external virtual work
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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。
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.
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