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针对拱坝坝体与坝肩动力相互作用的非线性动摩擦接触问题,提出了坝肩稳定分析的动接触降强算法。该方法在传统有限元动力时程降强法的基础上,将坝肩可能滑动块体、地基、坝体和库水作为一个统一体系进行动力分析计算,能更准确地考虑坝肩滑块体与坝体的动力相互作用,并且根据接触问题局部非线性的特点,将作用在接触体上的力系分解为外力和接触界面上的接触力,以接触体的位移为基本未知量,而以接触区域局部坐标系下的结点接触力为迭代变量,将非线性接触迭代收缩在可能接触面上进行,把复杂的摩擦接触非线性反映在接触力的变化上,使得迭代计算变得简单易行。
Aiming at nonlinear dynamic friction contact problem between arch dam and abutment, a dynamic contact reduction algorithm for stability analysis of abutment is proposed. Based on the traditional finite element dynamic time-history method, this method calculates the dynamic analysis of the possible sliding block, foundation, dam body and reservoir water as a unified system, According to the local non-linearity of the contact problem, the force acting on the contact body is decomposed into the external force and the contact force on the contact interface, and the displacement of the contact body is basically unknown, The contact force in the local coordinate system of the contact area is an iterative variable, and the non-linear contact iteration is shrunk on the possible contact surface. The complex friction contact nonlinearity is reflected in the change of contact force, which makes the iterative calculation easy. Row.