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。

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There are 2 rail dual beam bridge, for pad beam pad on each node truss should get off track, on the edge of the I-beam to pad.

双梁桥架上有2根轨道，用于桁梁应垫梁应垫在各节点处，下车轨道边上的工字钢也要垫好。

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The Recursion formulae of the node corner displacement are derived in the text and that internal of the beam can be solved.

推出了求解无结点侧移连续梁的结点转角位移的递推公式，进而求得梁板的内力。

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