边界取值范围对混凝土坝数值计算结果的影响分析

Analysis on influence from boundary value domain on accuracy of numerical calculation on concrete dam

运用ANSYS软件,采用改变基础截取边界的平面域与深度域范围的方法,对混凝土重力坝案例进行了有限元应力应变计算;分析了坝内第一主应力与第一主应变值随基础计算边界改变时的变化情况;归纳了为获取稳定应力、应变计算值所需的有限元基础边界截取条件,提出了混凝土大坝结构应力应变有限元分析的合理计算边界参数。

Based on ANSYS,a finite element calculation of stress-strain is made on a case of concrete dam with the method of that changing the ranges of both the plane domain and the depth domain of the foundation clipping boundary,and then the status when the first principal stress and the first principal strain inside of the dam are changed as the functions of the calculated boundary of the foundation is analyzed. Furthermore,the boundary clipping conditions for the finite element foundation necessary for getting stable and reliable calculated values of stress-strain are summarized,while the reasonable calculated boundary parameters for the finite analysis made on the structural stress-strain of the concrete dam are proposed as well.