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可液化场地地震反应完全耦合动力分析及其验证

DOI: 10.13197/j.eeev.2014.06.136.xuly.018, PP. 136-144

Keywords: 砂土液化,Biot动力固结方程,有限元,广义塑性模型

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Abstract:

目前完全耦合的动力分析方法在液化场地地震响应分析上应用较少,本文利用完全耦合的动力分析方法,模拟了0.15g和0.5g加速度输入下的自由液化场地振动台试验以及实际液化场地的地震动变化情况.利用修正的Pastor-ZienkiewiczMark-III模型来模拟砂土在地震荷载作用下的液化特性,并详细叙述了该模型参数的选取过程.分析结果表明该方法能够较好模拟液化场地地表加速度和孔压比时程的变化规律,模拟出的地表加速度反应谱在整个频域内与实测的地表加速度反应谱呈现相同的变化规律.同时,也说明了本文选用模型参数方法的合理性.

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