摘要
利用通用的有限元程序ANSYS软件,以歧口17-2筒型基础平台为对象,采用三维八结点的块体等参元,在相同荷载和约束条件下,选取不同的土体边界,就筒型基础筒边土体的附加应力扩散行为进行了三维有限元分析。分析结果表明,筒边土体的附加应力扩散规律具有方向性;在确定土体边界尺寸时,应在水平方向取土体边界尺寸为5.0倍筒体直径,在竖直方向取土体边界尺寸为2.0倍筒高,此时就可以忽略土体的边界效应,进而在有限元计算精度和求解时间之间找到一个合理的平衡点。
As QiKou 17-2 platform with bucket foundation for example, under the same conditions on load and constraint, using 3D 8-node element and selecting different soil boundary, three-dimensional finite element analysis of subsidiary stress dispersion behavior of bucket edge soil is carried out. General purpose finite element program ANSYS is adopted in the analysis. It is shown that the rule of subsidiary stress dispersion of bucket edge soil has directivity; boundary effect of soil can be ignored when the boundary size of soil is determined, as long as taking quintuplicate diameter of bucket for the size of soil boundary at horizontal direction and taking twofold height of bucket for the size of soil boundary at vertical direction, and an rational balance point between computation accuracy and solution time of finite element can be found.
出处
《海洋技术》
2005年第2期109-113,共5页
Ocean Technology
基金
国家自然科学基金资助项目(50079016)
