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Frequently Asked Questions (FAQ)
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AnswerYes, that is possible. Simply select the structure to be copied. Make sure that the line releases and all released objects are also selected. Now you can create a copy with the 'Move and Copy' function.
Figure 01 shows an example. As you can see, the same contact stresses are generated at each location of the surfaces and thus the elastic foundation springs have been applied correctly everywhere.
Since line hinges are internal line releases, the same applies to the line releases.
AnswerAs of the RFEM version 5.17, there is the graphical result display (only available for line hinges and line releases) as well as the result display in tables. The latter can be found in the following tables:
- 4.45 Line Hinges - Deformations
- 4.46 Line Hinges - Forces
- 4.47 Member Hinges - Deformations
- 4.48 Member Hinges - Forces
- 4.49 Nodal Releases - Deformations
- 4.50 Nodal Releases - Forces
- 4.51 Line Releases - Deformations
- 4.52 Line Releases - Forces
You can create such a connection by using a line release. In Figure 01, you can see an example model where Wall 1 should only transfer compression forces to Wall 2.
First, it is necessary to open the dialog box for creating a line release (Figure 02). In the dialog box (Figure 03), you can now select the lines for the release and the type. The type must also be created. The coordinate system of the line specifies the direction, so that "Fixed if positive vy" must be selected (Figure 04).
Figure 05 and Figure 06 show the effect of the line release in two load cases.
AnswerYou can model a scissors hinge between surfaces by means of line releases. In the attached model, a line release has been created on Line 5, which releases Surface 3 and Surface 4. Since Surfaces 3 and 4 also refer to the newly generated Line 8 automatically, the scissors hinge is defined correctly.
The result diagram of a line release (Figure 1) or a line hinge (Figure 2) can be displayed by right-clicking the relevant line release or line hinge. From the shortcut menu, select the "Result Diagrams" entry.
The video shows how the results of a line release/a line hinge can be displayed in the work window and in the "Result Diagrams" dialog box.
AnswerBasically, elements in RFEM are rigidly connected with each other. To solve this problem, RFEM provides two elements. The line hinges and the line releases. The difference is explained in the link below.
If you define line loads on a line that is decoupled from the overall system, that line becomes semi-rigid. The program checks this incorrect entry and gives a hint (Fig. 1). However, there are structures where this line is kept at a different point. In this case, the program continues to calculate after the user has confirmed the note. However, since the deformation for such a decoupled line becomes very large, it is not displayed in the graphic output.We generally recommend not to load lines that are decoupled via a Line release or Line hinge.The theoretical background will be explained in this Article.
No, that's not possible yet. However, there is also the possibility of evaluating the line release directly via RFEM. Although no utilization is indicated with this method, it is suitable for assessing the transmitted forces.The resultants for the results of line hinges and line releases can be displayed via the results navigator under the entry "Releases". In this case, a distance-related evaluation (see Fig. 01) or the consideration of the total value (see Fig. 02) is possible.
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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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