最后，由梁单元结点力平衡建立分析弹性地基梁的矩阵方程。
At last, the matrix equation for analyzing elastic foundation beam is held up by the equilibrium of node forces.
首先在AN SY S软件中计算结构受结点力激励时外表面的法向位移；
The normal displacement on the coupling surface which is stimulated by node force is calculated in ANSYS firstly.
求解这一方程可分别得到非线性构形状态演化和结点力随机演化的概率结构。
By solving the joint equations, the probability characteristic of evolution of the nonlinear configuration state and the node force could be evaluated.
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