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Frequently Asked Questions (FAQ)
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First, check if the "design of deformation" has been activated in the settings for the calculation of the SLS designs.
Furthermore, check whether a load for the "quasi-permanent" design situation has been specified in the "Serviceability" tab of Window 1.1. By default, the calculation of deformations in RF‑CONCRETE Surfaces (with RF‑CONCRETE Deflect or RF‑CONCRETE NL) requires a quasi-permanent load.
No, the function for the shear force reduction that you know from RF‑CONCRETE Members is not available in RF‑CONCRETE Surfaces. RF‑CONCRETE Surfaces always performs the design in the respective FE mesh nodes or grid points.
In the first instance, the determination of the statically required reinforcement (ULS) is independent of the manual specification of the reinforcement areas.
However, if you want to perform the serviceability limit state checks, you have to manually assign the reinforcement to all surfaces selected for design in RF‑CONCRETE Surfaces.
Otherwise, RF‑CONCRETE Surfaces does not apply any reinforcement at the location for the SLS design. The statically required reinforcement is not applied in this case.
In the result windows 3.x, a message is displayed (for the unreinforced surfaces), saying that the reinforcement definition is not sufficient. No check is possible these surfaces.
If you have performed a calculation in RF‑CONCRETE Surfaces, the results are available on FE mesh nodes and on grid points.
If you set a user-defined result value in a surface, an interpolated value from the existing values from the calculation in RF‑CONCRETE Surfaces is displayed on the FE mesh nodes first. This interpolated value is displayed while the user-defined result value is being set (when moving the mouse pointer over the surface).
If closing the command to set the user-defined result value (ESC key), RF‑CONCRETE Surfaces recalculates this actual value at this location. As a consequence, the solver window is displayed briefly. Depending on the complexity of the calculation, this solver window is only displayed for a short time or several seconds.
Due to the initial display of the interpolated values and the subsequent calculation of the actual result value, there may be small differences.
In the case of a calculating in RF‑CONCRETE NL, the creep is applied as a reduction of the elastic modulus of of the concrete in the compression zone of the cross-section.
For more information about the differences between the analytical and nonlinear deformation analysis in RF‑CONCRETE Members and RF‑CONCRETE Surfaces, see the technical articles under the links below.
AnswerFor this, there is an option in the "Combination Expressions" tab when activating the automatic combinations, which allows you to activate the favorably acting permanent loads.
RF-CONCRETE Columns designs a provided reinforcement to perform a stability analysis using the method with nominal curvature.
However, the fire resistance design may require a higher basic reinforcement. For this, you can activate the "User-defined minimum and maximum longitudinal reinforcement" in the "DIN EN 1992‑1‑1" tab of Window 1.4 Reinforcement. Then, you can specify an increased basic reinforcement by clicking the [Edit] button.
The "Detailed Results" entry in the Results navigator of RF‑CONCRETE Members or CONCRETE is only displayed if "a" certain result type has been selected (for example, As,req,above).
When displaying several results (for example As,req,top and As,req,bottom ), the "Detailed Results" entry is no longer available.
The detailedresults refer specifically to one calculation (for example, As,T) and cannot be generated for several result types at the same time.
In RF-CONCRETE Surfaces, it is not possible to display the mass determination for an inserted or determined surface reinforcement.
In RF-CONCRETE Members, RF-CONCRETE Columns, and RF-FOUNDATION Pro, however, a reinforcement proposal is displayed, from which you can determine the steel mass.
No, this is not possible in RF‑CONCRETE Surfaces (in the current state of development).
If you have activated a basic reinforcement and/or the serviceability limit state design in RF‑CONCRETE Surfaces, there are several options available in the Results navigator for the graphical display of the "provided reinforcement."
However, no rendering of rebars or mesh reinforcement is generated in this case. It is rather a color representation of the result values in [cm²/m] for the longitudinal reinforcement or in [cm²/m²] for the shear reinforcement.
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Wind Simulation & Wind Load Generation
With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures 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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