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Frequently Asked Questions (FAQ)
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AnswerDownload the following link:Then:(1) Please close RFEM and Rhino.(2) Open the ZIP folder and double click the *.rhi file.(3) Select the "Anyone who uses this computer" option in the Rhino Package Installer.
The lines in a .dxf file can be imported as lines or members. You can select the "Create Members" option in the "ASCII Format DXF (*.dxf)" tab of the import dialog box (Figure 01).
When importing members, the names of layers are transferred as cross-section names, and the first predefined material is assigned. If a cross-section of the Dlubal cross-section library and a material from the Dlubal material library are recognized from the layer name, they are transferred. The layer name must be specified in the format [Cross-Section Name]$[Material Name] (for example, IPE 300$Structural Steel S 235 JR).
The import of lines/members is shown in the video.
The reason this warning appears is because it is not possible to import 3D solids into RFEM from AutoCAD. Only 1D and 2D members can be imported in from AutoCAD to RFEM. The reason for this is because only line elements can be imported so with 3D solids they could not be automatically generated.
AnswerThe "Simulate and Generate Wind Loads" feature for exporting models to RWIND Simulation is available in RFEM or RSTAB as of the version x.21.01 from 22.10.2019.With a valid service contract, you can download the current program version from your Dlubal account. Simply log in on this page:If you do not have a service contract, you can download the program version that you have purchased on the following page:
After the successful installation of the interface, the RFEM5 toolbar is available. The corresponding components allow you to control the export to RFEM. To do this, simply drag and drop them into the programming interface. The import from RFEM is not possible.The "RFEM 5 COM Component" allows for communication between Grasshopper and RFEM. As soon as you use this component with the geometrical information, the export will begin. An opened RFEM file is expected. It is recommended to use an empty file because the export overwrites all information. The update mechanism is not implemented at the moment. By using "Value List," you can additionally define the unit which is used to describe the geometry. The modifications of tolerances are usually only necessary if the points have been defined very close to each other. You can enter the number to be stored for this in "Panel."The "RFEM 5 Member Component" allows you to attach additional information to the geometry (lines, curves). These are considered during the export to RFEM so that the members can be created. The material and cross-section name can be entered in a text box (panel). The member rotation can be defined in [rad] by using "Number Slider." For the definition of member hinges, it is necessary to additionally load the "RFEM 5 Member Hinge Component." The input consists of 6 degrees of freedom which can be controlled individually. For the release of a degree of freedom, it is necessary to define the value "0," and spring constants are expected in the units [N/m] or [Nm/rad]. It is not possible to change the unit. Currently, nonlinearities cannot be specified.The "RFEM 5 Surface Component" can be used in a similar way as the "Member" component. A surface is expected when entering the geometry. The material can be attached to them by using the "panel." The surface thickness can be defined in [m] by using the number slider. The stiffness type of the surface can be controlled by "Value List" with the predefined types.You can create nodal supports by using the "RFEM 5 Nodal Support Component." On the Input page, you can define the points to be supported. In this case, it is recommended to use the already existing definition nodes of surfaces or lines. All 6 degrees of freedom can be controlled. In this case, the value "0" means a release in the respective direction, "-1" means a fixed support. Spring constants can be defined in the same way as member hinges.You can download the Grasshopper file shown in the figure. It is only necessary to activate the "RFEM 5 COM Component."
In principle, it is very simple to use the interface. After the successful installation, the Dlubal toolbar is available in Rhino. This includes two icons (Export and Import)."Import" allows you to import data from RFEM to Rhino. In this case, the whole RFEM model is always imported. No update is necessary. The data is added to the existing structure."Export" allows you to export data from Rhino to RFEM. The entire structure is usually exported. If you only want to export parts of the structure, select them before starting the export. In order to perform the export, it is necessary to open RFEM and create a file. Please note that the export procedure overwrites all existing data of the opened file. Therefore, it is recommended to open an empty file.
AnswerYes, it is possible to create a video file in RWIND Simulation. Arrange the graphic on the screen and select the menu "Tools → Create Video File."
In the "Create Video File" dialog box (Figure 01), you can define the name of the video file in a separate dialog box by clicking the [Search] button. It is possible to select various video file types. Furthermore, you can also adjust the quality and the recording frequency.
Click the [Start] button to start the recording and the [Stop] button to stop it.
The description of various load combinations must not be the same, otherwise the error message shown in Figure 01 will be displayed. The relevant load combination can be taken from the error message (Load Combination No. 2 in Figure&nbp;1).
The model shown in Figure 02 contains the load combination LC1 and LC2. Both load combinations have the same description "ULS." It is necessary to change one of the two descriptions so that the import is possible.
AnswerThe import is not possible due to inaccuracies in modeling, so the error message shown in Figure 01 is displayed. The Surface 1 shown in Figure 02 is not absolutely planar. The coordinate X of Node 1 to Node 4 is not equal. If this modeling inaccuracy is eliminated, the import is possible.
AnswerIn RFEM, the graphical results are smoothed on the basis of the results at the FE mesh points. The results are transferred to REVIT on the basis of the results on the grid points. In RFEM, the grid for the surfaces is set to 0.5 m by default. In this case, set a fine grid for the surfaces, and the graphical display of the results in RFEM and REVIT is comparable.
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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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