基于ANSYS的重力坝地震动力有限元分析

对某混凝土重力坝进行了二维和三维静力分析,三维有限元实体单元模型分析结果为应变小、拉力小、压力大,而二维有限元应变单元模型分析结果为应变大、拉力大、压力小.采用响应谱方法和三维实体模型分析了重力坝的动力特性和地震响应,最大地震动位移出现在坝顶上游侧,坝体的轴向中心附近处出现过大的应力集中,坝体轴向中心顶部的扭转变形以及静水压力作用对水平动位移和竖向动位移也有影响.

The Analysis of Seismic Dynamic on Gravity Dam with ANSYS

Taking one concrete dam for example,the comparative analysis of two dimensions′ FEM and three dimensions′ FEM of the dam is proposed with ANSYS and the result is that three dimension solid model has a smaller strain,less pull and bigger tension than that of two dimension strain model.With response spectrum method and three dimension solid model,the dynamic characteristics in gravity dam,together with the laws of seismic response displacements and stresses are analyzed.And the proposals show,considering the maximum seismic response displacement on the upstream side and the top of dam,the stress concentration in the domain of the axial centre of dam,the torsion deformation on the top of the axial centre of dam and hydrostatic pressure effect on the horizontal and vertical response displacements.