In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
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From the internal forces solely, no optimization can be derived: Whether a cross-section is sufficient or not can only be determined by a calculation according to the respective standard (using the add-on modules).
The cross-section design and/or stability analysis and/or SLS design may require a modification of the cross-section. Furthermore, the cross-section modification also changes the stiffness of the entire structure or also affects the adjacent components (for statically indeterminate systems). Therefore, a fully automatic cross-section optimization cannot be solved by the program.
It is not possible to set that the cross-section of an element should be changed in the way that the adjacent structural components are not overstressed or that an entirely optimized structure is found. It is only possible to optimize the component that is currently subjected to design. For this, see the online manual of RF‑/STEEL EC3 (which shows the member design).
In the case of surface components, only the surface thickness can be automatically optimized from the stress analysis.
The "RF‑/STEEL Cold-Formed Sections" add-on module allows you to design cold-formed L‑sections, Z‑sections, C‑sections, channels, top‑hat sections, and CL‑sections from the cross-section library.Furthermore, it is also possible to design general cold-formed (not perforated) SHAPE‑THIN 9 cross-sections.
A 1D element (member) cannot be directly integrated into 3D elements of a solid. However, there are the tools that allow for a coupling.
If a slender component (member) is to be connected with a solid component (solid), it is necessary to pay attention to the correct coupling of these elements when modeling.
1. For example, if a column with an end plate is rigidly bolted to a single foundation, this can be done by means of a "cross connection." Thus, the problematic rotational degrees of freedom may be transferred by translational degrees of freedom. The dimensions of the "cross connection" should correspond approximately to the dimensions of the cross‑section.
2. For example, if a member is encased in a single foundation, the solid should be separated in the member plane in order to ensure the connection between the member and the boundary surface and thus the connection with the solid.
In order to print the image without loads and without reference to a load case, it is necessary to hide all results and loads.
Only if there is no text in the title and max/min info, the image is printed without any reference in the printout report.
The panel may have been placed in the background. You can easily deactivate this function (see the figure).
However, it is also possible that the panel has been accidentally docked at the bottom of the screen (below the table). The video shows how you can dock the panel to any edge of the screen again with just a few clicks.
AnswerAll crane loads always refer to the respective axle of the crane. In the program, the entered loads are then distributed automatically to the number of wheels by axle. You can also check the applied loads very quickly and easily by using the 3D rendering.
The fastest way is to use a result beam. For the sake of convenience, you can place it directly next to the building.
The function of the result beam is to transfer all internal forces of members, surfaces, and solids to a beam element in order to obtain the internal forces for the entire structure referred to a beam. The result beam allows you to display the resulting shear force for each floor in the X- and Y-direction.
After defining the result beam, you can view the internal forces integrated into the result beam. The internal forces Vz and Vy are important for the evaluation. The maximum of the shear force is visible on the bottom side of the result element which takes into account the entire structure.
The shear force for each floor is always determined by the difference between the upper and lower value. It is necessary to use a sufficiently fine division of the result beam (Calculation Parameters → Global Calculation Parameters → Number of divisions of members for - Result diagrams), and to define a sufficiently fine FE mesh as this can sometimes have a strong impact on the result accuracy.
When printing a graphic with the "window filling" setting, all objects of the window content, which can be displayed absolutely, are printed in the printout report. However, the variable objects, such as the text of dimensions or comments, do not limit this graphic because the text is scaled according to the zoom setting.
It is usually very easy to check whether all objects meet this requirement: To do this, activate the display of light positions in the Project Navigator - Display. All objects that are now within the dashed box are usually also shown in the printout report.
As an alternative, you can also use the "As screen view" setting for the graphic printing in such a case.
AnswerA completely rigid support is not possible. The maximum values of the translational, shear, and rotational springs are limited as follows:Translational springC1,x 1.0 × 108 kN/m²C1,y 1.0 × 10 9 kN/m²C1,z 1.0 × 109 kN/m²Shear springC2,x 1.0 × 108 kNC2,y 1.0 × 108 kNC2,z 1.0 × 108 kNRotational springCφ 1.0 × 108 kNm/rad/m
AnswerRFEM uses OpenGL for the graphical display. If available, RFEM uses the hardware acceleration of the graphics card. If this does not support hardware acceleration, RFEM uses the software implementation of Windows OpenGL.In the case no hardware acceleration can be used, the graphical display is considerably slower. The extent to which this has a negative effect on the usability of RFEM depends on the size of the processed RFEM models.For many (not all) hypervisors, it is not possible to use the hardware-accelerated OpenGL. RFEM would basically run in the virtual machine. However, the graphic display would be slower.We recommend to test on a typical RFEM model whether the speed of RFEM in the virtual machine is acceptable.Please note that our Support can only help you to a limited extent when using virtual machines.
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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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