Based on the 3_d deteriorated girder element, the formulae of FEM for elastic stability of variable cross_section compression bar concerning geometrical nonlinearity have been derived.
在三维退化梁单元的基础上，引入几何非线性，推导出计算任意变截面压杆稳定问题的有限元列式。
Based on the 3_d deteriorated girder element, the formulae of FEM for elastic stability of variable cross_section compression bar concerning geometrical nonlinearity have been derived.
在三维退化梁单元的基础上，引入几何非线性，推导出计算任意变截面压杆稳定问题的有限元列式。
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