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。
For elements with tapered ends, the equivalent node load equations can be derived based on those of same cross-section elements and tapered elements according to sub-structure method.
对双锥型变截面单元，推导了等截面单元的等效结点荷载公式，介绍了利用子结构分析法得到双锥型单元等效结点荷载的过程。
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