Based on the theory of the bending of non-prismatic beam, the paper has derived a rigidity matrix and the equivalent node load of the rigid-frame element with variable sections.
本文从非棱柱形梁的弯曲理论出发，推导出了变截面刚架元的单元刚度矩阵和等效结点载荷。
On the basis of mechanical analysis, the rigidity matrix of flat shell element has been determined and the displacement of joint has been found out according to the situation of loading.
在力学分析的基础上，确定了平面壳体单元的刚度矩阵，并根据载荷情况求出节点位移。
The calculated rigidity matrix is convergent everywhere, including these triangular toroidal element closed to the symmetrical axis.
如果用这种新的形状函数，则由此计算求得的刚度矩阵，不论三角圆环有限元的位置是否靠近轴线。
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