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• ### How can I cross individual fields in a large model with bracing as quickly as possible?

New FAQ 003189 EN-US

Yes, that is certainly possible with our model generator. It can be opened in the menu bar “Tools → Generate Model — Members → Bracing in Cells.” If the program recognizes a closed cell, it is possible to generate a bracing for it by assigning a member type and a cross-section.

• ### For a cross-section cross-section taken from the cross-section library of RSTAB / RFEM, the stresses calculated with RF- / STEEL differ from the stresses of the same cross-section calculated with SHAPE-THIN. What is the reason?

New FAQ 003188 EN-US

In RF- / STEEL, the stresses are calculated on stress points of the cross-section. The stress points stored for the cross-section can be displayed in the details of the cross-section. For the cross-section shown in Figure 1, stress points are defined along the section. Thus, stress points (here stress points 1 and 9) are also present at the curves.
In SHAPE-THIN, you can only calculate stresses on elements. For point elements with which Stresses can not be calculated if they represent irregularities in the cross-section geometry such as roundings, etc. The stress points of the SHAPE-THIN cross-section are shown in Figure 2. Thus, cross-sections with point elements may show minor variations in stresses due to different stress points.
Furthermore, in SHAPE-THEN you can calculate the stresses for the most unfavorable element edge or only for the member centerlines. In RF-STEEL, the stresses are calculated exclusively on the stress points.

• ### I can not enter any cables in my model. What can I do?

New FAQ 003187 EN-US

Presumably, the model type 2D -XY is activated. The type 2D - XY is used e.g. for planar plate structures such as slabs that are stressed perpendicular to the surface plane. However, the member type “Cable” can not be selected for this model type.

If you change the model type, this member type can be selected again.

• ### For a defined free rectangular load, the selected projection plane of the load does not correspond to the load direction visible in the graphic.

New FAQ 003186 EN-US

The projection plane and the load direction are different parameters and independent of each other.

While the load direction represents the actual direction of the acting load, the projection plane, together with the corresponding coordinates of the load position, describes the plane from which the load's position is projected onto the loaded surfaces.

The graphic to the right in the "Edit Free Rectangular Load" dialog box is used for information purposes, see Figure 1.

• ### Is the modeling of a channel that is warped from the rectangular cross-section to a pipe cross-section possible by means of RFEM?

New FAQ 003185 EN-US

Yes, that is possible. How to create a model of such a component with quadrangle surfaces is shown in the video of the FAQ step by step.

• ### The new version of RFEM does not provide me with the saved printout templates that I created in previous versions. How can I transfer templates to a new version?

New FAQ 003184 EN-US

When installing a new version of RFEM, templates for the printout report should be transferred automatically. The template data is stored in the RfemProtocolConfig.cfg file, which you can find in the C folder: ProgramData Dlubal RFEM 5.xx General Data If you copy the file to the same folder in a newer version, your printout report templates will be available after reboot.

• ### Why does the "Undo Function" only work for two or three processes (after that, it is grayed)?

New FAQ 003183 EN-US

When editing a model it happens again and again that the just executed work steps have to be reversed. However, how far you will be able to undo executed work steps depends on the size of the buffer memory defined for it. In the case of a very large model with many loads and load combinations, the preset value is often insufficient.

It is therefore possible to adjust the buffer size for the undo function individually in the "Program" tab of the program options.

• ### I would like to connect a column rigidly to the beam flange. However, in the RF-/JOINTS Steel - Rigid add-on module, the beams are always connected to the column flange. How can I create a continuous beam?

New FAQ 003182 EN-US

The geometry depends on the definition of the structural components. In the "1.2 Nodes and Members" window, you determine, which member belongs to a column and which to a beam. In the default case, the program always recognizes the column as continuous structural component (see Figure 01). In order to make the beam continuous, you simply have to change the status of the individual members (see Figure 02). The given beam will be assigned the “Column” status and the given column will be defined as a “Beam”.

• ### I would like to convert the area load to line load, namely into single beams. How can I do this without using the help plane?

New FAQ 003180 EN-US

In RSTAB and RFEM, area loads can be automatically converted to member or line loads. There are 3 options available for this:

In case of converting from area loads to member loads, a plane has to be defined via corner nodes or cells, or they have to be selected in the graphics window of the cell. The area load can be applied to the entire surface or, as the case may be, to the effective area of the members or to its projection.

You can find the functions in the program under Tools > Generate Loads >

• ### Is it possible to perform the new form-finding of membrane surfaces automatically with each structural change?

New FAQ 003179 EN-US

By activating the add-on module RF-FORM-FINDING, a high-quality form-finding process is defined according to the URS method before the actual structural analysis for each element with form-finding properties. After the calculation, this process results in an optimal equilibrium shape that almost exactly reflects the specified shape-finding parameters (prestress, sag, etc.).

Since this URS method requires an iterative calculation to display results, the program provides an interactive graphic mode based purely on the force density method for pure modeling. This mode displays the resulting element shape on the basis of the stored form-finding properties stored when the elements are entered.

To avoid possible initial complications due to incompletely defined models, it is possible to switch the mode on and off at any time in the shortcut menu by using the "Show Shape" option.

The graphics mode considers all force-related form-finding inputs on member and surface elements in the determination. A stable boundary condition in the respective direction is assumed for all relevant nodes with a connected element or support definition. In addition, integrated openings in surfaces are considered for the optimized display of tent points.

This interactive form-finding is generally only intended for the graphical display of elements with applied loading and works independently of the URS form-finding, which is always done before the pure structural analysis. However, the mesh's mesh is based on the currently displayed shape and can thus be influenced by the activation of the interactive form-finding.

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