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Frequently Asked Questions (FAQ)
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AnswerIn the case of the "With shear connection" option, the cross-section stiffness is calculated as a connected cross-section. This means that the thickness t* represents a completely welded cross-section.In the case of the "Without shear connection" option, two independent cross-sections are calculated.
AnswerMember internal forces are always displayed with regard to the member axes or to the principal axes. Displaying results with regard to the global coordinate system or a user-defined coordinate system is not possible.
By default, the determination of the minimum reinforcement is based on the stress distribution in the tension zone before initial cracking (coefficient kc according to EN 1992‑1‑1, 7.3.2 (7.2.)), which depends on the external loading (Figure 01). It means that kc is variable by deafult.
Depending on the state of stress (for example, pure bending, bending and tension, bending and compression, and pure tension), the minimum reinforcement can vary along the surface.
However, it is also possible to adjust the presetting. It is possible to select a bending constraint (kc = 0.4) or a centric constraint (kc = 1.0) (Figure 02).
As soon as the constant value for kc is assumed, the minimum reinforcement is independent of the external load and is applied uniformly over the structural component.
In this context, you can also select the direction in which the force should be considered (Figure 03).
AnswerIn the case of the standard installation, the layer structures of the producers are saved under C:\ProgramData\Dlubal\RFEM 5.21\General Data.
AnswerThe user-defined layer structures from the RF‑LAMINATE add-on module can be saved in any *.lyr file.
AnswerIn the case of user-defined matrices, the stiffness matrices of orthotropic surfaces are saved in the MatrixConstants.cfg file in the C:\ProgramData\Dlubal\Global\General Data folder. The folder requires the standard installation!
For this, there are the additional options in Detail Settings of the functions "Move," "Rotate," or "Mirror," see Figure 01.
For example, if there is an annular surface to be designed, and you know the center point as well as the inside and outside radius are known, proceed as follows:
- Insert a node on the inside radius and the outside radius.
- Connect both nodes by using a line.
- Select these three objects.
- Open the "Rotate" feature.
- Activate "Lines between nodes" as well as "Surfaces between lines."
- Pay attention to the type of the connection lines that are created when rotating.
AnswerFrom time to time, RFEM displays this message in the case of quite complex models (see Figure 01). There may be some delays due to the time-intensive settings, for example, when displaying a rendering. The Help Assistant informs you thus about the settings you can do to reduce such delays.You can select three options:AutomaticThe program automatically deactivates the settings, such as the rendered view, in order to increase the performance.Show settings first ...The settings that may lead to a slow-down are displayed and can be deactivated individually (see Figure 02).Do not show this tip again.All settings remain as they are.However, this message only appears if the "Rendering time optimization" option has been selected in Help Assistant under Program Options (see Figure 03).
AnswerYes, it is possible. However, it is very important to use the correct format and the same assignment of the corresponding members in the Excel import. This works great if you export the lengths to EXCEL first and then import them again. The attached video shows this process.There are more options to change the effective lengths in the RF‑COM/RS‑COM add-on module. The add-on modules mentioned above are linked to this application.
AnswerThe files from AutoCAD Plant 3D can be transferred to RFEM by using the CAD/BIM model feature. There are the formats STEP (*.stp, *.step), IGES (*.igs, *.iges), or *ifc available; the model is loaded as a base to create the pipe in RF‑PIPING Design.
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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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