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薄壁箱梁剪力滞效应分析的组合单元法

Keywords: 桥梁工程,剪力滞效应,组合单元,薄壁箱梁,有限元

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Abstract:

针对薄壁箱梁剪力滞效应有限元计算单元自由度多,计算工作量大的的问题,提出一种考虑剪力滞效应的组合单元法。顶板采用平面板单元模拟,轴向位移插值函数取3次多项式;腹板及底板采用梁单元分析。为减少有限元分析的单元自由度数目,取顶板单元的节点位移参数为基本位移参数,腹板与底板的位移模式由顶板与腹板及腹板与底板的变形协调关系得到,最后通过变分原理得到组合单元的刚度矩阵。以一座实桥为工程背景,通过与有限元程序计算结果对比,得出此方法的计算精度较高,计算效率亦比较高。

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