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• ### When evaluating line supports in result combinations, it is possible to select an average for the "sum of result combination" and the "displayed mean values." What does the "Sum of Result Combinations" feature include?

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The easiest way to explain the function is to use an example. The example file can be downloaded under "Downloads" at the end of this FAQ.

• In Load Case 1, the following support reaction results for the "Actual" distribution:

• Also in Load Case 1, the following distribution results for "Smooth Distribution" (constant):

• In Load Case 2, the following distribution results for "Actual":

The next step is to consider an additive RC with the following definition:
RC 1 = LC1/s or LC2/s

If you now look at the "Sum of result combinations" setting, you get the following distribution for RC1:

LC1 ... smoothed value = 5 kN/m ... here the max value of RC1

LC2 ... smoothed value = 4 kN/m ... here the min value of RC1

Now, we switch to the max value of RC1 and the actual distribution of the support reactions in the Results navigator:

The mean value of the values shown in the previous image is no longer 5.0 kN/m, but 5.80 kN/m.

If you now evaluate the min value of RC1 with the "Mean value of displayed values" option, the result is a value of 3.2 kN/m instead of 4.0 kN/m described above.

Thus, the setting in the Display navigator has an influence on averaging the results from the additive RCs.

• ### Why is it not possible to select a load case for design in the RF‑/STEEL add-on module, although it is defined in RFEM/RSTAB?

Perhaps is the calculation of the corresponding load case deactivated in RFEM/RSTAB, see the image.

After you activate it correspondingly, the load case should be available for selection in the add-on module.

• ### How do I display the load combination description according to an action category, such as "D, L, W" instead of "LC1, LC2, LC3"?

In the Program Options menu, under Program tab, you can check the "Combination description according to action category" to display "D, L, W" instead of "LC1, LC2, LC3."

• ### Is it possible to display the load cases and load combinations related to a result combination that lead to the maximum/minimum result?

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The corresponding load cases and load combinations can be displayed in result tables. For this, select the "Corresponding Load Cases" option in the "Table Filter" dialog box (Image 01). To open the dialog box, use the menu Table → View → Result Filter or the corresponding button in the table toolbar (Image 01).

In RSTAB, the corresponding load cases/combinations can be displayed in the following tables:

• 4.1 Members - Internal Forces
• 4.2 Sets of Members - Internal Forces
• 4.3 Cross-Section - Internal Forces
• 4.4 Nodes - Support Forces

In RFEM, the corresponding load cases/combinations can be displayed in the following tables:

• 4.1 Nodes - Support Forces
• 4.4 Members - Local Deformations
• 4.5 Members - Global Deformations
• 4.6 Members - Internal Forces
• 4.7 Members - Contact Forces
• 4.11 Sets of Members - Internal Forces
• 4.12 Cross-Sections - Internal Forces
• ### Why is it not possible to use result combinations in RF‑STABILITY? It is possible in RSBUCK indeed.

While the existing axial force in members is used for the eigenvalue analysis in RSBUCK, the external load is increased until failure for the stability analysis in RF‑STABILITY. Thus, in contrast to RSBUCK, no linear eigenvalue analysis is provided and you can only use load cases and load combinations, see the figure.

• ### Can I create a user-defined load or result combination despite the automatic load combination?

Yes, you can. To do this, simply click the "New Load Combination" or "New Result Combination" button in the "Load Combinations" or "Result Combinations" tab, and define them as desired, see Figure 01.

• ### How can I define individually or simultaneously acting load cases from different actions?

The following procedure applies to the definition of individually or simultaneously acting load cases from different actions:

• Activate the automatic combinations in General Data, see Figure 01.

• Open the "Edit Load Cases and Combinations" dialog box, the "Combination Expressions" tab: Activate the "Individually/Simultaneously Acting Load Cases" option and make the desired setting, see Figure 02.
• ### In my structure, there are three load cases on the left, which should act alternatively with each other, and three load cases on the right, which should act alternatively with each other. However, the individual load cases should be combined with those on the other side. How can I set such conditions?

First, activate the automatic combinations in General Data.

Then, activate the "Differently" action in the "Actions" tab of the "Edit Load Cases and Combinations" dialog box, so that the individual load cases can be divided into groups (see Figure 01). The assignment is made in the "Group" column using the list that you can access by clicking in this column.

Afterwards, you can check these set options in the "Load Combinations" tab, see Figure 02.

• ### When starting the calculation, a message appears saying that the maximum number of 9,999 load cases and combinations has been exceeded. What can I do?

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The number of load cases and combinations calculated at one time is limited to 9,999. This limitation can be avoided by using the "To Calculate" option, which allows you to select the cases to be calculated. Thus, load cases and load combinations can be divided into several groups with a smaller number of cases.

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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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