基于拱梁分载法变形假定的拱坝有限元分析研究

Study on finite element analysis of arch dam with deformation assumption of arch-cantilever load method

基于分载法的径向纤维直线假定,并结合有限元方法的优点,本文提出一种带有分载法基本假定的有限元计算方法。以白鹤滩水电站典型拱圈为例,利用大型通用软件ANSYS,提出了两种基于径向纤维直线假定的有限元分析途径,并对约束范围做了探讨,解决了有限元计算的应力集中难题。通过与结构力学简化方法和有限元等效应力法的比较,验证了该方法的可行性。同时对该方法在拱坝三维有限元应力分析中的应用作了初探,具有一定的参考价值。

Based on the linear assumption of radial fiber for the trial load method and combined with the advantages of the finite element method, a finite element method with some basic assumptions of the arch-cantilever load method is put forward herein. Taking the typical arch of the dam for Baihetan Hydropower Station as a study case, two linear assumption of radial fiber based approaches for the finite element analysis are proposed with ANSYS, and moreover, the relevant range of constraints is studied; with which the problems of stress concentration in the finite element calculation are solved. Through the comparison with both the simplified method of structural mechanics and the finite element equivalent stress method, the feasibility of the method is verified. At the same time, application of the method to the 3D stress finite element analysis of arch dam is preliminarily researched as well.