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Frequently Asked Questions (FAQ)
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The prerequisite for both generators is the use of the 3D model type. For a 2D model type, the program does not have the corresponding geometrical parameters.
The model type is defined within the General Data of the model. The corresponding dialog box can be opened in the Data navigator by right-clicking "Model Data" and then using the shortcut menu option "General Data" (see Figure 1).
If changing the model type, it may be necessary to adjust the modelling (supports, joints).
AnswerRSTAB is a 3D structural frame analysis program where the design of 2D and 3D frameworks is possible. The efficient RSTAB solver allows for linear and nonlinear calculations of internal forces, deformations, and support reactions.
With RFEM, you extend the member design by plates, shells and solids according to the Finite Element Method. These elements can be combined arbitrarily in a structure. RFEM contains almost all functions from RSTAB; that is why also pure frameworks can be designed with it.
The user interface and the handling of RSTAB and RFEM are almost identical, but RFEM offers more functions due to the greater scope of the program. The import of structure and load date from RSTAB to RFEM and vice versa is possible as long as the objects are supported by both programs.
Various add-on modules are available for structural design in RSTAB and RFEM considering both material and standard-specific requirements. Thanks to the modular software concept, it is possible to put together a program package which is adapted to the individual needs. It is possible to upgrade the program at any time.
AnswerIf a rolled cross-section with the desired dimensions is not available in the cross-section library, it can be created manually. To do so, select the cross-section you wish to change and click the "Parametric Input" button. A dialog box opens where you can enter the desired data (see Figure 1).
AnswerYes, support forces of single surfaces can be displayed in the table "4.21 Surfaces - Contact Stresses" available in the RFEM table window. This table can be opened by right-clicking one of the tabs of the "4.xx - Results" table (see Figure 1). In addition to the contact stresses, you can also see the corresponding support forces (see Figure 2).
AnswerYou find this setting in the "General Data" of the model.You can distinguish between the model types "3D", "2D - XY", "2D - XZ" and "2D - XY".If you want to enter a floor as a 2D model, and the axial forces within the slab should not be taken into account, set the model type to "2D - XY". If you want to enter a wall, set "2D - XZ".Find more information in the RFEM manual, chapter 12.2.1 General - Type of Model.
AnswerFor this, it is necessary to select "DIN" as National Annex in "Window 1.1 General Data" first. Then, you can open [Details...]. Here you can find the design for limiting the gaping joint under the "Highly eccentric loading in the core" option. For this, see Figure 01.
AnswerThe title block of the printout report is created using the authorization file, which was used in the initial installation of our programs.
A subsequent change in the authorization file does not necessarily change all report headers immediately.
For the changed title block to be created as default in the authorization file, the "old" one has to be removed first.
To do so, please delete the file "DlubalProtocolConfigNew.cfg" in the following (default) directory:
While deleting the file, our applications must be closed!
AnswerYes, this is done by creating a user-defined cross-section in the cross-section library.
AnswerRFEM provides two ways to divide surfaces:1) Split SurfaceThe requirements to split a surface evenly are that it has four sides and is convex; in other words, none of the four internal angles may be greater than 180°.This function is accessed by right-clicking the surface and selecting "Split Surface". In the corresponding "Split Surface" dialog box, the number of divisions in each direction and the individual relative distances are entered (see Figure 1).2) Divide SurfaceIf any lines are drawn within the surface plane, they may be used to divide the surface (see Figure 2). First you have to check, whether the division lines are integrated in the surface. This is normally the case due to the automatic object detection (see Figure 3). Afterwards, right-click on the surface and select "Divide Surface" to use the desired function (see Figure 4).
Since program version 5.19, you can directly consider the eccentric load introduction in RFEM by using the member loads (see Figure 1). The eccentric load introduction can be used for the load type "Force".
As an alternative (e.g. in RSTAB), you can also define a coupling by means of a rigid member to consider the external concentrated loads that act eccentrically on the member. The rigid member is to be connected perpendicularly to the corresponding member. The length of the rigid member corresponds to the amount of the eccentricity (see Figure 2).
Alternatively, you can enter the torsional moment due to the eccentric load introduction as external loading (also for eccentric member loads). Thus, the eccentric action would be taken into account and the definition of a rigid member would not be necessary (see Figure 3).
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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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