3dec入门基本操作.doc

发布时间：2022-06-03 发布人：admin 分类：说明书资料大小：0.62M 资料格式：doc 举报版权申诉

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2.7 Sign Conventions The following sign conventions are used in 3DEC and must be kept in mind when entering input or evaluating results. BLOCK MOTION — Positive motion is in the positive coordinate axes directions. DIRECT STRESS— Positive stresses indicate tension; negative stresses indicate compression. SHEAR STRESS — With reference to Figure 2.17, a positive shear stress points in the positive direction of the coordinate axis of the second subscript if it acts on a surface with an outward normal in the positive direction. Conversely, if the outward normal of the surface is in the negative direction, then the positive shear stress points in the negative direction of the coordinate axis of the second subscript. The shear stresses shown in Figure 2.17 are all positive.

 常用的建模命令材料本构、参数边界条件、初始条件 jset dip 0 dd 0 or 0,.5,0 id = 1000 seek ; make all blocks visible ;id 号系统可以自动赋值，但最好是自己亲自赋值，以便后期辨别  边界条件和初始条件 ‘3DEC 提供了 2 类边界条件：应力边界和位移边界 2.6.3 Applying Boundary and Initial Conditions

应力边界位移边界示例：施加边界条件、初始条件应力边界：

水平应力施加梯度：垂直应力施加梯度：

各层材料不同，施加位移边界、初始应力（很好的借鉴）

CHANGE keyword Block and joint material characteristics are prescribed and changed with the CHANGE command. Material characteristics should be prescribed after all discontinuities are created. The range over which the CHANGE command is applied can be limited by the optional range phrase. Characteristics of blocks whose centroids lie within the optional range are changed. The range phrases for blocks are listed in Table 1.2. If no range is specified, all blocks in the model will have characteristics changed. The HIDE command can also be used to hide blocks selectively from changing characteristics (i.e., only visible blocks are changed).

 常用的 reg 操作命令

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