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水平向不均匀土对箱基动力阻抗的影响

, PP. 191-196

Keywords: 土-结构动力相互作用,箱形基础,阻抗函数,不均匀土,薄层元素法

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Abstract:

采用薄层元素法和有限单元法,建立了地基-箱形基础动力相互作用的三维分析模型,该模型可考虑箱形基础周围土的不均匀性影响。利用该模型,分析了水平方向不均匀土对箱形基础的水平和摇摆阻抗的影响。分析了水平方向不均匀土的厚度、剪切弹性模量以及材料阻尼比的影响。分析结果表明水平方向不均匀土使得箱形基础的各种阻抗均降低,特别是阻抗的虚部。水平方向不均匀土对摇摆阻抗的影响较大。水平方向不均匀土的剪切弹性模量的影响较大而其材料阻尼的影响较小。随着水平方向不均匀土的厚度的增加和基础埋深的增加,其影响增大。

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