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Frequently Asked Questions (FAQ)
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The *.dll and *.tlb files were probably not updated correctly on your computer. Please proceed as follows:
1. Rename the following folders in Dlubal.bak:
C:\Program Files (x86)\Common Files\Dlubal
C:\Program Files\Common Files\Dlubal
2. Reinstall RFEM or RSTAB.
3. Move the files from the newly created Dlubal folders to the respective Dlubal.bak folders (overwrite all).
4. Rename the Dlubal.bak folder to Dlubal.
AnswerIn principle, a section is an element, such as a member, and is also created in the same way. First, the interface to the objects is required. For a member, this would be IModelData, and for sections, it would be ISections. This interface can be found in IModel3:Sub test_section()' get interface from the opened model and lock the licence/programDim iModel As RFEM5.IModel3Set iModel = GetObject(, "RFEM5.Model")iModel.GetApplication.LockLicenseOn Error GoTo EDim iSecs As RFEM5.ISectionsSet iSecs = iModel.GetSections()All sections created previously are deleted first, and then two new sections are created.The first section should be a solid section with a visible sectional area (see Figure 01). The data are entered in a similar way as in RFEM. As a type, "SectionOnSectionalArea" is selected, the corner points of the section are set by using "EdgePoint," and a "Vector" defines the direction of the section:' first delete all sectionsiSecs.PrepareModificationiSecs.DeleteObjects ("All")iSecs.FinishModification' set section on solidDim sec As RFEM5.Sectionsec.EdgePointA.X = 2sec.EdgePointA.Y = 5sec.EdgePointA.Z = 0sec.EdgePointB.X = 2sec.EdgePointB.Y = 8sec.EdgePointB.Z = 0sec.no = 1sec.Name = "solid section"sec.Plane = GlobalPlaneInPositiveXsec.ShowValuesInIsolines = Falsesec.Type = SectionOnSolidSectionLinesec.ObjectList = "1"iSecs.PrepareModificationiSecs.SetSection seciSecs.FinishModificationAs already known from other elements, the new section is finally transferred in a Prepare-/FinishModification block. As the second section, a surface section is to be created (see Figure 02). For this, it is necessary to use the "SectionViaSurfacePlane" type. In addition to the vector of the section direction, you have to select the display plane of the results for the surface section. In the following example, the xy plane is selected by setting "GlobalPlaneInPositiveX."' set section on surfacesec.EdgePointA.X = 2sec.EdgePointA.Y = 0sec.EdgePointA.Z = 0sec.EdgePointB.X = 2sec.EdgePointB.Y = 3sec.EdgePointB.Z = 0sec.no = 2sec.Name = "surface section"sec.Plane = GlobalPlaneInPositiveXsec.ShowValuesInIsolines = Truesec.Type = SectionViaSurfacePlanesec.ObjectList = "1"sec.Vector.X = 0sec.Vector.Y = 0sec.Vector.Z = 1iSecs.PrepareModificationiSecs.SetSection seciSecs.FinishModificationIt is also possible to get the results of a section by using the separate method "GetResultsInSection" of the "IResults2" interface. In the following, the shear forces on the surface section are obtained. The distribution of the internal forces is set to "Continuous within Surfaces" by means of "ContinuousDistributionWithinObjects":' get resultsDim iCalc As ICalculation2Set iCalc = iModel.GetCalculationDim iRes As IResults2Set iRes = iCalc.GetResultsInFeNodes(LoadCaseType, 1)Dim secRes() As RFEM5.SectionResultsecRes = iRes.GetResultsInSection(2, AtNo,ShearForceVy,ContinuousDistributionWithinObjects, False)Under Downloads, you can find the Excel macro and the test file to comprehend the program.
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/programDim iModel As RFEM5.IModel3Set iModel = GetObject(, "RFEM5.Model")iModel.GetApplication.LockLicenseOn Error GoTo e' get interface for calculationDim iCalc As ICalculation2Set iCalc = iModel.GetCalculation' create array with loading typesDim loadings(3) As Loadingloadings(0).no = 1loadings(0).Type = LoadCaseTypeloadings(1).no = 4loadings(1).Type = LoadCaseTypeloadings(2).no = 4loadings(2).Type = LoadCombinationType' calculate all loadings from the array at onceiCalc.CalculateBatch loadingse: If Err.Number <> 0 Then MsgBox Err.description, , Err.SourceSet iModelData = NothingiModel.GetApplication.UnlockLicenseSet iModel = NothingEnd Sub
AnswerIn most cases, the problem is that the finite elements of the cover surfaces are very close to each other in the edge area of the cushion when using Bézier surfaces. The FE mesh nodes of the bottom and top surface might be combined then. In principle, there are two approaches:1. Numerical solution of the problem:You can adjust the tolerance for combining FE mesh nodes by using the menu "Tools" → "Regenerate model."2. Geometrical solution of the problem:A more workable solution is to increase the distance between surfaces by using the boundary surfaces as shown in Figure 01.
AnswerWhen using the COM interface (RF‑COM or RS‑COM), you can create a comment by using the guide object interface IGuideObjects. The following is an example program that creates a comment:Sub test_comment()' get interface from the opened model and lock the licence/programDim iModel As RFEM5.IModel3Set iModel = GetObject(, "RFEM5.Model")iModel.GetApplication.LockLicenseOn Error GoTo eDim iModelData As RFEM5.IModelData2Set iModelData = iModel.GetModelDataDim iGuiObj As RFEM5.IGuideObjectsSet iGuiObj = iModel.GetGuideObjectsDim comm As RFEM5.Comment' set frame typecomm.Frame = CircularFrameType' set reference object typecomm.ObjectType = GeneralObjectTypecomm.ObjectNo = 1' set point if GeneralObjectType is choosencomm.Point.X = 2comm.Point.Y = 4comm.Point.Z = 6' set offset from reference objectcomm.Offset.X = 0.5comm.Offset.Y = 1comm.Offset.Z = 1.5comm.Rotation = 1' set text of commentcomm.Text = "testcomment"' transfer object to programiGuiObj.PrepareModificationiGuiObj.SetComment commiGuiObj.FinishModificatione: If Err.Number <> 0 Then MsgBox Err.description, , Err.SourceSet iModelData = NothingiModel.GetApplication.UnlockLicenseSet iModel = NothingEnd SubThe selection of the reference or the element to which the comment is refferred to is defined by the type (ObjectType) first. Here, it is possible to select, for example, a member, a node or any point in space. Next, the number of the reference object is specified via ObjectNo (for example, Member 1). If you have selected a free point, it is set by Point.Finally, you can specify an offset which results from the reference object.
Since there are only the directions x- and y- in the plane for surfaces, it is first necessary to define which should be the hoop stress and which the axial stress. In the following example, sigma_x should be the axial stress and sigma_y the hoop stress.
The example consists of an inclined circular container (Figure 01). After the modeling, the program tries to align the local axis systems on the global axis system (Figure 02). However, the x‑axis should run along the container for all surfaces in this case. This orientation can be achieved as follows.
First, the z‑axis of all surfaces must point inwards or outwards. In the example, the outside direction has been selected. If this is not the case for the surface, you can right-click the surface and use the "Reverse Local Axis System" feature to move the z‑axis to the other surface side. Then, select all surfaces and open the Axes tab in the Edit Surface dialog box. Figure 03 shows the dialog box. In this case, one of the boundary lines oriented axially has been selected. Figure 04 shows the aligned local axis systems now. All x-axes are axial and all y-axes run in the circumferential (hoop) direction.
Figure 05 shows the results of the membrane stresses axial (sigma‑x,m) and along the circumference (sigma‑y,m).
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.
An imperfection is considered as a load and is transferred via the interface of the load case. Provided that the interface to the model has already been imported, the interface to the loads (ILoads) followed by the interface to Load Case 1 (ILoadCase) will subsequently be imported, if it has already been created before:' set loadcasesDim iLoads As iLoadsSet iLoads = model.GetLoads' get load caseDim iLc1 As ILoadCaseSet iLc1 = iLoads.GetLoadCase(1, AtNo)' define imperfectionDim imperf As Imperfectionimperf.Comment = "test"imperf.Direction = LocalZTypeimperf.Inclination = 200imperf.no = 1imperf.ObjectList = 1imperf.Precamber = 300imperf.PrecamberActivity = ActivityAccording_EN_1993_1_1' set imperfectioniLc1.PrepareModificationiLc1.SetImperfection imperfiLc1.FinishModification
The data of the imperfection is then filled out first, here for Member 1, and then transferred within the Prepare-/FinishModification block of the Interfaces load case.
To modify an existing element, you have to get the interface to the corresponding element, in this case on an example of a member:Dim iModel As RSTAB8.modelSet iModel = GetObject(, "RSTAB8.Model")iModel.GetApplication.LockLicenseDim iModData As IModelDataSet iModData = iModel.GetModelDataDim iMem As RSTAB8.IMemberSet iMem = iModData.GetMember(1, AtNo)
Use this code to get the interface to Member 1, which should already be created. Then, you can use the .GetData () method of the interface to get the member data.
If you want to modify the data (such as the member rotation here), you can subsequently transfer it to the program within the Prepare-/FinishModification block with the method .SetData ().Dim mem As RSTAB8.Membermem = iMem.GetDatamem.Rotation.Angle = 0.5mem.Rotation.Type = RSTAB8.AngleiModData.PrepareModificationiMem.SetData memiModData.FinishModification
AnswerThe following code shows how to get different calculation parameters via the COM interface. It also shows how to specify the setting for deactivating shear stiffness:' get model interfaceSet iApp = iModel.GetApplication()iApp.LockLicense' get calculation interfaceDim iCalc As RFEM5.ICalculation2Set iCalc = iModel.GetCalculation' get surface bending theoryDim calc_bend As RFEM5.BendingTheoryTypecalc_bend = iCalc.GetBendingTheory' get settings for nonlinearitiesDim calc_nl As RFEM5.CalculationNonlinearitiescalc_nl = iCalc.GetNonlinearities' get precision and tolerance settingsDim calc_prec As RFEM5.PrecisionAndTolerancecalc_prec = iCalc.GetPrecisionAndTolerance' get calculation settingsDim calc_sets As RFEM5.CalculationSettingscalc_sets = iCalc.GetSettings'get calculate optionsDim calc_opts As RFEM5.CalculationOptionscalc_opts = iCalc.GetOptions' set ShearStiffness to falsecalc_opts.ShearStiffness = FalseiCalc.SetOptions calc_optsUnder Downloads, you can find the EXCEL macro.
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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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