FAQ 000739 ZH

建模 | 结构 RFEM RSTAB

I want to increase the roof slope by 5 degrees for an existing model after the fact. In the "Edit" menu, I found two functions that I could use: "Rotate" and "Shear."

What is the difference between these functions? Which function is more efficient for my purpose?

回答

The "Shear" function is the right choice for this purpose, because it allows you to shift the nodes of the members in accordance with the required rotation angle. By doing this, the length of the members changes.

To do this, select the nodes of the left roof pitch. Select the "Shear" command on the "Edit" menu. In the dialog box, specify the desired angle and the axis for the rotation. Next, select a point of the starting plane for the rotation. In this example, this is one of the end points of the posts. By using the "Shear" function, the nodes of the members are displaced, as are the loads on the members and nodes. Repeat the procedure for the other side of the roof, but don't select the ridge nodes this time and change the sign of the direction of rotation.

If you use the "Rotate" function for this issue, the length of the members would remain the same and the nodes of the top and bottom chord would not have the same x-y-coordinates. The nodes of the top chord would be slightly displaced in the x-direction.

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RFEM 主程序 RFEM
RFEM 5.xx

主程序

结构设计与有限元­分析软件(FEA)可以用于建立平面与空间结构模型,适用于由杆件、面、板、墙、折板、膜、壳、实体以及接触单元等的建模与分析计算。

RSTAB 主程序
RSTAB 8.xx

主程序

空间结构设计与分析软件,主要用于框架、梁与桁架等空间结构的建模与计算。可以输出内力、变形与制作反力的线性与非线性的计算结果。