The stiffness matrix, equivalent nodal load and consistent mass matrix are derived for the beam element with variable cross-section.

导出了变截面梁单元的单元刚度矩阵、单元等效节点荷载和单元一致质量矩阵。

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But force shape functions in flexibility methods establish the relations of nodal forces and section forces, and the results are exact.

而基于力的形函数的柔度法建立了单元两端与单元内部力的关系，能够得到精确的结果。

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