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通过对美国西部715条水平强震观测数据分析,按照场地条件、震级、震中距3个因素分组,以Ⅱ类场地峰值加速度PGA作为地震动强度,取有效峰值加速度EPA(阻尼比为5%时,0.1～0.5s范围内加速度反应谱平均值除以2.5)作为计算标准,统计得出场地放大系数。结果表明,在同一地震强度下,Ⅰ、Ⅱ、Ⅲ场地的场地放大系数依次增大;在同一场地条件下,场地放大系数随着地震动强度的增大呈减小的趋势。在统计结果基础之上,提出了适用于我国抗震规范的场地放大系数建议值及其应用方法,可供GB 50011—2010抗震规范修订时参考。
Based on the observation data of 715 strong earthquakes in the west of the United States, the effective peak acceleration (EPA) at the peak acceleration of class Ⅱ (PGA) and the peak acceleration of class Ⅱ (PGA) were used according to the site condition, magnitude and epicenter distance , 0.1 ~ 0.5s range of acceleration response spectrum divided by 2.5) as a calculation standard, statistics obtained site amplification factor. The results show that under the same seismic intensity, the site amplification factors of sites Ⅰ, Ⅱ and Ⅲ increase in turn. Under the same site conditions, the site amplification factor decreases with the increase of ground motion intensity. Based on the statistical results, proposed values and application methods of site amplification factors that are applicable to China’s seismic code are provided for reference when the GB50011-2010 seismic code is revised.