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Frequently Asked Questions (FAQ)
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It is always necessary to pay attention to the member orientation and member rotation when defining the columns consisting of several single members. Some members have the x-axis directed upwards or rotated (see Figure 01). Due to different orientations, the sign changes for My or Mz.You can easily check these settings by activating the display of member axis systems (see the figure).
AnswerYes, it is possible.You can define the rotation about the Z-, Y-, or X-axis by selecting 2 or 3 nodes. Find the corresponding command button to the right of the text box for the rotation angle. See Figure 01.If you have entered a member that is rotated about its own axis (for example, a purlin on an inclined roof), you can import the "Member Rotation ß" to the rotation of the nodal support. See Figure 02.
AnswerThe trigger for this is due to the member rotation of a member. A member rotation can be defined in RFEM and RSTAB using two options:
- Option 1: Rotation via angle
- Option 2: Rotation via help node
AnswerDepending on the orientation of the lines/members in space, the coordinate systems along the line or member may be different. You can find a detailed definition of the orientation under the link below this FAQ. In order to unify the coordinate system, the line or member must have an identical member rotation. For curved objects, this is only ensured if they are rotated via a help node. For this, select "Inside" as the node number. The plane can be defined by using the options "x-y" and "x-z."
AnswerIf the coordinate systems of the members are not consistently the same for structures with many arcs (see the right model in the figure), the member rotation or line rotation can be performed very easily with a help node (result see left model in the figure).
Right-click the line or the member. In the shortcut menu, select the "Reverse Line Orientation" or "Reverse Member Orientation" option (see Figure 01).
Rotation of the line or member axis system is possible by using a rotation angle, which you can define in the "Edit Line" or "Edit Member" dialog box (see Figure 02). As an alternative, you can orientate the member to a help node.
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Wind Simulation & Wind Load Generation
With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
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