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浅硬场地剪切波速不确定性对场地地震反应的影响

DOI: 10.13197/j.eeev.2014.04.123.chenlw.016, PP. 123-129

Keywords: 浅硬场地,剪切波速不确定性,MonteCarlo模拟,场地传递函数,场地放大函数

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Abstract:

场地剪切波速不确定性是场地地震反应分析误差的重要来源,对场地地震反应不确定性的影响显著。根据现有Turkeyflat一类浅硬场地实测剪切波速数据,建立场地土层剪切波速概率模型,采用MonteCarlo随机模拟手段对场地概率模型随机生成50组场地土层参数,建立场地土层剪切波速不确定性与场地传递函数(STF)及地震动输入下场地放大函数(SAF)不确定性的关联规律。分析计算结果发现当频率小于场地第一特征频率时,剪切波速不确定性对场地STF以及SAF不确定性影响较小,且场地STF及SAF不确定性取决于底层土层剪切波速不确定性;当频率大于第一特征频率小于第二特征频率时,场地STF及SAF不确定性主要来源于表层土层剪切波速不确定性,且STF及SAF的标准差值随频率增长而显著增长,远大于其它土层剪切波速不确定性影响;当频率大于第二特征频率时,不同土层剪切波速不确定性对STF不确定性的影响相当,且随着频率增长基本稳定,但对于SAF而言,表层土剪切波速不确定性的影响最大;场地土体地震作用下非线性降低了场地地震反应的不确定性,但与剪切波速不确定性的关联性规律不变。

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