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工程力学  2013 

基于两种回归场的SPR误差评估在地震液化数值分析中的比较与应用

DOI: 10.6052/j.issn.1000-4750.2012.08.0593, PP. 145-153

Keywords: 地震液化流动,有限元数值模拟,SPR误差评估,线性与双线性回归场,计算精度

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Abstract:

在采用有限元方法数值模拟饱和砂土场地地震液化及流动的过程中,由于可液化砂土本构关系的非线性及土与结构接触的复杂性,在动力荷载增量很大时,网格易发生剧烈变形,导致计算结果缺乏需要的精度甚至中止计算。因此,需在计算中进行误差评估,获悉计算精度,为改善网格、优化最终计算结果提供依据。基于详细的SPR误差评估方法的原理和操作流程,比较了两种回归场在典型的液化流动数值案例中的结果和误差分布;结合液化程度、位移矢量分布等讨论了造成误差值大小差异的具体原因,既为数值分析提供可供参考的计算精度,也为进一步优化有限元计算提供合理依据。

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