# Frequently Asked Questions (FAQ)

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• ### I have a model with crossing line releases/line hinges and get implausible results.

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In general, crossing releases with different definitions (Figure 1) represent a contradiction, so the higher -order release is valid at this point.

• ### I deleted my shortcut from the viewer. How can I restore them?

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To access the viewer again, it is sufficient to create a new shortcut on the desktop and enter the following parameters:

For RFEM 5.26:

"C:\Program Files\Dlubal\RFEM 5.26\RFEM64.exe"/Viewer

For RSTAB 8.26:

"C:\Program Files\Dlubal\RSTAB 8.26\RSTAB64.exe"/Viewer

The existing program link can also be copied and supplemented with the addition/viewer.

• ### Can I create a visibility from objects even though the function is grayed?

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Yes, this is very easy to do with a small detour. You can do this with the help of Excel for any objects that you can specifically select with the Select function.

Export the desired spreadsheet to Excel. In our example, we want to select all members that contain entries for form -finding.

In Excel, you can then use the formula TEXTJOIN to display all member numbers with the comma as a separator in a row as a continuous list.

You can copy this enumeration and then use the Select function to specifically transfer the desired objects to your selection and thus create a visibility.

• ### How do I apply wind load on members of open structures?

1. Define a plane that will be used to apply the wind load.  You can do so by creating 4 corner nodes around your structure (Image 1).

2. Go to Tools -> Generate Loads -> From Area Loads on Members via Planes

Define the direction, magnitude, and Select Empty, On Members Only (Image 2).  Select the corner nodes that were previously created.

3. Select Settings for load generation to adjust the tolerance type.  Select Absolute via distance and input a value that will capture the entire width/length of the structure (Image 3). Click Ok twice to exit.

4. Right click on the area load and select Display Separately (Image 4).  The area load is now displayed as member loads (Image 5).  Note: The applied load is based on the member orientation.

• ### Is it also possible to use RF‑/TOWER Loading without the other TOWER add-on modules?

Yes, this is generally possible.

If a tower structure exported from RF‑/TOWER is recognized, all model-relevant members of this add-on module are listed in the Allocated Members section. Here you can also find the member numbers of the objects defined in RF‑/TOWER Equipment.

If the model was created without RF‑/TOWER Structure, the member numbers can be entered manually in the table rows. You can also use the button to define the components graphically in the work window of RFEM or RSTAB.

• ### Is it possible to switch off the minimum internal forces when displaying a result diagram so that the maximum values are only displayed?

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If you only want to display the minimum or maximum internal forces in the result diagram, you can find the option to switch to them in the result diagram navigator at the bottom.

• ### What is the meaning of the difference in the check sum of drag forces?

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After a successful calculation, the check sums of drag forces are displayed on the original model and on the simplified model in RWIND Simulation in the legend of the graphic window. They are the resultants of the wind loading in the global directions X, Y, and Z.
You can use it to compare the drag forces acting on the original model and the simplified model.
The simplified mesh is a special mesh that envelops the original model, and thus defines the model boundary.

If there are significant differences between the check sums, you should increase the level of detail in the Edit Model dialog box for a more refined, simplified model.

However, if there are any differences, please note that any closed openings may also have an influence on the check sums.

• ### Although I have modeled two identical structural systems, I obtain a different shape. Why?

This is most likely due to the quadrangle surfaces you created. In the case of curved surfaces, it is not possible to automatically integrate the objects that rest in the surface.

However, you can integrate them into the surfaces manually. Tips for this can be found in the linked technical article.

• ### How can I rotate a nodal support using the COM interface?

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The rotation of a nodal support is defined by means of a user-defined coordinate system. In the following example, a nodal support is rotated by 45 ° about the z-axis. It is not necessary to define a new coordinate system via nodes. In this case, it is sufficient to use the RotatedSystemType option, which allows for a spatial rotation of the support via three rotations about the x-, y-, and z-axis. The rotation is entered in radians:

Sub test_nodal_support()Dim iApp As RFEM5.ApplicationSet iApp = GetObject(, "RFEM5.Application")iApp.LockLicenseDim iMod As RFEM5.IModel3Set iMod = iApp.GetActiveModelOn Error GoTo e'   get interface of modeldataDim iModData As RFEM5.IModelData2Set iModData = iMod.GetModelData'   get interface of nodal supportDim iNs As RFEM5.INodalSupportSet iNs = iModData.GetNodalSupport(1, AtNo)'   get nodal support dataDim ns As RFEM5.NodalSupportns = iNs.GetData'   modify datans.ReferenceSystem = UserDefinedSystemTypens.UserDefinedReferenceSystem.Axis1 = AxisXns.UserDefinedReferenceSystem.Axis2 = AxisYns.UserDefinedReferenceSystem.Type = RotatedSystemTypens.UserDefinedReferenceSystem.RotationAngles.X = 0ns.UserDefinedReferenceSystem.RotationAngles.Y = 0ns.UserDefinedReferenceSystem.RotationAngles.Z = 45 * 3.14159265359 / 180'   set nodal support dataiModData.PrepareModificationiNs.SetData nsiModData.FinishModificatione:If Err.Number <> 0 Then MsgBox Err.description, vbCritical, Err.SourceiMod.GetApplication.UnlockLicenseSet iMod = NothingEnd Sub

The program takes the existing nodal support from the currently opened model and modifies it. Since the user-defined coordinate system is not a direct part of the INodalSupport interface of the nodal support, the rotation can also be transferred when creating a nodal support, of course.

• ### In CRANEWAY, there is a crane library with templates. Why is it grayed out?

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It is possible to import cranes from the crane library or a user-defined crane database.

However, the database does not contain any templates for design according to EN 1993‑6, so you can only create your own templates for your crane database.

If you select DIN 4132, you will find templates for the manufacturers DEMAG and KÜHNEZUG.

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First steps

We provide information and tips to help you get started with the basic program RFEM and RSTAB.

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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