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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In this case, "EC2 for RFEM" is not an add-on module that you can run separately, but a standard according to which you can design reinforced concrete structures in RF‑CONCRETE Surfaces or RF‑CONCRETE Members, for example.The selection of the design standard can be found in the "General Data" dialog box of the respective add-on module.The same applies to "EC2 for RSTAB."A design standard, here "EC2," is required in the following add-on modules:- RF-CONCRETE in RFEM 5- CONCRETE in RSTAB 8- RF-/CONCRETE Columns in RFEM 5 and RSTAB 8- RF-PUNCH Pro (only available for RFEM 5)
AnswerBoth RFEM and RSTAB provide a suitable solution. In addition to Eurocode 2, the international standards, such as ACI 318, CSA A23.3, SIA 262, or GB 50010, are also available for the design in both programs.
With the add-on modules for designing columns or foundations, or for punching shear designs, it is possible to quickly and reliably calculate the structural components.
Main Programs RFEM or RSTABThe main programs RFEM or RSTAB are used to define structures, materials, and actions.
For reinforced concrete structures, RFEM is clearly the first choice as it allows you to also create structural systems consisting of plates, walls and shells in addition to spatial frame structures. RFEM is the more diverse variant as it can be equipped and extended with the corresponding add-on modules for all materials and designs.
- Eurocode 2 (EN 1992-1-1)
- SIA 262
- ACI 318
- CSA A23.3
- GB 50010
- RF-/CONCRETE Columns
Reinforced concrete design according to the model column method or the nominal curvature method
- RF-PUNCH Pro
Punching shear designs of surfaces
- RF-/FOUNDATION Pro
Design of single, bucket and block foundations
- RF-CONCRETE Deflect (RFEM)
Analytical deformation analysis
- RF-CONCRETE NL
Realistic deformation analysis of surfaces and members
Dynamic AnalysisIf it is necessary to perform seismic analysis or vibration designs of a building, the RF‑/DYNAM Pro add-on modules provide special tools for determining natural frequencies and mode shapes, for an analysis of forced vibrations, a generation of equivalent loads, or for a nonlinear time history analysis.If you have any question about the Dlubal Software programs, please do not hesitate to contact the sales department.
AnswerYou can usually set the standard and the National Annex in the top right corner of an add‑on module (see Figure 01). In most cases, it is also possible to display the factors of the National Annex and edit them, if necessary (see Figure 02).
AnswerNo, this is unfortunately not possible.The program concept of RF‑CONCRETE Surfaces is designed in such a way that it is always necessary to place the reinforcement on the top and the bottom layer.You can try to concentrate the individual reinforcement layers in the center of the surface, if necessary. However, make sure that the individual reinforcement layers do not "touch" each other. Otherwise, an error message appears. See Figure 01.
In RF-CONCRETE Surfaces, you can use the [Info] button to display the corresponding steel stresses for each design location for the ultimate limit state (see Figure 01). A graphical display is not possible here.
For the serviceability limit state design, it is possible to display the steel stress graphically as the corresponding design can be performed (see Figure 02).
When creating a new cross-section in RFEM/RSTAB, there are various cross-section types available for selection in the "Parametric - Massive" category. If you stay with the mouse cursor on the button for a while, an information appears, indicating in which add‑on modules you can design this cross-section (see Figure 01).
The cross-sections marked in green in Figure 01 can be designed with CONCRETE (RSTAB) and RF‑CONCRETE Members (RFEM). On the other hand, a "Pi‑section, type A," is not suitable for the design with CONCRETE or RF‑CONCRETE Members. As you can see in the info, the cross-section can be analyzed with RF‑TENDON. Therefore, you can select this cross-section for a member in RFEM and design it in the RF‑TENDON Design add‑on module.
Why it is not possible to design all cross-sections in CONCRETE or RF‑CONCRETE Members?
It is because of the reinforcement layers available for the individual cross-section types: for example, if you create and design a rectangular cross-section, you will find the corresponding reinforcement layer in Window 1.6 of CONCRETE, it means the possible reinforcement distribution (see Figure 02). There are various reinforcement layouts possible for a rectangular cross-section. These reinforcement layers are required to determine stresses and strains in the cross-section and thus the required reinforcement.
For other cross-sections, such as Pi‑sections, this information is not available in the current state of development. Therefore, they cannot be designed with CONCRETE or RF‑CONCRETE Members.
If the SHAPE‑MASSIVE program is licensed, you can create the structural system with a Pi‑section in RFEM/RSTAB and determine the governing internal forces. In SHAPE‑MASSIVE, it would then be possible to define the cross-section, to import the internal forces from RFEM/RSTAB and to design the cross-section according to the manual specification of longitudinal reinforcement.
Further information about SHAPE‑MASSIVE can be found under the following link: https://www.dlubal.com/en-US/products/cross-section-properties-software/shape-massive
SHAPE-MASSIVE allows you to freely define thick-walled cross-sections.
RF-CONCRETE Surfaces displays failed design at some locations in Window 2.1 because the concrete compression stress is too high there (see Figure 01). In this window, you can also use the [Info] button to check the design details for a result row selected in the table above. Based on the values shown in a new window, it is obvious that the membrane force resistance is smaller than the design membrane force in the strut direction (see Figure 02).
As a result, the program displays a corresponding message "not designable" on all finite elements with too great concrete compression stresses.
The theoretical background to this design can be found in the manual of RF‑CONCRETE Surfaces, among others. You can download it using the link under Reference or open it in the module by pressing the [F1] key.
In order to prevent non-designable situations, you can follow this procedure:
- The failed design may be caused by a singularities.
- If there is no pure slab, the optimization of internal forces may be the cause. This should be deactivated in the case of shells and slabs (Figure 03).
- It may be helpful to add a third reinforcement direction (Figure 04).
- The concrete quality can be increased.
- The surface thickness can be increased.
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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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