> For the complete documentation index, see [llms.txt](https://manual-1-3.karamba3d.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manual-1-3.karamba3d.com/chinese_1_3_3/2-getting-started/2-getting-started-1/setting-up-a-structural-analysis/2.2.3-add-supports.md).

# 2.2.3: 添加支撑件

支撑件定义结构与地面的连接方式。支撑件控制节点处的平移或旋转。被激活后，按钮显示为黑色，表示在全局坐标系中 x、y 或 z 轴方向上的零平移（T）或是围绕相应的全局坐标系轴进行的零旋转（R）（在平面中使用局部轴时亦是同理）。节点索引或其定位可用于确定支持件的位置。以平面作为输入可界定面向局部的支撑条件。

{% hint style="info" %}
绿色箭头表示平移支撑件，紫色圆圈代表旋转支撑件（如图2.2.3.1）。 
{% endhint %}

![ 图2.2.3.1：支撑件界定结构与地面相互作用的方式](/files/-M9XuSrMhw0oIrmFFCYV)

就静态分析而言，结构需要支撑件，以避免其随意移动。在三维空间中，固态物体有六种运动模式或自由度（DOFs）：三种平移和三种旋转（如图2.2.3.2）。因此，在一个结构模型中至少需要六个支撑件才能对其进行固定。当模型或其部件可移动时，**“Analyze（分析）”**运算器要么拒绝计算，要么会反馈大幅度的位移。如遇类似问题，请将模型插入**“Eigenmodes（本征模型）”**运算器。该运算器可检测出导致上述问题的固态物体运动。

![ 图2.2.3.2：空间中的物体具有六个自由度（DOFs）](/files/-M9XuRjeWapDXqdxTrj1)

## \*\*\*\*


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