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• Why are certain model generators only displayed inactive/grayed out?

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To use the model generator, you may have to adjust the model type within the general data. For example, a 2D truss requires either the "2D-in XZ" or "3D" model type.

The "Edit Model General Data" dialog box is opened as follows:

• Project Navigator - Data
• Right -click on model data
• General Data
• Model type, see picture

• I have installed Halfen HDB 13.60 on my PC. The version does not seem to be compatible with RF-PUNCH Pro anymore. The interface does not work. I am using version 5.26.02 of RFEM.

Version 13.60 of Halfen HDB was released after the release of RFEM 5.26.02. Thus, version 13.60 of Halfen HDB is not compatible with versions of RFEM (up to 5.26.02).

We are working on a solution and hope to be able to offer the interface again as soon as possible.

• When solving a foundation slab under a circular tank, I do not see the contact stress in the middle of the surface. What could be the reason for this?

The problem is the setting of the governing load case, from which the determination of the vertical springs is derived. You have selected LC2, which is not suitable for this. The load in this LC is only circumferential. Therefore, the plate is lifted in the middle. The program for the middle part of the plate in the air does not determine any vertical springs, so the surface is not actually supported there.
• Where can I find detailed information about orthotropy mentioned in the manual?

You can find detailed information about orthotropy in the appendix as a PDF file for download.

• How can I create a member eccentricity using the COM interface?

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In order to be able to assign an eccentricity to a member, it is usually necessary to create it before setting the member.

Another approach is shown in the following example. First, the eccentricity is created and then assigned to an existing member via its interface:

'---------------------Sub SetEccentricity()'---------------------Dim model As RFEM5.modelSet model = GetObject(, "RFEM5.Model")model.GetApplication.LockLicenseOn Error GoTo eDim iModData As RFEM5.iModelDataSet iModData = model.GetModelData'   create eccentricityDim eccens(0 To 0) As RFEM5.MemberEccentricityeccens(0).No = 1eccens(0).Comment = "test eccentricity"eccens(0).ReferenceSystem = LocalSystemTypeeccens(0).Start.X = 0eccens(0).Start.Y = 0eccens(0).Start.Z = 0eccens(0).End.X = 0eccens(0).End.Y = 0eccens(0).End.Z = 0eccens(0).HingeAtEndNode = Falseeccens(0).HingeAtStartNode = Falseeccens(0).HorizontalAlignment = Middleeccens(0).VerticalAlignment = Bottomeccens(0).TransverseOffset = Trueeccens(0).ReferenceObjectNo = 2eccens(0).ReferenceObjectType = MemberObjecteccens(0).HorizontalAxisOffset = Middleeccens(0).VerticalAxisOffset = Topeccens(0).StartAdjoiningMembersOffset = Falseeccens(0).EndAdjoiningMembersOffset = FalseiModData.PrepareModificationiModData.SetMemberEccentricities eccensiModData.FinishModification'   add eccentricity to memberDim iMem As RFEM5.IMemberSet iMem = iModData.GetMember(1, AtNo)Dim mem As RFEM5.Membermem = iMem.GetDatamem.EccentricityNo = 1iModData.PrepareModificationiMem.SetData memiModData.FinishModificatione:      If Err.Number <> 0 Then MsgBox Err.Description, , Err.Sourcemodel.GetApplication.UnlockLicenseEnd Sub

Member eccentricities can only be transferred as a field; for this purpose, a field with only one element has been created. In the attached image, the individual elements are itemized with reference to the graphical elements.

• Is there any way to get a free student version of Dlubal Software (such as RFEM, RSTAB, RWIND Simulation) if I am not attending a university or college, but a high school, for example?

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Unfortunately, it is not. Dlubal Software requires specialized knowledge in the field of structural analysis; therefore, the student version is only available to students of technical colleges and universities teaching structural analysis, engineering mechanics, and similar subjects.

• I have a trapezoidal roof structure supported by beams. However, the moments on the beams are smaller than they should be. What could be the reason for this?

The trapezoidal sheet is modeled as an orthotropic surface. In the default setting, the arches of the trapeziodal sheet are in the x directions, which is the same direction of the IPE 120 beams.

If you set the orthotropy direction to 90 degrees, that is, perpendicular to the beams, the moments will increase. If the sheet metal arches are perpendicular to the beams, the stiffness in the second direction is very small, so the load is transferred first between the IPE 120 beams.

• What is the size of the workspace in RFEM?

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The value of the coordinates must lie in the range from -100,000 m to 100,000 m.

• Why are some load cases displayed in red in RF‑STEEL EC3?

The load cases marked in red, such as LC4 in the image, cannot be designed: Such a load case contains either no loading or imperfections only. When selecting the load case, a corresponding warning appears.
• What does the "Crack formation in the first 28 days" option means?

This setting is used to reduce the effective concrete tensile strength fct,eff. If you expect the crack formation in the first 28 days, you should reduce the effective tensile strength of concrete fct,eff according to EN 1992‑1‑1, 7.3.2 (2). You can enter the corresponding reduction factor. The German National Annex recommends to use fct,eff = 0.50 ⋅ fctm (28d). If you cannot determine a definite point of time for crack formation within the first 28 days, a tensile strength of at least 3 N/mm² for normal concrete should be assumed in accordance with the German National Annex.

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