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Frequently Asked Questions (FAQ)
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AnswerIn RF‑IMP, you have selected the "Generate pre-deformed FE mesh" option. In this case, the imperfect structure is considered in the calculation by using the deformed FE mesh generated in RF‑IMP. Thus, the CO results refer to the coordinates of the pre-deformed FE mesh and not to the original position in the perfect system.To better explain this issue, I exported the coordinates of the pre-deformed FE mesh nodes from RF‑IMP to Excel. Based on this information, an imperfect structure was created in a new RFEM file and calculated according to the second-order analysis. The left window shows the deformation of the perfect structure considering RF‑STABILITY and RF‑IMP, and the right window shows the result of the imperfect structure. The results are identical.
AnswerThe axis orientation of the surfaces in your model is probably not adjusted. For a circular surface, it is recommended to specify the orientation of the axes for surfaces or the axes for results of the surfaces.You can adjust the axes for each surface. In the "Axes" tab, you can find the subtabs "Axes for Input" and "Axes for Results."The "Axes for Results" tab adjusts the axes of the surface for the results. Here you can specify the orientation of the axes using a point, for example. A great advantage of this method is that the results are not deleted when adjusting the axes.The "Axes for Input" tab adjusts the axes of the surface for the orientation and results. Here you can specify the orientation of the axes on a line, for example.The results of both axis adjustments are the same. For symmetric loading, the expected symmetric results are provided.
In the default settings 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," the smooth line is displayed.
AnswerIn contrast to the old version, the latest version includes new additions and improvements in the functionality as well as revisions. Therefore, the results of the new version would still not be viewable in the Viewer of the old version.
In general, the functioning of the Dlubal Software program versions is not retrograde. This is only valid for the normal versions for viewers.The best solution is to install the viewer of the same RFEM version on which the results have been saved.
RF-/ALUMINUM checks the symmetry of general cross-sections and compares them with the SHAPE-THIN evaluation if activating the "Determine symmetry by module and compare with SHAPE‑THIN definition" check box (Figure 01).
If both methods provide different results, the corresponding error message appears (Figure 02).
Usually, there are small inaccuracies in the SHAPE‑THIN cross-section. Thus, the cross-section Sec‑1.du9 shown in Figure 03 is not absolutely symmetrical to the Z‑axis: The Z‑coordinates of Node 1 and Node 4 as well as Node 55 and Node 60 do not match in the second decimal place.
SHAPE‑THIN classifies the cross-section as asymmetrical, but RF‑/ALUMINUM as monosymmetric to the z‑axis, so the error message shown in Figure 02 appears.
The SHAPE‑THIN cross-section should be checked for symmetry. When modeling in SHAPE‑THIN, it is useful to only display one side of the cross-section and to create the other half by mirroring. This is also shown in the video.
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.
AnswerYes, it is possible to enter the display factor manually in the panel and lock it. Thus, it remains the same when changing between the load combinations.
AnswerIf the distorted elements are so small that they cannot be detected (see Figure 01), it is recommended to "Display Mesh Quality Annotations." You can find this option in the Display navigator → FE Mesh → FE Mesh Quality. There, you can activate the annotations for the "Warning" and "Failure" elements (see Figure 02). Thus, you can immediately recognize where the location is by using the values. For larger models, it may be helpful to hide the model during the search.
Yes, it is. To do this, select the "Names" option, see Figure 01.
AnswerSimilarly to surfaces, there are various smoothing options for displaying the results of support reactions. For a nonlinear support, you should always select the actual distribution to display the results.
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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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