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Frequently Asked Questions (FAQ)
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RWIND Simulation is exclusively compatible with RFEM due to 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 RFEM dialog Simulate and Generate Wind Loads.
At the bottom of the Wind load tab, it is possible to stay and automatically generate the loads for the corresponding load cases after the CFD calculation has been run in the background.
If you would rather perform the wind simulation in RWIND, click the button Open in in the Load cases tab of RWIND Simulation.
To obtain the trial version of RWIND Simulation, proceed as indicated in this FAQ .
Yes, it is possible in Window "1.5 Punching Nodes."
For example, this can be used if the determination of the punching load by using the smoothed or unsmoothed distribution of shear forces in the control perimeter is negatively affected by singularities.
The RF‑CONCRETE Columns add-on module allows you to define a "creep-producing permanent load." You can find the corresponding tab in Window "1.1 General Data."
The reason for the entry is that RF‑CONCRETE Columns can apply this "creep-producing permanent load" for the automatic determination of the effective creep ratio according to EN 1992‑1‑1, 5.8.4.
In contrast, there is no explicit input option for this creep-producing permanent load in RF‑CONCRETE Members. In RF‑CONCRETE Members, the stability analysis of reinforced concrete columns by means of nonlinear design does not automatically reduce the effective creep ratio. You can find the background to the effective creep ratio applied in RF‑CONCRETE Members in Chapter 2.4.6 of the RF-CONCRETE Members manual.
The same applies to the CONCRETE Columns or CONCRETE add-on modules for RSTAB.
AnswerThe design points in CRANEWAY have been adopted in compliance with the standard. In this case, the stresses are calculated for the following locations:
These points are not displayed in the resulting cross-section graphic in the CRANEWAY program. However, there is always a stress point at the design points 0 and 2 for which the result values can be directly displayed.
- Design Point 0
A periphery of the flange at the web edge or at the fillet start
- Design Point 1
A flange at load application point (this can be checked as wheel spacing in Window 1.4)
- Design Point 2
The flange edge
- Design Point 0
A user-defined wind load distribution is not provided in the Eurocode. In order to implement a user-defined wind load distribution in the RF‑/TOWER Loading add-on module, this can only be done after conversion to DIN, for example, DIN 4131:1993‑11, see Figure 01, Window "1.3 Wind Load - Part 1."
Then, you can select the user-defined distribution in Window 1.4 "Wind Load - Part 2," and define it in the adjacent table, see Figure 02.
The load values of generated loads are recorded in Table "3.15 Generated Loads." It is not possible to make any changes there.
If you want to change the loads, you have to disconnect the generated loads. You can do this quickly by using the shortcut menu of the load (see the figure).
According to EN 1991‑1‑3, the snow load must be multiplied by the factor of 0.8 for the snow load on a roof. Therefore, the following load results:
sk = 5 kN/m² × 0.8 = 4 kN/m²
If the load has already been calculated for the roof, you can enter the load completely under the user-defined loads. This is shown in Figure 01 and in the video.
There is an option for this in the Results navigator of RFEM 5.
After the calculation of a load case or a CO, you can switch to the Results navigator and select the "Load Distribution" result type.
Thus, you can display the load applied in the respective element. This can also be used very well for a graphical documentation of the load and printed as a graphic in the report.
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.
In RF‑PUNCH Pro, you can select for design the nodes where the concentrated load is applied as a "nodal load."
- Free concentrated loads cannot be applied here as the location of the free concentrated loads is not defined by a node, but by their coordinates.
- The nodes subjected to a nodal load can only be picked once a load has been selected for design.
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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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