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Frequently Asked Questions (FAQ)
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AnswerRhino 7 will be supported as of the program version 5.25.01. You can install the plug-in as follows:1. Go to the following folder, depending on your system:32-bit system: "C:\Program Files\Common Files\Dlubal\DLInstaller"64-bit system: "C:\Program Files (x86)\Common Files\Dlubal\DLInstaller"2. Run DLInstaller.exe.3. In the "Registration" tab, select your program version and click "Register."4. If this does not solve the problem, please send us the report that is generated via "Show Log."
I would like to import a large, curved surface from Rhino into RFEM, but I get the following error message: "Command: ExportToRFEM5. Nodes compare tolerance is set too low. You could adjust it by document units settings. Export error. Error to write data, message: Coordinate Z is out of range. Export to RFEM finished." How can I fix this error?
Meshes are not supported in RFEM because they are not "smooth surfaces," but consist of individual facets, see the third paragraph under Meshes vs. NURBS:
A mesh represents 3D surfaces as a series of discreet facets, [...]
As an appropriate solution, we recommend to use the Rhino command "MeshToNurbs."
The resulting polysurface can be exported to RFEM.
It may happen that the files with very long names are not recognized and the message shown in the image appears.
In this case, we recommend to rename the dxf file accordingly, or shorten the length of the description.
In this case, you should pay attention to the following steps:
- In Window 2.3 "Required Reinforcement by Point," select the "In Grid Points" option, see Image 01.
- Export the results using the "File" menu → "Export Tables," see Image 02.
AnswerIn times of BIM, data exchange between the various disciplines of construction is becoming increasingly important. Since each software has its own specifications with regard to the descriptions of cross-sections and materials, RFEM and RSTAB provide conversion tables that are available in the "Detail Settings" tab of the import and export dialog box. There, you can define the material and cross-section descriptions for the import and export. Dlubal's own descriptions can be easily selected from the extensive material and cross-section library. If necessary, the conversion tables can be easily distributed to any workstation in your office.Cadwork and RFEM should be able to handle the cross-sections mutually, if they are correctly defined in the conversion table.To ensure that the descriptions match, the following procedure is recommended:
- Create and export the cross-section in cadwork.
- Open the .stp file with the editor, and check which description is used for the cross-section.
- Enter this description in the conversion table of RFEM.
- Create and export the cross-section in cadwork.
AnswerIn AutoCAD, you can create two different types of SPLINES - either with approximation points or control vertices. RFEM supports the first one. These are imported as B‑spline lines.The second line type, however, corresponds to the NURBS lines. Although they can be modeled in RFEM 5, the interface does not support this type. The control vertices are applied as "approximation points" for the definition of a B‑spline. This results in a different shape.As a workaround, it is therefore possible to modify the corresponding lines. The most suitable line type is probably the Bezier-Spline.
The stand-alone program RWIND Simulation currently only allows the import of the STL and VTP model geometries. On the other hand, the IFC models can currently only be imported to RWIND Simulation by using the integrated interface in the program RFEM or RSTAB. For this, proceed as follows:
- Create a new RFEM or RSTAB model.
- In General Data, activate the "Enable CAD/BIM Model" option under the Options tab.
Image 01 - Activating CAD/BIM Model Environment
- Use the "Import New Model - IFC" function in the Project navigator to import the desired Reference View IFC model under the "CAD/BIM Model" tab.
Image 02 - IFC Import
- Model a pseudo-surface without the influence of the wind geometry within the IFC model body.
- Open the "RWIND Simulation - Simulate and Generate Wind Loads" interface under the "Calculation" menu.
- Specify the wind to be applied in the "Wind Load" tab.
- In the "Settings" tab, select the "Export Surrounding Model" and "CAD/BIM Models" options in the "Export to RWIND Simulation" section.
Image 03 - Export of CAD/BIM Model to RWIND Simulation
- In the "Load Cases" tab, select the wind direction to be analyzed and open the RWIND Simulation environment using the "Open in RWIND Simulation" function.
- Use the imported IFC model in RWIND Simulation.
Rib elements are not considered for either the import or export option with REFM to Revit. Ribs are converted to "beam" elements in either scenario.The comparison in Figures 1 and 2 between the rib element in RFEM vs Revit can be seen.The eccentricity is applied but it is not listed as a rib element and does not include integrated widths.
You can import the values from Excel into a line grid using Copy (Ctrl+C) and Paste (Ctrl+V).
First, copy the desired values in Excel using Ctrl+C. Then, click in the target area in the table of the line grid. You can then insert the values using Ctrl+V. Answer the "Replace data" query with "All" (Figure 01).
The video shows how to import the coordinates of a line grid from Excel. Furthermore, it shows how to add another line grid coefficient.
In RSTAB, the import formats shown in Figure 01 are available, and in RFEM, the import formats shown in Figure 02. To open the dialog box for importing a file, use the menu File → Import.
Furthermore, there are direct interfaces to other numerous applications. A detailed overview of the interfaces is available on our website Building Information Modeling (BIM).
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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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