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Frequently Asked Questions (FAQ)
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AnswerWhen defining an imperfection, there are four options available for activating the precamber.
The attached example video shows that the limit slenderness is not exceeded for the middle column. No imperfection is applied. The bending moment Mz is zero.
The precamber is always taken into account.
- EN 1993-1-1 (5.8)
The precamber is only taken into account if the slenderness ratio is greater than in Formula (5.8) of the standard EN 1993‑1‑1 (see Figure 01).
- DIN 18800 (207)
For the calculations of existing buildings, this option according to the withdrawn standard DIN 18800 was left in the program.
Here, you can specify a value for the member coefficient ε0. The member coefficient is determined according to the formula in Figure 02.
The project manager is divided into several areas. On the left, there is the project navigator. The upper middle area displays either the models assigned to a project (tab "RFEM," "RSTAB," and so on) or an overview of the projects (tab "Projects").
When displaying the project overview, it is not possible to create a new RFEM or RSTAB model. To do this, switch to the "RFEM" or "RSTAB" tab. The video shows a short instruction.
AnswerThe resistance of the web to shear loads is verified during the design. If there are no stiffeners arranged in the area of the supports, a minimum wheel distance must be satisfied for the start and end supports according to EN 1993‑1‑5, Section 5.3(2)(a). The program provides two solution approaches.
a) A stiffener is arranged for the start and end support.
b) In Window 1.4, buffers are arranged that ensure the minimum distance of the crane wheel from the support.
AnswerFor a pure compression member, RF-ALUMINUM performs the design according to Chapter 188.8.131.52 of the standard EN 1999-1-1. The boundary conditions, imperfection coefficients and reduction coefficients used can be found in the module in the lower detail table.
Simply use the deformations for the result evaluation. Since the deformations are very small, increase the number of decimal places for the display of the deformation in the first step.
If you display the deformation in global Y for the wall pillar and increase the display factor, you can clearly see how the wall is bent. The support reaction counteracts as restraint of this deformation.
If you define a line support directly on the slab edge, the flexibility of the wall surface is not applicable.
This task can be easily solved with RFEM:
- First, create your structure with surfaces of constant thickness.
- Now, double-click the surface to which you want to assign the variable thickness.
- In the "Thickness" section of the dialog box, select the "Variable..." option and then click the [Edit] button.
- In the "New Variable Thickness" dialog box, define the variable thickness by using three edge nodes of the surface.
AnswerOpen Block Manager, select and right click the block to be protected. Here, select "Set as Read Only." If you want to unlock the block again, this works in the same way.
In this case, you have defined an RF‑DYNAM Pro case and the results are not available. There are two ways to solve the problem:
- Open the Calculation menu and select "Calculate All."
- Select the RF‑DYNAM Pro add-on module and only calculate the results of it.
Now, you can perform the design again in RF‑STEEL EC3. The RC previously shown in red can now be found under "To Design."
AnswerWith the release of the program version RFEM 5.23.01, there is a new option "Simulate and Generate Wind Load" available in the settings of RWIND Simulation. This allows you to export 3ds files inserted in RFEM as a terrain model or a surrounding model to RWIND Simulation. It is also possible to consider an IFC or STEP file imported as CAD/BIM model in RWIND Simulation.
AnswerIf you want to consider the load cases again, please perform a new RWIND Simulation calculation. If you want to perform the calculation of the existing combinations, please remove the RWIND Simulation load cases from the Wind action before deleting the FE mesh, then the combinations are created again and it is possible to perform the calculation.
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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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