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Title:: Discussion on the Probability Distribution of Design Ground Motion Parameters

Author(s):: CHENG Shaoge; SUN Kui; (China Academy of Building Research,Institute of Earthquake Engineering,Beijing 100013,China)

Keywords:: seismic source; ground motion parameters; Extreme Value Type Ⅱ; continuous seismic service life; equal exceeding probability

摘要:: 基于地震危险性理论分析框架,分析各类震源对地震动参数分布的影响,建立地震动参数分布函数,并采用芦山地震动传播规律验证其工程通用性。基于等超越概率原则,提出不同后续使用年限设计地震动参数计算方法。结果表明:地震动参数分布函数服从极值Ⅱ型分布; 地震动参数累计分布函数可以用于不同后续使用年限设计地震动参数取值,满足现行规范要求。

Abstract:: Based on theoretical analysis framework of seismic risk,the probability distribution of ground motion parameters was analyzed incorporating the influence of all potential seismic sources.And Lushan motion was used to verify the generality of the analysis results.Based on the equal exceeding probability principle,an available approach was proposed to determine the design parameters of ground motion for different continuous seismic service life,and its probabilistic reliability was content with the current code.The results show that the probability distribution of ground motion parameters was embodied by Extreme Value Type Ⅱ.The method for determining design ground motion parameters has the characteristics of simple calculation and clear concept.