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Frequently Asked Questions (FAQ)
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The structures of the manufacturers are stored in a standard installation under C: \ ProgramData \ Dlubal \ RFEM 5.21 \ General Data.
The user-defined assemblies from the RF-LAMINATE add-on module can be saved in any * .lyr file.
Yes, that is possible. However, it is very important to use the correct identical format and the assignment of the corresponding members in the Excel import. This works great if the lengths are first exported to EXCEL and then imported again. This is shown in the attached video.There are more ways to change the effective lengths via the RF- / COM add-on module. The mentioned modules are linked to this add-on module.
You can load files from AutoCAD Plant 3D into RFEM using the CAD / BIM model. STEP (* .stp, * .step), IGES (* .igs, * .iges), or * ifc, respectively, are available, and the model is loaded as a base to create a pipe in RF-PIPING Design.
The cross-section values of a specific cross-section can be displayed by means of the COM interface. The corresponding help files are available for download in the SDK on our homepage. In the VBA, it is possible to export the cross-section information by using "GetCrSc" or "GetCrscDB." The information for an IPE 100 can be taken from the attached figure and video.
The RF-/DYNAM Pro add-on module enables an exchange of the following results by means of the RF-/COM interface:
Furthermore, it is possible to output the internal forces, deformations, and support reactions of the equivalent load cases via the RSTAB or RFEM interface. There are help files available for each output option. These files are described in this article.
- Nodal deformations (Table 5.20)
- Member deformations
- Surface deformations (RFEM)
- Nodal masses
- Effective modal mass factor
Transfer of internal forces from RSTAB or RFEM to SHAPE-THIN is only possible with the administrator rights. It is unfortunately not possible to grant access only for specific folders, etc., as this process intervenes more deeply in the operating system.
However, it is also possible in SHAPE-THIN to import internal forces from RSTAB/RFEM without activating the "Import Results from RSTAB/RFEM" function. The following options are available:
Insert internal forces via the clipboard
- In RSTAB/RFEM, you have to select and copy the corresponding internal forces in the table (see Figure 01).
- In SHAPE-THIN, you can enter the internal forces in the table (see Figure 02)
Insert internal forces via Excel
- The internal forces can be exported to Excel in RSTAB/RFEM. If you only want to export single tables, you can use the Excel button in the table toolbar to open the function. To transfer several tables to Excel at once, use the menu option File → Export. The relevant tables can then be selected in a dialog box. In Excel, you have to adjust the order of the table columns to the column arrangement in SHAPE-THIN (see Figure 03).
- In SHAPE -OVER, you can then use the "Export/Import of Table" function by using the Excel button in the toolbar of Table "3.1 Internal Forces" (see Figure 04).
- In the dialog box (see Figure 05), select the option "Import Table" and the setting "Import Table from Active Workbook". Before starting the import, the Excel Workbook has to be opened. If the "Import Table from Active Workbook" check box is not set, RFEM imports the worksheet with the name "LC [LCNo.] - 3.1 Internal forces".
The message (Figure 1) indicates that the dimensions of the model are very large. This may have the following causes:1) The dimensions of the model are indeed very large so that no further action is necessary.2) During the import, the wrong units of length were set. In this case, check the length units in the "ASCII Format DXF (*.dxf)" tab of the "Import" window and set the desired length unit (Figure 2).3) The model is far away from the origin. The model can be moved to the origin in the CAD program and then imported into RSTAB/RFEM.
The Dlubal parameters are parameters in Revit that do not exist by default. They are only enabled after the activation ("Add Parameters" -> "Start") in the different dialog boxes.This information is specific to RSTAB/RFEM and can be stored in Revit. When exporting Revit to Dlubal, you can export and convert this information from RSTAB/RFEM."Without Tension"- to be found in the analytical wall properties
- corresponds to the surface type stiffness "No Tension""Surface Support"- to be found in the analytical slab or plate properties- creates a surface support with specified spring constants in RFEM"Dlubal Name (Material)"- can be found in the user-defined material parameters- direct assignment of the Dlubal material name possible (without conversion table)"Dlubal Name (Cross-section)"- to be found in the model properties of columns or beams- direct assignment of the Dlubal cross section name possible (without conversion table)"Member Type Truss/Tension Member"- to be found in the analytical beam or support properties- corresponds to the member type Truss or Tension Member in RSTAB/RFEM
AnswerThe interface between Dlubal and Revit works internally with so-called Global Unique Identifiers (GUIDs). Revit assigns a GUID to each object. During the import and export, this GUID is transferred via the interface and added to the corresponding Dlubal object (member, surface, etc.). By using GUIDs, you can carry out updates in both directions with only those objects needing to be updated that are affected by changes. Other objects remain unaffected. This results in a better compatibility during the data exchange.The comparison assumes that each object in Revit has a corresponding counterpart in the Dlubal application. For example, Revit treats each line support individually. If a line support type is assigned to several lines in RFEM, duplicates of the line support type are automatically created when exporting to Revit in RFEM. A line is assigned to each duplicate. Then, a 1:1 comparison is possible (see Figure).Due to the described functionality of the interface with the resulting modification of the Dlubal model data, it cannot be ruled out that the results will be deleted. Therefore, it is recommended to export the model to Revit before the calculation is made. The results can be transferred retroactively within a second export process.
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