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混凝土坝接近破坏时混凝土材料进入塑性状态发生有限变形,研究几何非线性和包含应变软化的材料非线性对其极限承载能力的影响具有实际意义。该文的研究中本构律考虑材料非线性的应变软化,协调律考虑几何非线性,平衡律涉及几何非线性,采用超载法分析混凝土坝的极限承载能力,选取弧长法计算混凝土坝上游水压荷载位移曲线极值点以及下降段,给出双重非线性即包含应变软化的材料非线性和几何非线性对重力坝系统整体极限承载能力的影响。
When the concrete dam is close to failure, the concrete material enters a plastic state and undergoes a finite deformation. It is of practical significance to study the influence of geometric nonlinearity and material nonlinearity including strain softening on its ultimate bearing capacity. In this paper, the constitutive law considers the material nonlinear strain softening, the coordination law considers the geometrical nonlinearity, the equilibrium law involves the geometrical nonlinearity, the overloading method is used to analyze the ultimate bearing capacity of concrete dams, and the arc length method is used to calculate the upstream water Pressure load displacement curve extremum point and the descending section, the influence of the double nonlinearity, that is, the material nonlinearity and the geometric nonlinearity of strain softening, on the ultimate bearing capacity of the gravity dam system is given.