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2008年汶川MS8.0地震获得了大量的强震动记录,为研究反应谱特征参数衰减特性提供了重要的基础资料.本文对已知场地条件的174个台站的记录进行研究,计算其加速度反应谱并按照最小二乘分段拟合方法进行标定,进而拟合了反应谱平台值的衰减关系;对比分析了水平方向与竖直方向反应谱平台值的衰减特性,提出用“平台值的场地衰减影响系数”来定量研究不同场地类型对反应谱平台值的影响,用“衰减曲线下降速率”来定量分析不同衰减曲线的衰减速率.通过计算得出水平向Ⅰ,Ⅱ,Ⅲ类场地的平台值场地衰减影响系数平均值分别为0.535 8,1和1.579,且Ⅲ类场地的加速度平台值衰减曲线的衰减速率最小.
A great deal of strong ground motion records have been obtained for the Wenchuan MS8.0 earthquake in 2008, providing important basic data for studying the attenuation characteristics of the characteristic parameters of the response spectrum.This paper studied the records of 174 stations with known site conditions and calculated their acceleration responses Spectrum and the least square fitting method was used to calibrate the fitting relationship between the response spectrum and the attenuation of the plateau response value. The attenuation characteristics of the plateau response spectra in the horizontal and vertical directions were compared and analyzed. The effect of different site types on the response plateau values was quantitatively studied, and the decay rate of different decay curves was quantitatively analyzed by using the decay rate of decay curve. By calculating the horizontal velocities of Ⅰ, Ⅱ, Ⅲ The average attenuation coefficient of the site value of the site in the class site is respectively 0.535 8,1 and 1.579, and the attenuation rate of the platform attenuation value of the site in the class Ⅲ site is the lowest.