Frequently Asked Questions (FAQ)

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• Is it possible to copy line releases?

New FAQ 004315 EN-US

Answer

Yes, that is possible. Simply select the structure to be copied. Make sure that the line releases and all released objects are also selected. Now you can create a copy with the 'Move and Copy' function.
• Is Dlubal certified according to ISO 9001 and where can I find the corresponding certificates?

New FAQ 004295 EN-US

Answer

Dlubal Software GmbH is certified according to DIN EN ISO 9001: 2015.

The scope includes the development, testing, sale, and support for structural planning and FEM.
• Are the Revit and Tekla models that you've shown in "Webinar 3: BIM Integration and RFEM" available for free use and can you send them to me?

New FAQ 004289 EN-US

Answer

Yes, the data is freely available. You can find the structures in the download section of this FAQ.
• Are the models and presentations from Info Day 2015 freely available, and can you send them to me?

New FAQ 004284 EN-US

Answer

Yes, the data is freely available. Use the following download option to load the presentations and finished models of the consultants.
• In RF-GLASS, it is not possible to design a curved pane. Why?

New FAQ 004263 EN-US

Answer

When modeling a glass pane, in particular, an insulating glass pane, special attention must be paid in RFEM that the boundary lines consist of only four lines.
A division of the lines should be, if possible, avoided because then the calculation can no longer be performed. A corresponding warning message will be displayed before the calculation.
If special intermediate nodes are required on the line, make sure that they do not divide the original line during the creation.
If the line gets nevertheless divided, the structure can be restored by using the 'Delete Node and Connect Adjacent Members' command.
In exceptional cases, the use of the layered mesh can be deactivated in the composition details. This option has been specifically implemented for double-curved panes.
• Why are the results of the load cases e.g. of the load case self-weight not identical with the first construction stage in the RF-/STAGES module?

New FAQ 004249 EN-US

Answer

If identical settings are defined in the main program, the missing consideration of the material-related partial safety factor in the load case is often the reason (Figure 1).

In the RF-/STAGES module, all calculations are always carried out, taking into account the partial safety factor. If not considered, it must be set specifically for the material.
• Is it possible to define different stiffnesses for tension and compression between two surfaces in the diagram of a line release?

New FAQ 004243 EN-US

Answer

It is possible to define different properties in the tension and compression area of a line release as shown in Figure 01.

However, it is necessary to consider a special feature regarding the released surface when releasing lines between two surfaces. The attached model involves an identical line release. The bottom surface 1 is released for the left model, but the top surface 4 for the right model. For both surfaces, the local y-axis of the surface is aligned parallel to the global z-axis.

The deformation diagram results in completely different deformations for both models.

In the left model with the lower released surface, the pressed area is very soft. For this axis orientation, the reaction force of surface 2, which presses surface 1 from above, is very soft.

In the model on the right, the upper surface is released, so that the reaction force of surface 4, which presses surface 3 from above, is very stiff.
• Which cross-sections can I design in the RF-/TIMBER Pro add-on module?

FAQ 004218 EN-US

Answer

Basically, all cross-sections of the solid and hybrid cross-section groups can be designed in the RF-/TIMBER Pro program. In Figure 01, they are displayed on the right.

For more complex asymmetrical cross-section shapes, it may be necessary to adjust the allowable inclination of principal axis on a user-defined basis in the add-on module (see Figure 02).

• What is the meaning of 'Shear Failure in Glued Contact Surface' in the details of the RF-LAMINATE add-on module?

New FAQ 004206 EN-US

Answer

In the case of cross laminated timber panels not glued to the narrow sides and a wall-like structural behaviour, the torsion stress in the glued joints is often decisive. This design is performed according to the explanations in the literature reference below according to the following equation.

$\eta_x=\frac{\tau_{tor,x}}{f_{v,tor}}+\frac{\tau_x+\tau_{xz}}{f_R}=\frac{\displaystyle\frac{3\ast n_{xy}}{b(n-1)}}{f_{v,tor}}+\frac{{\displaystyle\frac{\frac{\partial n_x}{\partial x}}{n-1}}+\tau_{xz}}{f_R}\leq1$

Values:
• b board width
• n number of board layers
• nxy shear in pane plane
• $\frac{\partial n_x}{\partial x}$ shear of board layers
• $\tau_{xz}$ shear in thickness direction
• fR rolling shear strength
• fv,tor torsion shear resistance
For the y-direction, the design is analogous but with the values for the y-direction.
• Is it possible to save a file in a previous version of RSTAB 8 or RFEM 5?

New FAQ 004203 EN-US

Answer

No, this is unfortunately not possible.

If you save the last version of your model in RSTAB or RFEM, it is done in the currently used version.

However, you can also open RSTAB 8 files in RSTAB 7 and RSTAB 5 files in RFEM 4. Please pay attention to the notes in FAQ004112 in the link below.

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First Steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

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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