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Frequently Asked Questions (FAQ)
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AnswerYes, it is possible. Usually, only individual members of a large system are exported to perform detailed analyzes on them. You can find more information about this export in another FAQ (see Downloads below).The export of a member with loads is shown in the attached video.
AnswerIn order to carry out the import in RFEM/RSTAB by using the DSTV interface, the program requires the nodes where the cross-sections can be located.It often happens, that members are only selected in the case of the "Export only selected objects" option (Figure 02). In this case, the nodes are missing in the selection. The model cannot be created.Therefore, you have to select all objects that are necessary for the description of the model by using the "Select" → "Related Objects" option (Figure 03). Then, the import is carried out properly.
AnswerThe 'Simulate and Generate Wind Loads' function for exporting models to RWIND Simulation is available in RFEM or RSTAB from version x.21.01 of 22.10.2019.With a valid service contract you can download the current program version from your Dlubal account. It is enough to log in here:If you do not have a service contract, you can download the program version 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.
For the import of the *.igs or *.stp (STEP) files, the RX‑LINK add-on module is required (see Figure 01). The export is currently not possible.
Furthermore, it is possible to import a model with the CAD/BIM option. After selecting the file to be imported, it can be activated in the Options tab of the "New Model - General Data" dialog box (see Figure 02). This option allows you to additionally convert the geometric elements directly into members, surfaces, or solids after the import (see Figure 03).
As CAD software, SolidWorks currently provides the output via the IGES and STEP interfaces, which can be imported by our software, but cannot be exported. For the greatest possible comfort, the CAD/BIM option should be activated (see the link).
Furthermore, it is also possible to exchange data via DXF files. In this case, RFEM is also able to export or import 3D structures and surfaces.
AnswerIf you are using members with the cross-sections that are not known by the interface, you should use the conversion file for the cross-sections. This mapping file can be easily filled with the names of the cross-sections. In the left column of the table, write the names of the cross-sections used in TEKLA, and in the right column, write the DLUBAL names or select them from the library.Please watch the attached video.Note:
In TEKLA, you have to have the right environment. In the video, Chinese cross-sections should be transferred, so the Chinese environment has to be used in TEKLA.
AnswerWith a time course monitor, you can view all results over a period of time. In this case, it is also possible to select several parts of the structure and then export the results directly to Excel.
AnswerIt is possible to export the effective lengths from the add-on module to Excel as shown in Figure 01.
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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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