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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Yes, it is possible to also perform punching shear designs for vertical walls.
Please note, however, that this feature was not available in the first versions of RF‑PUNCH Pro. For this, you will need RFEM 5.08 or later.
Yes, it is possible in Window "1.5 Punching Nodes."
For example, this can be used if the determination of the punching load by using the smoothed or unsmoothed distribution of shear forces in the control perimeter is negatively affected by singularities.
The RF‑CONCRETE Columns add-on module allows you to define a "creep-producing permanent load." You can find the corresponding tab in Window "1.1 General Data."
The reason for the entry is that RF‑CONCRETE Columns can apply this "creep-producing permanent load" for the automatic determination of the effective creep ratio according to EN 1992‑1‑1, 5.8.4.
In contrast, there is no explicit input option for this creep-producing permanent load in RF‑CONCRETE Members. In RF‑CONCRETE Members, the stability analysis of reinforced concrete columns by means of nonlinear design does not automatically reduce the effective creep ratio. You can find the background to the effective creep ratio applied in RF‑CONCRETE Members in Chapter 2.4.6 of the RF-CONCRETE Members manual.
The same applies to the CONCRETE Columns or CONCRETE add-on modules for RSTAB.
RF-/FOUNDATION Pro is a further development of the RF‑/FOUNDATION add-on module.
The main differences are as follows:
- Design according to Eurocode instead of DIN
- Additional foundation type "Block foundation with smooth bucket sides," see Figure 1:
- Input of a soil profile and settlement calculation, see Figure 02:
Yes, it is possible. To do this, activate the 'Name' option, see Figure 1.
Yes, it is possible. For this, open Window 1.5.
If there are too few nodes selected for design, so that the program cannot determine the dimensions lx or ly automatically according to DIN EN 1992‑1‑1, 6.4.5 (NA6), Figure NA 6.22.1, a message appears, saying that the conditions for determining the minimum bending moments are not fulfilled.
The program requires at least 4 nodes to determine the span lengths in the x- and y‑direction.
In this case, you can define the minimum bending moments manually.
RF-CONCRETE Columns determines the equivalent moment M0e from the moment M02 at the column head and M01 at the column base according to EN 1992‑1‑1, 18.104.22.168 (2), and performs the design according to the model column method with this equivalent moment M0e.
Now, it may happen, for example, that a computationally larger required reinforcement area would result from the cross-section design with the moment M01 at the column head.
To ensure this, message 28) is displayed, according to which the user should perform a standard design with the internal forces according to the linear static analysis. To do this, simply open the RF‑CONCRETE Members add-on module and perform pure design of the internal forces according to the linear static analysis for the member designed in RF‑CONCRETE Columns.
In the case of cross-section design, RF‑CONCRETE Members or CONCRETE uses in the calculation the stress-strain diagram for reinforcing steel according to DIN EN 1992‑1‑1, 3.2.7(2)a, that is, the increasing upper part up to ftk and the strain limitation of εud = 0.025.
In RF‑CONCRETE Members or CONCRETE, there is no option to switch to the design with the horizontal part according to 3.2.7(2)b.
However, you can possibly use a user-defined material with ftk = fyk.
In RF‑PUNCH Pro, you can select for design the nodes where the concentrated load is applied as a "nodal load."
- Free concentrated loads cannot be applied here as the location of the free concentrated loads is not defined by a node, but by their coordinates.
- The nodes subjected to a nodal load can only be picked once a load has been selected for design.
After the calculation, you can switch to the result window "2.4 Required Reinforcement by x‑Location" in the RF‑CONCRETE Members (RFEM) or CONCRETE (RSTAB) add-on module.
Here, you can select a certain result row for a particular design and x-location (upper table in Window 2.4). Then, you can evaluate the intermediate results in the lower table in Window 2.4. This covers the "Neutral Axis Depth x", for example. The location of the neutral axis for the selected design location is displayed in the graphic on the right of Window 2.4 .
Furthermore, you can display the distribution of the neutral axis depth along the member length graphically in the model or in "Result Diagrams on Member."
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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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