利用近20年国内外大地震时获得的数字强震仪记录分析强震动的长周期分量特性,给出了不同场地上的平均加速度反应谱及其拟合曲线。结果表明,现行抗震设计规范中设计谱的特征周期和长周期谱值明显偏小。在此基础上提出了长周期设计反应谱的修正建议。文中还根据统计分析提出了不同阻尼比的反应谱修正公式。更多还原

【Abstract】 The accelerograms of some large earthquakes recorded by digital accelerographs are used for analyzing the features of long period component of strong ground motion. The mean acceleration response spectra and their fitting spectra for different sites are derived. The characteristic periods and the spectral values for long period portion of the design spectra in the code for seismic design of buildings (GB50011-2001) of China are obviously lower than those from the statistical results. A suggestion on modifying the design spectra is made and an experimental relation of spectral values with different damping ratios is proposed.更多还原