#### Further Information

In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.

Receive information including news, useful tips, scheduled events, special offers, and vouchers on a regular basis.

• ### The network license includes both 2D and 3D licenses of RFEM/RSTAB.How can I ensure that I use the 2D version and not the 3D license?

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The problem is that the 3D version shortcut is only created on the desktop during the installation.
When starting the program, the authorization is checked. If a 3D version is available, the 3D version is also started. However, if there is no 3D version available, it is checked whether a 2D version is licensed. If this is the case, the restricted 2D version is started automatically.
In order to start the 2D version with an existing 3D license, it is necessary to adjust the link on the desktop.
Copy the link and rename it accordingly.
Then, right-click the shortcut and select "Properties" from the shortcut menu, and add "/2D" to the path to *64.exe.

• ### Can I define nonlinear support conditions via the COM interface?

You can use the COM interface to define nonlinear support conditions. The attached video and code shows an example of the support failure.
• ### Can I define nonlinear supports by using tables?

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Nonlinear support can be defined by using the "Edit" [...] button in Table 1.7.
• ### How can I open and close RFEM/RSTAB in the background via the 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 using the "CreateModel" method, or close the program using the "Close" command.

The following example shows how to start RSTAB, create a model with a node in the program, and close the program:

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 model    Dim iMod As RSTAB8.IModel2    Set iMod = iApp.CreateModel(filename)        '   add data to model    Dim nd As RSTAB8.Node    nd.no = 10    nd.X = 1    nd.Y = 2    nd.Z = 3        Dim iModdata As RSTAB8.iModelData    Set iModdata = iMod.GetModelData        iModdata.PrepareModification    iModdata.SetNode nd    iModdata.FinishModification        iMod.Save filenameE:  If Err.Number <> 0 Then MsgBox Err.description, , Err.Source        Set iModdata = Nothing    Set iMod = Nothing    iApp.UnlockLicense    iApp.Close    Set iApp = Nothing    End Sub

The "iApp.Show" command is optional. This allows for displaying the program normally, not in the background.

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

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

• ### I use automatic combinations, but some load cases are not used in the generated combinations. How can I change it?

If activating the automatic combinations in General Data, the actions, combination expressions, action combinations, and load or result combinations are created automatically. In this case, some default settings have been selected by the program developers, which apply in most cases.

By default, the following design situations with the respective combination expressions are generated:

• ULS: Ultimate limit state for permanent or temporary situation
• SLS: Serviceability limit state for characteristic situation
• SLS: Serviceability limit state for frequent situation
• SLS: Serviceability limit state for quasi-permanent situation

If load cases of the "Accidental" or "Earthquake" type have been defined, they are not considered in the preset combinations. For these load cases, it is necessary to create a new combination expression manually. You can select the appropriate design situation in the list.

Accidental load cases are only used in the "Ultimate Limit State - Accidental" or "Earthquake" expressions.

• ### Is it possible to adjust the initial values of the temperature courses entered for the fire resistance design? For example, I would like to adjust the initial value of the moisture content.

The fire resistance design is based on the temperature course from Annex A EN 1992‑1‑2.

The initial values for temperature courses cannot be adjusted in the add-on modules (RF‑/CONCRETE Members and RF‑/CONCRETE Columns). The temperature curves according to Annex A EN 1992‑1‑2 are based on the following assumptions:

• The specific heat of concrete corresponds to the specifications according to EN 1992‑1‑2, 3.2.2.
• The moisture is 1.5%. For moistures greater than 1.5%, the specified temperatures are on the safe side.
• The thermal conductivity of concrete is the lower limit value mentioned in EN 1992‑1‑2, 3.3.3.
• The emissivity value of the concrete surface is 0.7.
• The convective heat-transmission coefficient is 25 W/m²K.
• ### Is it possible to take a user-defined national annex as a basis for concrete design?

Yes, it is possible to adjust the parameters of a national annex. For this, it is first necessary to create a new user-defined national annex. The newly created annex is based on the original annex selected previously.

Once the annex has been created, you can change the parameters. It is also possible to adjust the description of the national annex.

The user-defined attachment is marked with "*".
• ### Regarding a nonlinear analysis of reinforced concrete, is there any feature in the program that increases the load until failure? Or is there any way how to describe the load increment until failure?

Such a feature for increasing the load up to the failure does not exist with regard to the design of reinforced concrete structures.

As an alternative, you can proceed as follows:

Then, select the individual load cases or combinations in the add-on module.

After performing the calculation to the point "Provided Reinforcement" for the first time, you can adjust and save the existing reinforcement proposed by the add-on module.

Finally, you can carry out the nonlinear analysis on the basis of the defined reinforcement.

The existing safety or the available utilization can be evaluated graphically after the successful calculation.

• ### Is it possible to insert an external image to the printout report?

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In RFEM and RSTAB, you can insert external images into the printout report.

For this, you need to copy the image to the Clipboard using [Ctrl+C]. Click "Insert" → "Image from Clipboard" in the printout report menu to insert the image into the printout report.

This image appears as a separate section at the end of the printout report and you can move it to any position using the drag-and-drop function.

This feature also allows you to print a clipping plane in the printout report. To do this, take a screenshot of the clipping plane and copy it to the clipboard.

• ### I cannot find an add-on module. What is the option there to quickly open a specific add-on module?

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All add-on modules are listed in Project Navigator - Data, sorted by materials or groups.

As an alternative, you can access the add-on modules sorted by topic using the "Add-on Modules" menu.

If you have found the add-on module in Project Navigator - Data, you can add it as a "Favorite" by right-clicking and using the corresponding shortcut menu. Thus, it can be found faster when used frequently.

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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.

#### Your support is by far the best

“Thank you for the valuable information.

I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. I have used a lot of software with a support contract in the field of structural analysis, but your support is by far the best. ”