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Frequently Asked Questions (FAQ)
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RWIND Simulation is exclusively compatible with RFEM due to the CFD modeling, which requires a finite element calculation. The model created in RSTAB can be opened in RFEM. The wind load parameters can be defined in the Simulate and Generate Wind Loads dialog box of RFEM.
At the bottom of the Wind load tab, it is possible to remain and automatically generate loads for the corresponding load cases the CFD calculation has been performed in the background.
If you would rather perform the wind simulation in RWIND, click the Open in RWIND Simulation button in the Load Cases tab.
To obtain the trial version of RWIND Simulation, proceed as described in this FAQ.
The structural system shown in Figure 01 is loaded by using the load generator.
The result is shown in Figure 02. Due to the different member lengths, there are not the same load magnitudes resulting on both beams. Figure 02 also shows the graphical load distribution. The rectangular connection of the members to the bisector is considered as the load application length. This corresponds exactly in both cases.
Figure 03 also shows the check by means of a surface system. These are also consistent with the member model.
AnswerThe [Generate Loads → From Area Load on Members via Plane...] function requires to generate the defined plane from a continuous line. If the curved member is generated from arcs, the plane as a polygon cannot find the outline of the arc, because it is only an approximation. In short, curved members cannot be loaded by using the load generator in RFEM.In this case, it is recommended to create the curved member by using several straight member segments. Thus, the continuous line can be run cleanly. In order to quickly create the corner nodes of the polygon chain, it is recommended to prepare them in Excel, for example, depending on the number of member segments. In this case, the numbering of nodes is important. The procedure is shown in the video.
AnswerFor irregular member structures, the load generators "From Area Loads on Members via Plane" or "via Cells" can be helpful. However, both functions assume that the nodes of the members are located in one plane. In the settings of the load generators, it is possible to increase tolerances for the nodes to also detect the nodes lying outside the plane (see Figure 01). In combination with the "virtual lines," it is possible to load even more complex structures.
If a cell closed on all sides is detected in the structural model, it can be used for the load application. However, if the desired load range is not completely enclosed by members, the cell is not recognized by the load generator.
The "Nodes on virtual lines" function allows you to define the corner nodes of the load area manually, and thus clearly define the cell area. The cell defined in this way can then be selected as usual by using the pick function of the individual cell nodes.
AnswerIf the general National Annex of EN 1991‑1‑3 is selected, the program allows you to enter any value.
AnswerIn the load generators, you can exclude the individual members from the area load generation by means of the "Remove influence from" feature, and thus specify the stress direction.
Drifted snow loads can be generated according to EN 1991‑1‑3, 5.3.4 (3) with the load generator. In addition to the load cases for non-drifted snow, it is also possible to quickly define load cases for the drifted snow.
For this, it is necessary to create a separately generated load for each section of the roof. Furthermore, the sides on which a drift occurs must be selected in the load generator (see the video).
Yes, that is possible. The "Generate Loads → From Surface Load to Openings" function allows you to do just that (see Figure 1). For the load, you can select in which direction the load should act, the area load distribution, the area load direction, the load distribution type, and of course the surface load (see Figure 2).
Thus, it is possible to set the loads e.g. for non-load bearing elements such as windows or the like.
I have generated member loads from area loads via planes horizontal to the plane of a multistory frame. Each cell contains a truss as a diagonal. Although the diagonal has been excluded from the load, the member load distribution is linear in different directions after being disconnected on both posts.
What is the reason and what should be done to apply the same member load on both posts?
Once you select the corresponding members in the "Remove influence from" section, there will be no load applied accordingly.
However, the load is still generated while considering these members. In this case, the diagonals are the reason for the antimetric arrangement of the cells subjected to the load. Accordingly, the member load diagrams are linear in the opposite directions (see Figure 01).
There are two options to obtain symmetrical or constant diagrams of the member loads:
- Select the "Constant" load distribution type for the uniform distribution (see Figure 02).
- Select the "Do not use any unloaded member for cell generation" option to only obtain the symmetric distribution (see Figure 03).
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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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