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Frequently Asked Questions (FAQ)
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The detailed settings can be made separately for each composition. Click the "Edit Composition Details" button to open it.
The detailed settings differ depending on whether you set the calculation type to "Local" or "Global" in General Data.
AnswerYes, the results can be partially exported. The export function is available for the result tables in the add-on module (as of Window 2.1).Using the example of the steel stress in SLS, it would be possible to only perform the steel stress analysis and then export the table in Window 3.3, for example.When displaying the table in Window 3.3, you can choose between FE mesh points and grid points. The grid can be adjusted as a property of the surface.
AnswerThe fire resistance design is based on the temperature course from Annex A EN 1992‑1‑2.The initial values for temperature courses cannot be adjusted in the add-on modules (RF‑/CONCRETE Members and RF‑/CONCRETE Columns). The temperature curves according to Annex A EN 1992‑1‑2 are based on the following assumptions:
- The specific heat of concrete corresponds to the specifications according to EN 1992‑1‑2, 3.2.2.
- The moisture is 1.5%. For moistures greater than 1.5%, the specified temperatures are on the safe side.
- The thermal conductivity of concrete is the lower limit value mentioned in EN 1992‑1‑2, 3.3.3.
- The emissivity value of the concrete surface is 0.7.
- The convective heat-transmission coefficient is 25 W/m²K.
AnswerThe fire resistance design with RF-/CONCRETE Columns is performed according to the simplified calculation method according to EN 1992-1-2  , Section 4.2. The program uses the zone method described in Annex B.2:The reduction of the load-bearing capacity in case of fire is represented by a reduction of the cross-section of the component and a reduction of the material strengths. The concrete zones that are directly exposed to fire and thus damaged are not taken into account for the equivalent cross-section used for the fire resistance design. The fire protection design is performed with the reduced cross-section and the reduced material properties analogous to the ultimate limit state design at normal temperature.That is: The nominal curvature method according to  , paragraph 5.8.8 is performed with the hot materials and reduced cross-section.
AnswerFor building construction, there are no specific limit values specified in the standards for the serviceability limit state design. Therefore, the limit values should be agreed with your client and, if necessary, with the respective authority. Nevertheless, there are various recommendations in technical literature, which we have also adopted as the default values.
AnswerYes, it is possible to adjust the parameters of a national annex. For this, it is first necessary to create a new user-defined national annex. The newly created annex is based on the original annex selected previously.Once the annex has been created, you can change the parameters. It is also possible to adjust the description of the national annex.The user-defined attachment is marked with "*".
AnswerSuch a feature for increasing the load up to the failure does not exist with regard to the design of reinforced concrete structures.As an alternative, you can proceed as follows:Create a separate load case or load combination for each load increment. This can be done by using load factors, for example.Then, select the individual load cases or combinations in the add-on module.After performing the calculation to the point "Provided Reinforcement" for the first time, you can adjust and save the existing reinforcement proposed by the add-on module.Finally, you can carry out the nonlinear analysis on the basis of the defined reinforcement.The existing safety or the available utilization can be evaluated graphically after the successful calculation.
AnswerFor the design on a 3D model, you should pay attention to normal forces. The normal force can affect the loading of the respective direction, but can also affect the minimum lever arm.In RF‑CONCRETE Surfaces, the smaller lever arm from both reinforcement directions is applied in 3D structures. In this context, the normal force in Direction 1 can have an impact on the required reinforcement in Direction 2.
AnswerUnfortunately, this is not possible in the current version 5.23. This option will be released in further development.If you set the footing as hinged, the program automatically sets two anchors. For rigid footing, four anchors are set.
The RF‑CONCRETE NL add-on module is a module extension of RF‑CONCRETE Surfaces.
The calculation of deformations in cracked sections (state II) with RF‑CONCRETE NL can be activated by setting the "Nonlinear" method of check in the "Serviceability Limit State" tab of RF‑CONCRETE Surfaces.
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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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