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在有限元法中,可以对全部节点形成总体刚度矩阵,包括约束的节点和自由节点,然后施加约束条件。该法简单,程序上易处理,但占用存贮太大。也可以仅对自由节点(包括一个方向自由的节点)形成总刚,这样可以节省存贮空间,减少方程数。国外引进的几个土坝有限元程序有的采用了这种方法。了解该法对编制有限元程序和阅读引进的程序会有些帮助。
In the finite element method, a global stiffness matrix can be formed for all nodes, including the constrained nodes and the free nodes, and then impose constraints. This method is simple and procedurally easy to handle, but it takes up too much memory. It is also possible to form a total just for the free nodes (including nodes that are free in one direction), which can save storage space and reduce the number of equations. Some of the earth dam finite element programs introduced abroad have adopted this method. Understanding this law will help in the preparation of finite element programs and reading of introduced programs.