#### Further Information

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• ### In the case of sections, I do not see a smoothing line for result combinations. What can I do?

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In the default setting of the section results for result combinations, the "Max and Min values" are displayed. Smoothing is not reasonable in this case.

As soon as you change the result display to "Max Values" or "Min Values", you get the smoothing line.

• ### How can I automatically generate result combinations?

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In RFEM and RSTAB, you can automatically create combinations according to various standards. In the case of a purely linear calculation, the generation of result combinations can be defined in General Data of the model. The attached video shows the automatic generation.
• ### How can I only calculate specific load cases, load combinations, or result combinations by using a command with the COM interface?

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In order to only calculate specific load cases, load combinations, or result combinations in the same way as the "To Calculate..." command (see Figure 01), you can use the CalculateBatch method of the ICalculation interface. For the transfer, the method expects a field with the load type of Loading. This Loading includes the number of the load, and the type (for example, a load combination):

Sub batch_test()    '   get interface from the opened model and lock the licence/program    Dim iModel As RFEM5.IModel3    Set iModel = GetObject(, "RFEM5.Model")    iModel.GetApplication.LockLicense    On Error GoTo e        '   get interface for calculation    Dim iCalc As ICalculation2    Set iCalc = iModel.GetCalculation        '   create array with loading types    Dim loadings(3) As Loading    loadings(0).no = 1    loadings(0).Type = LoadCaseType        loadings(1).no = 4    loadings(1).Type = LoadCaseType        loadings(2).no = 4    loadings(2).Type = LoadCombinationType        '   calculate all loadings from the array at once    iCalc.CalculateBatch loadingse:  If Err.Number <> 0 Then MsgBox Err.description, , Err.Source        Set iModelData = Nothing    iModel.GetApplication.UnlockLicense    Set iModel = NothingEnd Sub
• ### How can I check the generated load combinations for different design situations in CRANEWAY?

In the CRANEWAY program, you can select the display of load combinations for the individual design situations in the middle of Window 1.5 Load Combinations.
• ### Is there any option to export/import a combination scheme COMPLETELY?

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You can save the manually or automatically created and adjusted combination schemes and use them in another RFEM/RSTAB file. The video shows that on a simple example.
• ### When importing an RFEM/RSTAB file into Autodesk Revit, I get the error message for the load combination saying that "The given name is not unique Parameter name: name." How can I fix the error?

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The description of various load combinations must not be the same, otherwise the error message shown in Figure 01 will be displayed. The relevant load combination can be taken from the error message (Load Combination No. 2 in Figure&nbp;1).

The model shown in Figure 02 contains the load combination LC1 and LC2. Both load combinations have the same description "ULS." It is necessary to change one of the two descriptions so that the import is possible.

• ### Why are there no resultant support forces for result combinations?

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A resultant requires a specific combination of loads that cannot be provided by result combinations.

The problem is apparent in the following example. A single-span beam is subjected to three different load cases. For the support at Node 1, the result envelope of the 6 possible load combinations gives the maximum P‑Z of 11.25 kN based on the result of CO2 (see Figure 01). The support at Node 2 has the maximum P‑Z of 12 kN, based on the result of CO1. However, the resultant of 23.25 kN does not exist in any of the involved load combinations and is therefore too large (maximum CO 1 and CO 2 with 22.5 kN).

The situation is similar to the pure result combination of the load cases which have the same maximum values P‑Z of the Nodal Supports 1 and Nodal Support 2. However, it is not apparent here that the resultant would give incorrect results.

For this reason, a resultant is not used for result combinations as the results may be incorrect.

• ### I have used the RF‑/DYNAM Pro add-on module to generate the governing result combinations of seismic loads. What is the next procedure to perform the design of the individual structural components?

With the Equivalent Loads and Forced Vibrations add-on modules, you can create the result combinations that contain the governing combinations of seismic loads. To perform the design using them, they have to be combined further on the basis of the accidental combination. This combination is defined, for example, in EN 1990, Section 6.4.3.4:

${\mathrm E}_{\mathrm d}\;=\;\underset{}{\sum_{}^{}\;{\mathrm G}_{\mathrm k,\mathrm j}\;+\;\mathrm P\;+\;{\mathrm A}_{\mathrm{Ed}}\;+\;}\overset{}{\underset{}{\sum{\mathrm\psi}_{2,\mathrm i}\;{\mathrm Q}_{\mathrm k,\mathrm i}}}$

This accidental combination has to be defined manually in RFEM. Make sure that (for a direction combination with the 100/30% rule), both created result combinations from RF‑/DYNAM Pro have to be added with the "OR" condition. Such a combination is displayed in Figure 02.

This accidental combination can then be used for further design. It is possible to evaluate the governing internal forces as well as to import and calculate this combination in the design modules.
• ### Does it make any difference for the calculation of a load combination if I set the calculation for the included load case according to the geometrically linear analysis or the second-order analysis?

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No, this makes no difference for the calculation of the load combination. It is decisive which method of analysis is set for this load combination, see Figure 01.

• ### How is it possible to make factorized combinations of a dead load in the context of form‑finding?

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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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