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• ### How can I open and close in the background via the RSTAB/RFEM COM interface?

By initializing a variable of the Application (Interface) type with "new", RFEM/RSTAB is started in the background. With this variable, you can also create a new model with the "CreateModel" method or close the program with the "Close" command

The following example shows how RSTAB is started, then the program creates a model with a node and the program is ended:

Sub RSTAB_open_close ()Dim filename As Stringfilename = Application.ActiveSheet.Cells (7, 3)'start rfemDim iApp As RSTAB8.ApplicationSet iApp = New RSTAB8.ApplicationiApp.LockLicenseiApp.ShowOn Error GoTo E'create modelDim iMod As RSTAB8.IModel2Set iMod = iApp.CreateModel (filename)    'add data to modelDim nd As RSTAB8.Nodend.no = 10nd.X = 1nd.Y = 2nd.Z = 3    Dim iModdata As RSTAB8.iModelDataSet iModdata = iMod.GetModelData    iModdata.PrepareModificationiModdata.SetNode ndiModdata.FinishModification    iMod.Save filenameE: If Err.Number <> 0 Then MsgBox Err.description,, Err.Source    Set iModdata = NothingSet iMod = Nothing    iApp.UnlockLicenseiApp.CloseSet iApp = Nothing    End Sub

The "iApp.Show" command is optional. This ensures that the program is not displayed in the background, but is displayed normally.

In the Downloads, you can find an Excel macro with subroutines for RFEM and RSTAB.

Please note that the folder where the file is created must exist.

• ### How can I display the stresses of a surface via RF‑COM?

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The stresses of a surface can be displayed via the COM interface. First, you need the interface for the model (IModel) and then the interface for the calculation (ICalculation2). Using this interface, you can get the interface for the results (IResults2):

Sub stresses_surfaces_example()Dim iApp As RFEM5.ApplicationDim iModel As RFEM5.modelSet iModel = GetObject(, "RFEM5.Model")On Error GoTo EIf Not iModel Is Nothing Then    '   get interface from model    Set iApp = iModel.GetApplication    iApp.LockLicense        '   get interface from calculation    Dim iCalc As RFEM5.ICalculation2    Set iCalc = iModel.GetCalculation        '   get interface from results from loadcase 1    Dim iRes As RFEM5.IResults2    Set iRes = iCalc.GetResultsInFeNodes(LoadCaseType, 1)        '   get equivalent stresses    Dim str_equ() As RFEM5.SurfaceEquivalentStresses    str_equ = iRes.GetSurfaceEquivalentStresses(1, AtNo, VonMisesHypothesis)    End IfE:If Err.Number <> 0 Then    MsgBox Err.Number & " " & Err.descriptionEnd IfIf Not iApp Is Nothing Then    iApp.UnlockLicenseEnd If

The GetSurfaceEquivalentStresses function requires the specification of the calculation hypothesis. In this case, the results of the von Mises stress are displayed. Please note that the COM interface uses SI units so the stress is transferred in N/m².

• ### Is it possible to use a cross-section from SHAPE‑THIN 9 in older versions of RFEM or RSTAB?

Yes, it is.
The cross-section created in SHAPE‑THIN 9 (file extension *.du9) should be opened and saved as SHAPE‑THIN 8 cross-section (file extension *.du8) in SHAPE‑THIN 8.

In order to open the cross-section in SHAPE‑THIN&nbso;8, set the file type to "All Files."

Now, you can normally save this cross-section as a SHAPE‑THIN 8 cross-section, and also open it in the previous program versions.

• ### When I try to export/import a model between RFEM and Rhino, I get an error regarding RF‑COM. "Export Error: Error to write data, message: The demo version of RF-COM allows models with a maximum of 12 members, 2 surfaces, and 2 solids only". How do I fix this?

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Then:

(1) Please close RFEM and Rhino.
(2) Open the ZIP folder and double click the *.rhi file.
(3) Select the "Anyone who uses this computer" option in the Rhino Package Installer.

• ### Is it also possible to create members when importing a DXF file into RFEM?

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The lines in a .dxf file can be imported as lines or members. You can select the "Create Members" option in the "ASCII Format DXF (*.dxf)" tab of the import dialog box (Figure 01).

When importing members, the names of layers are transferred as cross-section names, and the first predefined material is assigned. If a cross-section of the Dlubal cross-section library and a material from the Dlubal material library are recognized from the layer name, they are transferred. The layer name must be specified in the format [Cross-Section Name]$[Material Name] (for example, IPE 300$Structural Steel S 235 JR).

The import of lines/members is shown in the video.

• ### When trying to import a model from AutoCAD into RFEM, I am getting the error message "3DSOLID or REGION entity detected. Those entities are written in binary format, so import is not possible."What does this mean?

The reason this warning appears is because it is not possible to import 3D solids into RFEM from AutoCAD. Only 1D and 2D members can be imported in from AutoCAD to RFEM. The reason for this is because only line elements can be imported so with 3D solids they could not be automatically generated.

• ### As of which RFEM or RSTAB version is it possible to export the models into RWIND Simulation?

The "Simulate and Generate Wind Loads" feature for exporting models to RWIND Simulation is available in RFEM or RSTAB as of the version x.21.01 from 22.10.2019.

If you do not have a service contract, you can download the program version that you have purchased on the following page:

• ### Which features are available for the data exchange between Grasshopper and RFEM?

After the successful installation of the interface, the RFEM5 toolbar is available. The corresponding components allow you to control the export to RFEM. To do this, simply drag and drop them into the programming interface. The import from RFEM is not possible.

The "RFEM 5 COM Component" allows for communication between Grasshopper and RFEM. As soon as you use this component with the geometrical information, the export will begin. An opened RFEM file is expected. It is recommended to use an empty file because the export overwrites all information. The update mechanism is not implemented at the moment. By using "Value List," you can additionally define the unit which is used to describe the geometry. The modifications of tolerances are usually only necessary if the points have been defined very close to each other. You can enter the number to be stored for this in "Panel."
The "RFEM 5 Member Component" allows you to attach additional information to the geometry (lines, curves). These are considered during the export to RFEM so that the members can be created. The material and cross-section name can be entered in a text box (panel). The member rotation can be defined in [rad] by using "Number Slider." For the definition of member hinges, it is necessary to additionally load the "RFEM 5 Member Hinge Component." The input consists of 6 degrees of freedom which can be controlled individually. For the release of a degree of freedom, it is necessary to define the value "0," and spring constants are expected in the units [N/m] or [Nm/rad]. It is not possible to change the unit. Currently, nonlinearities cannot be specified.
The "RFEM 5 Surface Component" can be used in a similar way as the "Member" component. A surface is expected when entering the geometry. The material can be attached to them by using the "panel." The surface thickness can be defined in [m] by using the number slider. The stiffness type of the surface can be controlled by "Value List" with the predefined types.
You can create nodal supports by using the "RFEM 5 Nodal Support Component." On the Input page, you can define the points to be supported. In this case, it is recommended to use the already existing definition nodes of surfaces or lines. All 6 degrees of freedom can be controlled. In this case, the value "0" means a release in the respective direction, "-1" means a fixed support. Spring constants can be defined in the same way as member hinges.

You can download the Grasshopper file shown in the figure. It is only necessary to activate the "RFEM 5 COM Component."

• ### Which features are available for the data exchange between Rhino and RFEM?

In principle, it is very simple to use the interface. After the successful installation, the Dlubal toolbar is available in Rhino. This includes two icons (Export and Import).

"Import" allows you to import data from RFEM to Rhino. In this case, the whole RFEM model is always imported. No update is necessary. The data is added to the existing structure.
"Export" allows you to export data from Rhino to RFEM. The entire structure is usually exported. If you only want to export parts of the structure, select them before starting the export. In order to perform the export, it is necessary to open RFEM and create a file. Please note that the export procedure overwrites all existing data of the opened file. Therefore, it is recommended to open an empty file.

• ### Is it possible to create a video file in RWIND Simulation?

Yes, it is possible to create a video file in RWIND Simulation. Arrange the graphic on the screen and select the menu "Tools → Create Video File."

In the "Create Video File" dialog box (Figure 01), you can define the name of the video file in a separate dialog box by clicking the [Search] button. It is possible to select various video file types. Furthermore, you can also adjust the quality and the recording frequency.

Click the [Start] button to start the recording and the [Stop] button to stop it.

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If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

#### First Steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

#### Wind Simulation & Wind Load Generation

With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated 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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