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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For conservative external nodal moments, the virtual work for the external moment can result in an external load stiffness matrix, which can significantly modify the geometrical stiffness matrix.

对于保守弯矩，节点外荷载弯矩的虚功产生外荷载刚度矩阵，这个矩阵会改变几何刚度矩阵一些项。

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For conservative external nodal moments, the virtual work for the external moment can result in an external load stiffness matrix, which can significantly modify the geometrical stiffness matrix.

对于保守弯矩，节点外荷载弯矩的虚功产生外荷载刚度矩阵，这个矩阵会改变几何刚度矩阵一些项。

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