外文翻译沟门常态混凝土重力坝及溢流坝段设计.docVIP

by Ansys finite element 毕业设计（论文） 外文翻译 题 目 南沟门常态混凝土重力坝及溢流坝段设计 专 业 水利水电工程 班 级 工115 班 学 生 指导教师 2015 年 Numerical computation of structures with quasi-brittle materiel under dynamic loading: case study of concrete gravity dam Abstract The present paper deals with a numerical computation using finite element method for concrete structures subjected to dynamic loads, usually of seismic nature the consequences of which are often devastating. In the general equation of dynamic, a law of concrete material behavior taking into account models based on the damage mechanics has been implemented. From a phenomenological viewpoint, the chosen behavior model takes into account the damage caused by the opening of micro-cracks. For numerical application, two dimensional seismic analysis of Koyna gravity dam is performed by using the 1967 Koyna earthquake records. The effects of damage on earthquake response of the concrete gravity dam are studied. 1. Introduction The simulation of nonlinear problems of damage and fracture processes for quasi-brittle materials, particularly concrete, is the subject of research studies in the field of civil engineering in the goal to serve for vulnerability studies (Lemaitre and Mazars, 1982; Lemaitre and Chaboche, 1985). The phenomena taking part in these processes are often complex and, even in simple cases, the analytical resolution of the problems turns out to be, for the least, difficult. To simulate complex structures subjected to static and/or dynamic loads, it is necessary to know the behavior of the material. Concrete is considered as the most used material in the design of structures which may occasionally be exposed to intense dynamic loading, whether of accidental or intentional nature. It belongs to a class of heterogeneous materials with quite complex