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Frequently Asked Questions (FAQ)
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AnswerWith the FE mesh refinement, it is also possible to create an aligned FE mesh in the program. Thus, the automatic FE mesh generator can be controlled to a certain extent. However, it is not possible to set a specified mesh geometry with it.
Yes, it is possible.You can do this by selecting the check box under "Use Required Reinforcement for Serviceability Design" in the "Longitudinal Reinforcement" dialog box "1.4 Reinforcement".Thus, the module places the entire reinforcement that is required for the ultimate limit state design for the ultimate limit state and / or serviceability limit state into a reinforcement layer.The results output "Additional Reinforcement" is omitted after the design in the results windows in the add-on module as well as in the printout report.The option "Use Required Reinforcement for Serviceability Limit State Design" can be combined with the option "Automatically Increase Required Longitudinal Reinforcement for Serviceability Limit State Design."
AnswerThe load from the form-finding load case (FF) is impressed 1.0-fold into the system. If you want to factor in the self-load in combination with combinatorics, you can additionally create a permanent load case for the self-load with a load of 0.35 times the load.
This discrepancy is often caused by changing DIN 1054 to EN 1997.In the 'old' DIN 1054, the design was performed by using the characteristic values on the action side and the allowable stress on the resistance side. The actions were used without partial factors and compared with certain allowable stress. In this case, the 'eta' resistance was completely included in the allowable stress.In the predecessor module of RF‑FOUNDATION Pro, which performed the calculations according to DIN 1054, there was a special tab 'Ground Failure Analysis (Service Loads)' for this purpose.In the Eurocode, the ground failure design is performed in a different way.Here, a partial factor is applied to the action and the resistance side. Thus, the loading is increased by the factor of 1.35 or 1.5, and the resistance is reduced by the factor of 1.4.With regard to the 'old standard', the 'eta' resistance is completely included in the 'allowable stress sigma_all'.Under the Downloads link below, you can find a model file for RFEM or RSTAB, which clarifies the problem in RF‑/FOUNDATION or RF‑/FOUNDATION Pro. Here, the design has not been performed by using the user-defined entry of the soil pressure, but using the allowable stresses from the standard case tables. There should be the same soil with approximately the same foundation dimensions resulting or the Eurocode and for the old standard.The following assumptions for the foundation have been made in both add-on modules:
When using the all. soil resistance according to DIN EN 1997‑1 from the standard case tables, the factor of 1.4 is already included. The base values Sigma‑R,d(B) of the soil resistance also differ by the factor of 1.4 compared to the allowable soil pressure 'sigma_all' (DIN 1054).Results of the comparison:Ground failure design according to DIN 1054 in RF‑/FOUNDATION (old):Ground failure design according to EN 1997‑1 in RF‑/FOUNDATION Pro:In spite of different input values, the results from DIN 1054 and EN 1997‑1 are comparable.If you want to recalculate the foundation in RF‑/FOUNDATION Pro, which has already been designed with RF‑/FOUNDATION (old), you would have to apply twice the soil pressure Sigma_R,k:Sigma_R,k (input in RF‑/FOUNDATION Pro) = 1.40 (partial factor for ground failure) x 1.35 (resistance on the load side in the example) x Sigma_all (from RF‑/FOUNDATION (old)).In the attached file, this has been done in CA2 in both add‑on modules. In this case, the allowable soil pressure has been entered as 220 kN/m² in RF‑/FOUNDATION. In RF‑/FOUNDATION Pro, 416 kN/m² has been entered.
- Cohesive soil
- Pure silt - UL
- Stiff consistency
- Embedment depth of the foundation t = 1.50 m
Font sizes and fonts as well as the page margins that are displayed in the printout report can be defined in the "Page Setup" dialog box.
Should it happen here that columns are shifted into each other or the text overlaps, it is recommended to check if the problem can be solved by resetting the settings to "Settings" → "Page Setup".
The "Design Details" button is only available or can be selected if the required reinforcement has been selected from the ultimate limit state (ULS).As soon as the governing reinforcement consisting of ULS and SLS or only the SLS is shown in the results tables, the "Design Details" button is grayed out.You can select the design details for the serviceability limit state in Tables 3.1 - 3.3.
AnswerIt is difficult to enumerate one or particular reasons for the deviations. Basically, the design in RF-CONCRETE Columns is an analytical method, the nominal curvature method according to EN 1992-1-1 5.8.8. One advantage here is that it is a standardized method and that all intermediate values of the calculation are output in the add-on module.With the help of the intermediate values, you can search for the cause of a deviation between different design programs.If you can not find the cause, please contact our hotline. In this context, however, we need a printout including the input and intermediate values from the program used for the comparison.
Frequently used functions and commands can be accessed by already implemented keyboard functions. For example, if you want to print a graphic, the corresponding shortcut is [Ctrl] + [P].
For a complete list of keyboard functions, see the attached link .
If no dialog box is active, press the [Enter] key to open the last used function. Thus, reapplication of data is easier (placing model or load objects once more in the work window, for example).
In RFEM, it is possible to define a surface grid for the results output. The grid can be related locally to the surface or to a global point in the coordinate system. Thus, it is possible to refer the grid to the same origin for each surface. However, you have to define this setting individually for each surface.
The video illustrates the procedure.
AnswerThe license drivers are digitally signed. If you try to install a new license driver that is missing in the existing signature of your operating system, a message appears.
To solve this problem, please perform a Windows update. After restarting the operating system, the installation should be completed.
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