论混凝土拱坝有限元等效应力

On the finite element equivalent stress of concrete arch dams

有限元法计算功能很强,但由于应力集中,难以直接用于混凝土拱坝体形设计,本文首先说明采用笔者提出的有限元等效应力可以解决这一矛盾,然后给出它的计算方法和计算结果,最后说明有限元等效应力的控制标准。笔者提出的上述方法和控制准则已为我国《混凝土拱坝设计规范》(DL/T 5346—2006)所采用。

The finite element is a powerful method,but due to stress concentration,the tensile stress at the dam heel given by it is very large,so it is difficult to apply it directly in the design of arch dams.Integrating the stresses computed by FEM will give the internal forces of the dam from which the equivalent stresses will be obtained by the formula in material mechanics.The computing methods,examples of application and control criterion of the equivalent stress are described in this paper.