# Frequently Asked Questions (FAQ)

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• ### Is it also possible to manually enter the load for the punching shear design in RF‑PUNCH Pro?

#### Answer

Yes, it is possible in Window "1.5 Punching Nodes."

For example, this can be used if the determination of the punching load by using the smoothed or unsmoothed distribution of shear forces in the control perimeter is negatively affected by singularities.

• ### How can I control the wind load distribution on tower sides in the RF‑/TOWER Loading add-on module?

#### Answer

A user-defined wind load distribution is not provided in the Eurocode. In order to implement a user-defined wind load distribution in the RF‑/TOWER Loading add-on module, this can only be done after conversion to DIN, for example, DIN 4131:1993‑11, see Figure 01, Window "1.3 Wind Load - Part 1."

Then, you can select the user-defined distribution in Window 1.4 "Wind Load - Part 2," and define it in the adjacent table, see Figure 02.

• ### I have manually defined a snow load of 5 kN/m² in the RX‑TIMBER program. However, the calculation uses a load of 4 kN/m². Why is the defined snow load not applied?

#### Answer

According to EN 1991‑1‑3, the snow load must be multiplied by the factor of 0.8 for the snow load on a roof. Therefore, the following load results:

sk = 5 kN/m² × 0.8 = 4 kN/m²

If the load has already been calculated for the roof, you can enter the load completely under the user-defined loads. This is shown in Figure 01 and in the video.

• ### How can I design a reinforced concrete cross-section in SHAPE‑MASSIVE?

#### Answer

In SHAPE-MASSIVE, it is necessary to activate the reinforced concrete design in General Data. As soon as the design is active, you can make the corresponding settings for the design in a separate tab (Figure 01).

There are three types of the design:

Stress-Strain Distribution (Example 01):
It is possible to determine the existing design ratio by specifying the internal forces.

Design Safety (Example 02):
The program determines the state of failure (ratio = 100%) and, related to this, the available safety.

Design (Example 03):
By specifying the maximum and the minimum diameter, or the minimum and the maximum reinforcement, it is possible to increase the reinforcement within the design.

Irrespective of which one of these three methods is used, it is necessary to specify the reinforcement position and the acting internal force (Figure 02).
• ### I have already printed some graphics into my printout report. Now, I would like to adjust the colors of the panel. Is it possible to change or update the color scale for all figures in the printout report at once?

#### Answer

If a user-defined panel has already been created, this color scale is displayed in Display Properties in the "Printout Report" tab under "Results" → "Palette." If you set this as default, the graphics in the printout report are updated automatically.

• ### Where are the user-defined cross-sections saved and how is it possible to access them?

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#### Answer

There are two ways to enter the cross-sections to the RFEM/RSTAB that are not included in the cross-section library.

1. Cross-Section Programs SHAPE‑THIN and SHAPE‑MASSIVE

The user-defined cross-sections can be created by means of the cross-section programs SHAPE‑THIN or SHAPE‑MASSIVE. The SHAPE‑THIN or SHAPE‑MASSIVE cross-sections can be imported using the cross-section library. To do this, click the "Import Cross-Section from Program SHAPE-THIN" or "Import Cross-Section from Program SHAPE MASSIVE" in the "New Cross-Section" dialog box (Figure 01). In this dialog box, it is possible to select and import any cross-section. Please note that the cross-sections must be calculated and saved in SHAPE‑THIN or SHAPE‑MASSIVE before importing the cross-section properties. It is only possible to import each cross-section individually.

2. Creating User-Defined Cross-Section in RFEM/RSTAB
If the cross-section properties of the manufacturer are known, they can be created in the cross-section library of RFEM/RSTAB using the option "Create New User-Defined Cross-Section" (Figure 02). In contrast to the cross-sections created with SHAPE‑THIN or SHAPE‑MASSIVE, it is not possible to design these user-defined cross-sections in the add-on modules, such as RF‑/STEEL EC3, because the data necessary for the design, such as c/t-parts, is missing.

To access the user-defined cross-sections, click the "Load Saved User-Defined Cross-Sections" button in the cross-section library (Figure 03).

The user-defined cross-sections from all models are saved in the EigProf.dat file. Even in the case of a version upgrade (for example, from X.19.XXXX to X.20.XXXX), these cross-sections will be imported. The storage location of the user-defined cross-section library can be determined using the program options (Figure 4). It is possible to copy a user-defined profile database already created on one workstation and paste it into the respective directory of the other workstation. The user-defined cross-sections are thus also available on the other workstation without having to import them again.
• ### We have recently got the following error message on my laptop. Can you tell me what we can do to solve the problem?

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#### Answer

Maybe the user-defined cross-section library EigProf.dat on your computer is missing or it is corrupted. Please open the "Data Files" tab of the program options and select the "User-Defined Cross‑Section Library" category.

Open the displayed directory and check whether the EigProf.dat file is available. If the file is available, please rename it.

If the path including the file in the program options does not correspond to the default path for RFEM 5.xx "C: \ ProgramData \ Dlubal \ RFEM 5.xx \ General Data \ EigProf.dat", set this default path in the program options.

• ### Is it possible to save layer structures in a file in the RF‑LAMINATE add-on module and distribute this to other computers?

#### Answer

The user-defined layer structures from the RF‑LAMINATE add-on module can be saved in any *.lyr file.
• ### Where can I find the stiffness matrices of orthotropic surfaces?

#### Answer

In the case of user-defined matrices, the stiffness matrices of orthotropic surfaces are saved in the MatrixConstants.cfg file in the C:\ProgramData\Dlubal\Global\General Data folder. The folder requires the standard installation!
• ### Is it possible to transfer a user-defined value spectrum to all load cases or load combinations?

#### Answer

The automatic transfer to all load cases or load combinations is unfortunately not possible. However, you can save the customized settings and import them in other load cases.

To do this, it is necessary to open the dialog box for editing the isoband value and color scales and specify the user-defined settings. Then, click "Save..." to save these settings.

This isoband value scale is now available in all load cases and combinations and can be selected.

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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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