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根据圣维南原理将拱坝裂缝的大体位置作为一个子模型,利用细小的有限元网格对子模型进行剖分,利用破坏追踪的方法在子模型中搜索裂缝的位置,根据应力状态确定裂缝的产状。在子模型破坏过程中边界条件相应地会发生变化。利用子结构法将子模型的单元刚度矩阵凝聚到原始模型与子模型的公共节点上,利用原始模型重新进行整体分析,获得子结构在破坏过程中的边界条件,重复进行下去,可获得拱坝裂缝的相对精确位置。
According to San-Venant principle, the general position of arch dam crack is taken as a sub-model, and the sub-model is subdivided by a small finite element mesh. The position of crack in the sub-model is searched by destructive tracking method and the crack is determined according to the stress state The appearance of. The boundary conditions change correspondingly during sub-model destruction. The substructure method is used to condense the element stiffness matrix of the submodel into the common node of the original model and the submodel. The original model is used to re-analyze the whole structure to obtain the boundary conditions of the sub-structure in the process of destruction, and the arch dam can be obtained by repeating the process. The exact location of the crack.