# Frequently Asked Questions (FAQ)

#### Customer Support 24/7

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.

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• ### What is the difference between the dongle drivers of CRANEWAY and RFEM or RSTAB?

#### Answer

Except for RWIND Simulation, all Dlubal Software products use the same dongle driver. Therefore, the one-time update or installation is sufficient, for example.

• ### When running PLATE‑BUCKLING as a stand‑alone program or as an add‑on module within RFEM/RSTAB, the "from RFEM" or "from RSTAB" button is grayed out.

#### Answer

If the PLATE‑BUCKLING add-on module is not opened as a stand-alone version, but via RFEM or RSTAB, it is possible to import the panels (c/t parts of a member cross-section) and the respective load cases of the RFEM or RSTAB model to PLATE‑BUCKLING (see the figure).

If there are no valid cross-sections of PLATE‑BUCKLING found in the model file of RFEM/RSTAB, the option for importing the buckling panels remains inactive.
• ### Is it possible to use the PLATE‑BUCKLING add-on module for the design of tapered members or trapezoidal panels?

#### Answer

The PLATE‑BUCKLING add-on module allows you to only calculate rectangular buckling panels.

The panel is entered in Window 1.1 of the add-on module. Another option is to create the panel from an existing RFEM or RSTAB file by selecting the respective c/t-part.
• ### After having downloaded the installation file, an error message appears saying that the setup file is defective. What can I do?

#### Answer

If this error occurs, the download did not run correctly. Please download the program again. Please note that the file can only be opened after the complete download.
• ### When installing a full or a test version on Windows Vista, a message indicating insufficient free space appears?What should I do?

#### Answer

The capacity of your C: drive does not allow the installation of the program. You should choose another partition of your hard drive for the installation. You can proceed as follows:
• Start by displaying the "Run" command from the Start menu by clicking Start → Run (or Windows + R).
• Type regedit and confirm.
• Open the key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
• On the right, double-click the ProgramFilesDir key and modify the data of this key by entering a new path of the installation folder.
• For example, enter the path D:\Program Files to change the partition on which the installation will take place.
• Finally, restart the installation by double-clicking the icon.

• ### During the installation, I get the message "Failed to install hardlock.cat signature."How can I fix this?

#### Answer

The license drivers are digitally signed. If you try to install a new license driver that is missing in the existing signature of your operating system, the corresponding message appears.
To fix this problem, please run Windows Update. After you restart the operating system, the installation should be completed.
• ### In PLATE‑BUCKLING, the reduction factor due to column buckling χc is calculated using the modified slenderness of the sheet metal ${\overline{\mathrm\lambda}}_{\mathrm p}$. Why is it not calculated using the slenderness of the equivalent compression member ${\overline{\mathrm\lambda}}_{\mathrm c}$ ?

#### Answer

RF-PLATE-BUCKLING performs the plate buckling analysis in compliance with Chapter 10 "Reduced Stress Method" of EN 1993‑1‑5. According to EN 1993‑1‑5, 10 (5) a), it is necessary to determine all reduction factors with the modified slenderness ratio of the sheet metal ${\overline{\mathrm\lambda}}_{\mathrm p}$ according to Equation (10.2).
• ### RSTAB and RFEM crash when the program starts up. I have installed the BitDefender antivirus software on my computer. What is the reason?

#### Answer

The problem was caused by an incorrect update of the signature database of BitDefender. Update the signature database of BitDefender to correct the problem.

• ### If new versions of RSTAB and RFEM are installed by means of msiexec, will the old versions be overwritten?

#### Answer

No, the old versions will not be uninstalled. Thus, it is possible to use several versions of RSTAB and RFEM on the computer at the same time, which is also useful in many cases.

If you want to uninstall an old RSTAB or RFEM version, you can do this with the following command:

msiexec -x <old MSI package>

For a complete list of all msiexec options, use the following command:

msiexec -h
• ### Is there a possibility to select "bars" and to apply the geometry as buckling field and its internal forces into the module?

#### Answer

Yes, that is possible. If the add-on module FE-BEUL is not opened as a stand-alone variant but via RSTAB / RFEM, the loading fields (c / t parts of a bar cross-section) as well as the respective load cases can be read in FE-BEUL of the RSTAB / RFEM model (see Image).

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#### Contact us

Did you find your question?
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. ”