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Frequently Asked Questions (FAQ)
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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.
RF-/FOUNDATION Pro is a further development of the RF‑/FOUNDATION add-on module.
The main differences are as follows:
- Design according to Eurocode instead of DIN
- Additional foundation type "Block foundation with smooth bucket sides," see Figure 1:
- Input of a soil profile and settlement calculation, see Figure 02:
Yes, it is possible. To do this, activate the 'Name' option, see Figure 1.
The reason for this warning might be overlapping surfaces, which can occur when for example one solid is modeled onto another, see figure 1.
In order to avoid overlapping surfaces, an opening is required here. After defining that opening, also check if the definition of the solids have to be corrected.
This setting can be made in the RF-LOAD-HISTORY add-on module under ‘Details’ → ‘Options’ → ‘Deformation Type’, see Figure 01.
The deformation type 'In Particular Load Step' displays the deformations of each individual load step separately, the deformation type 'On Undeformed Structure' shows the sum of all load steps.
In this case, the reason for four result lines (see Fig. 01) is that a minimum and a maximum including the associated remaining internal forces are output for each selected internal force.
- First line: Numerical maximum of Vz (3.54 kN) with corresponding internal forces
- Second line: Numerical minimum of Vz (0 kN) with the corresponding internal forces
- Third line: Numerical maximum of My (0 kNm) with corresponding internal forces
- Fourth line: Numerical minimum of My (-12.37 kNm) with corresponding internal forces
It is very likely caused by missing uniform staff orientation, see Figure 1.
As soon as the member orientation is uniform (right-click on the member → 'Reverse Member Orientation'), the signs of the shear force diagram also match, see Figure 2.
In the main program RFEM/RSTAB, a member rotation of 90° is first required so that the lamellae of the glued-laminated beam are arranged on edge, see Figure 1.
To also consider the on-edge position of the beam in the design in the RF-/TIMBER Pro add-on module, increase the resistance for edgewise bending within the parameters set in the National Annex in the tab 'Other Settings 2/2', see Figure 2.
Most likely, the error is in the selection of the cross section:
For a steel design, a thin-walled flat steel cross-section should be selected instead of a rectangular solid cross-section, see Figure 1.
The reason for the high shear stress of a solid cross-section is caused by the existing stress points of the cross-section or by the corresponding thickness of this stress point.
In the case of a thin-walled flat steel cross-section, there are four stress points at the corner points of the cross-section with the corresponding thickness t = 10 mm, see Figure 2.
For a solid cross-section, however, there is another stress point in the center, where the maximum of height h or width b is assumed as the thickness t for this cross-section type. In this case, the width b is 200 mm, see Figure 3.
This results in a small torsional section modulus Wt and a correspondingly high shear stress.
Therefore, the solution is, as described above, to select flat steel within the main program.
In this case, start the project manager from the respective program (RFEM, RSTAB ...). If the project manager is started directly from RFEM, only RFEM files are displayed by default, see 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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