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• ### How can I create a member end release with a "diagram" using the COM interface?

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In order to create a nonlinear element such as a member end release with a diagram or failure, it is necessary to create the member end release first. If RFEM knows the member end release, it can be obtained using the IMemberEndRelease interface. This interface uses the methods GetData() and SetData(). Both methods are able to read out or write a simple member end release data of the MemberEndRelease type as well as the nonlinearity data.

In the following example, the release is first activated for the x-direction in the member end release, and then the WorkingDiagramType is set as the nonlinearity in the x-direction. After transferring these data to RFEM using the Prepare-Finish-Modification block, it creates the nonlinearity internally. To enter the data, the existing data is first obtained from the interface of the member end release using GetData().

After entering the data (NonlinearityDiagram), it is transferred again using SetData():

Sub SetNLDiagram()Dim model As RFEM5.modelSet model = GetObject(, "RFEM5.Model")On Error GoTo eDim iApp As RFEM5.ApplicationSet iApp = model.GetApplicationiApp.LockLicenseiApp.ShowDim iModelData As RFEM5.iModelDataSet iModelData = model.GetModelData'   modify member end release'       set nonlinearity "Diagram" for x translationDim iMemHing As RFEM5.IMemberHingeSet iMemHing = iModelData.GetMemberHinge(1, AtNo)Dim memHing As RFEM5.MemberHingememHing = iMemHing.GetData()memHing.TranslationalConstantX = 0memHing.TranslationalNonlinearityX = WorkingDiagramType' Set new dataiModelData.PrepareModificationiMemHing.SetData memHingiModelData.FinishModification'       create diagramDim tbl1() As DoubleReDim tbl1(1, 1)tbl1(0, 0) = 0  '   u-xtbl1(0, 1) = 0  '   P-xtbl1(1, 0) = 0.02  '   u-x (mm)tbl1(1, 1) = 2000  '   P-x (N)Dim nldHing As RFEM5.NonlinearityDiagramnldHing.ForceType = StiffnessDiagramForceType.NoneStiffnessForcenldHing.PositiveZoneType = DiagramAfterLastStepType.TearingDiagramTypenldHing.PositiveZone = tbl1nldHing.Symmetric = TrueDim iNldiag As RFEM5.INonlinearityDiagramSet iNldiag = iMemHing.GetNonlinearity(AlongAxisX)'       Set new dataiModelData.PrepareModificationiNldiag.SetData nldHingiModelData.FinishModificatione:      If Err.Number <> 0 Then MsgBox Err.description, , Err.Sourcemodel.GetApplication.UnlockLicenseEnd Sub

The procedure is similar for nodal supports and other nonlinearities.

• ### Unfortunately, the trial period of my trial version of RFEM 6 / RSTAB 9 has already expired. How can I continue to test the new Dlubal products?

In the case of already successfully completed test phases, we can only offer a reduced test phase.

If you are interested in a particular add-on, you can always contact one of our sales representatives to allow for an individual adjustment of the trial license(s) of the desired products/add-ons.

• ### What is the fastest way to create a contact between two surfaces?

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In RFEM 5, a contact solid was required to create a contact between two surfaces. In RFEM 6, this can be done using a surface contact:

1) Define a surface contact type: Either in the Data navigator under "Types for special objects" or directly within the surface contact under "Special objects" → "Surface contact," see Image 01.

2) Assign the corresponding surfaces and the surface contact type to the surface contact, see Image 02.

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• ### Why are the free line loads not displayed completely at certain locations after copying them, for example?

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In this case, please pay attention to the correct assignment of the corresponding surface, see the image.

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• ### How can I optimize cross-sections within the steel design?

The cross-sections to be designed can be optimized as follows:

Select "Steel Design" and "Input Data" in the RFEM table window. Then, select the "Optimize" option in the "Use Other Section for Design" column of the "Sections" tab, see Image 01.

Now, you can perform the design again for this cross-section. Since the internal forces can change with new cross-sections and thus new stiffnesses, there is the option to export the optimized cross-sections to RFEM/RSTAB using the shortcut menu, see Image 02.

The described cross-section optimization only applies to the standardized cross-sections. For further optimization, we recommend the Optimization & Costs add-on.

• ### Can I also use RWIND 2 with RFEM 5/RSTAB 8?

Yes, you can use RWIND 2 Basic with this program generation as of the version RFEM 5.27.01 / RSTAB 8.27.01.

All you have to do is to change the solver version to RWIND 2 in the wind load settings.

If RWIND does not start, run RFEM or RSTAB as administrator and try again.

• ### What is the meaning of the two terms "Factorize provided reinforcement" and "Optimize provided reinforcement" in the concrete design?

These are two different methods for calculating the required longitudinal reinforcement.

• Factorize Provided Reinforcement

The entire provided longitudinal reinforcement (compression and tension reinforcement) is equally scaled with a factor. This means that the reinforcement in the compression and tension zone has the same factor.

• Optimize Provided Reinforcement

The provided longitudinal reinforcement is divided into the upper and lower reinforcement (compression and tension reinforcement) and is scaled with different factors. This option allows you to only scale the required tension reinforcement accordingly, while any non-required reinforcement in the compression zone is set to zero.
• ### I cannot create a new file. The menu item is grayed out. What can I do?

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Please check whether you have started the licensed main program or opened the viewer by mistake.
The viewer is only used to view files and is license-free. If you want to create files, you have to run the licensed main program.

If there is no longer any link, you can copy the link to the viewer and then remove the addition/viewer in the properties.

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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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