The governing equations of the raft are obtained based on the thin plate theory and the virtual work principle.
筏板的控制方程由薄板理论和虚位移原理得到。
The determination of freedom less than the actual one may be find implicit constraint properly on the basic of the given one in using the virtual work principle to solve the problems.
由虚功原理解题时可在题中给定约束的基础上，适当考虑隐含约束，确定比实际少的自由度。
Then, the generalized stiffness matrix and load vector in the equilibrium equations are formulated by using the virtual work principle, and the numerical integration method is discussed.
然后，由虚功原理推导出了整体平衡方程中的广义刚度矩阵和荷载向量的具体表达式，并对其数值积分方法进行了讨论。
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