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 the design modules of RFEM or RSTAB, you can define "Provided Basic Reinforcement" and perform a nonlinear calculation in the ultimate limit state for this reinforcement.
As a result, you obtain the utilization ratio from the nonlinear calculation assuming the provided longitudinal reinforcement.
The nonlinear calculation is already included in the CONCRETE add-on module for RSTAB. In RFEM, the RF‑CONCRETE NL add-on module is required.
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.
Yes, you can, because the nonlinear reinforced concrete design is also included in the CONCRETE add-on module for RSTAB 8. Thus, you can activate "Nonlinear calculation" in the "Ultimate Limit State" tab.
In the detail settings for the nonlinear calculation, you can select "General design method for members in axial compression acc. to second order theory."
In this case, it is important to define the imperfections in RSTAB and apply load combinations (CO) according to the second-order analysis, no result combinations (RC), for the design!
Note to RFEM 5:
In RFEM 5, the same procedure is possible in RF‑CONCRETE Members. However, RFEM requires the RF‑CONCRETE NL add-on module for the nonlinear reinforced concrete design.
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).
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 analysed 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 licenced, 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/products/cross-section-properties-software/shape-massive
SHAPE-MASSIVE allows you to freely define thick-walled cross-sections.
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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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