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工程力学  2013 

液化场地中Timoshenko桩自由振动与屈曲的精确数值解

DOI: 10.6052/j.issn.1000-4750.2012.08.0590, PP. 138-144

Keywords: Timoshenko梁精确单元,轴力效应,拉格朗日方程,土体液化,Winkler模型

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Abstract:

基于单桩的Timoshenko梁模型和桩-土相互作用的Winkler模型,建立考虑轴力效应的具有分布参数的Timoshenko梁模型微分控制方程,确定对应的齐次方程的通解,并以此作为有限单元的基函数。推导得精确形函数矩阵,建立分布参数Timoshenko梁的精确有限单元,根据拉格朗日方程得到有限元离散方程和单元刚度矩阵、几何刚度矩阵和一致质量矩阵。应用建立的精确Timoshenko梁单元于分层液化土中单桩-土-结构系统的自由振动与屈曲模态分析,通过与对应解析解以及常规有限元解的对比,表明精确Timoshenko桩基础单元的可靠性与较常规有限元法的优势。

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