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Title:: Influence on Site Amplification Factors of Random Characteristic of Soil Parameters

Author(s):: LIU Shiyao; (Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin,150080, Heilongjiang,China)

Keywords:: sensitivity analysis; site amplification factor; random shear velocity model; quarter-wavelength method; transfer function

摘要:: 以Turkey Flat标准试验场为基准场地,以Toro剪切波速模型为基础,进行Monte Carlo模拟,生成剪切波速、层厚和密度随机样本各200条,将各土层随机参数组成4个工况作为不确定分析的基础。采用常用的四分之一波长法和传递函数法计算场地放大因子,分析放大因子以及特征周期对4种工况的敏感度。结果表明:土层剪切波速、层厚和密度的随机性对2种方法计算得到场地放大因子有相同的影响; 剪切波速的随机性对放大因子和特征频率的影响比其他参数大; 四分之一波长法得到的放大因子和特征频率对土层各参数的敏感性弱于传递函数方法。

Abstract:: According to the Toro share velocity model,we use the Monte Carlo method to generate 200 shear velocities,thickness and density random samples for uncertainty analysis,based on soil structure from the Turkey Flat site.Computing the quarter-wavelength(QWL)method amplification factor as well as transfer function(TF)and estimating their sensitivity under four conditions made up of random soil samples mentioned above.The results show that uncertainties of shear velocity,thickness and density have same impact on the spectrum characteristics using two methods.The influence of shear velocity on both amplification factors and fundamental frequency is predominant among different soil parameters.In addition,amplification factors and fundamental frequency of QWL are less sensitive to random soil parameters than that of TF's.