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Frequently Asked Questions (FAQ)
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AnswerFor surfaces in RFEM, the results are always displayed in the grid points. If the grid layout is not set correctly, it may happen that no such result is available for individual surfaces. Consequently, no result value is displayed in the graphic and the surface is missing in the results table.In general, it is sufficient to reduce the spacing of the grid points. For an optimal output and graphical display, you can also adjust the surface grid in the surface's editing window. To do this, double-click the surface to open the "Edit Surface" dialog box. There, select the "Grid" tab.The following basic settings for the surface grid can be adjusted here:
When selecting a user-defined grid type, you can additionally specify the following options:
- Grid type Cartesian or polar
- Number and spacing of grid points per direction
- Origin of grid
- Grid rotation
- Orientation of grid axis
By default, DIN A4 is preset as print format in portrait orientation. To adjust these settings, click the "Set Printer" button, which can be found in the printout report, among other places (see Figure 1).
Editing the page size and the sheet format of individual pages of the printout report is currently not possible.
AnswerThe function transfers the deformation from one LC or a LC into the other LC or another CO. The internal forces and stress states are not transferred.Insofar as the load case or load combination is based on the same structural system, no significant internal forces should result. The FE division in the structure can have an influence here and must be checked, if necessary.If the initial strain is transferred into a load case or a load combination that is based on another structural system, additional internal forces may result due to the prevented deformation (restraint). In the example (Figure 02), the initial strain of two consecutive single-span girders is transferred to a continuous beam. The deformation on the intermediate column is prevented and a moment is generated (Figure 03). The magnitude of the resulting moment can be understood by cutting free the structure and applying the prevented deformation as an imposed deformation on the load side.
First, set the National Annex to "DIN".Thus, the option "For the Standard Case According to DIN EN 1997-1, A6.10" is available. See Figure 01.The user can set here whether it is a "cohesive" or "non-cohesive" soil. In the "Details" dialog box, you can enter additional settings for the rule case tables and look at the values for the allowable soil pressure. See Figure 02.The values in the default case table can not be edited.
For the stability design of arbitrary cross-sections, the add-on modules RF- / STEEL EC3 Warping Torsion (add-on module for RF- / STEEL EC3) and RF- / FE-LTB (stand-alone add-on module) are particularly suitable.By using the calculated critical value, you can determine branch loads and perform a design according to the second-order analysis.
Please check the load.Due to the lifting load, the foundation base is probably not overpressed.In this case, RF- / FOUNDATION Pro outputs a design criterion of "-" with the note "Design Not Required."
For members, RFEM shows the corresponding internal forces in addition to the maximum values and the minimum values in a result combination. Due to the large amount of data, surface anomalies only display the maximum values and the minimum values for each grid point. The corresponding internal forces for a maximum value or minimum value are not shown.
Consequently, RFEM calculates all load cases, load combinations, and result combinations contained in the result combination for the results evaluation and lists the maximum and minimum values accordingly. If you want to have the corresponding internal forces for a result value of the result combination, search for the elements contained in the result combination and compare them with the corresponding value.
If the load case or load combination is found, the corresponding internal forces are also displayed for each grid point of the surface.
For a faster evaluation, you can also use the COM interface.
With the option "with shear coupling", the stiffness of the section is calculated as a connected cross-section. This means that the thickness t * represents a completely welded cross-section.With the option "Without shear coupling", two independent cross-sections are calculated.
Member internal forces are always output with reference to the member axes or the principal axes. An output with reference 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 a stress distribution in the tension zone before initial cracking (coefficient k c according to EN 1992-1-1 7.3.2 (7.2.)), Which depends on the external loading (Figure 01). That is, by default, k c is variable.
Depending on the state of stress (for example, pure bending, bending and tension, bending and compression, and pure tension), the minimum reinforcement can vary across the surface.
However, it is also possible to adjust the presetting. It is thus possible to select a bending constraint (k c = 0.4) or a centric constraint (k c = 1.0) (Figure 02).
As soon as a constant value for k c 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)
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