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Frequently Asked Questions (FAQ)
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Yes, it is possible.
When modeling a spherically curved glass pane, make sure that the surface consists of four boundary lines only.
In RF‑GLASS, it is necessary to deactivate the "Activate layered mesh for solids" option for double-curved or spherical glass panes.
More information about curved surfaces in RF‑GLASS can be found in another FAQ (see the link below).
AnswerWhen modeling a glass pane, especially an insulating glass pane, it is necessary in RFEM to pay special attention to the boundary lines that must consist of four lines only.If possible, you should avoid the division of lines since the calculation cannot be performed anymore. In that case, the corresponding warning message will be displayed before the calculation.If special intermediate nodes are required on the line, make sure that they do not divide the original line when creating them.However, if the line is divided anyhow the structure can be restored by using the "Delete Node and Merge Joined Members" command.In exceptional cases, you can deactivate using the layered mesh in the details of the composition. This option has been specifically implemented for double-curved panes.
In RF‑GLASS, there are two different types of calculations. On the one hand, there is the "2D" calculation. In this case, a glass structure is displayed as a surface element. When considering the shear coupling, the program determines an equivalent cross-section by using the laminate theory On the other hand, there is the "3D" calculation. In this case, the composition is modeled as a solid element in the calculation, and thus the effectiveness of stiffnesses between the foil and glass is determined exactly when considering the coupling.
Further information about the calculation methods can be found in the RF‑GLASS manual, Chapter 2.
AnswerGlass structures can be analyzed in RFEM with the RF‑GLASS add-on module. It is possible to carry out the calculation and design on the entire model or separately.
An extensive material library contains many of the commercially available glass types, layers, and gases.
Define nodes or lines for the support of glass surfaces or model solids. The results include stresses in surfaces and solids, among others.
For the glass design, you need RFEM as the basis. Also, RFEM provides a variety of options for the calculation and design of solid, steel or timber structures.
Main Program RFEM
Calculation of stresses and deformations of arbitrary shaped and also curved glass surfaces.
- DIN 18008: 2010-12
- TRLV: 2006-08
AnswerIn the case of a layered FE mesh, the same requirements apply as for a contact solid (see the links below this FAQ). If the requirements are not met, the layered FE mesh must be deactivated in the details of the composition (see Figure 02).
AnswerYes, it is possible to create a new standard where you can modify all values.This user-defined standard will be saved so you can use it again at any time.
AnswerThe RF-/JOINTS add-on module is divided into several joint groups. For this, see the following FAQ.Therefore, there is no straightforward answer to the special aspects of the design as in this FAQ.In contrast to the RF‑/TIMBER Pro add-on module described in the mentioned FAQ, however, it is obvious that the RF‑/JOINTS add-on modules cannot design EC2, even if manually changing the LDC, for example in the RF‑/JOINTS Timber - Steel to Timber add-on module (see Figure 01).Furthermore, this also applies to the add‑on modules RF‑GLASS and RF‑/CONCRETE NL.The reason for this is that there are stiffnesses exported in the program in the case of some joint groups of the RF‑/JOINTS add‑on module. For nonlinear calculations, the superposition with result combinations is not allowed. In the case of the second result combination mentioned above, there is the special feature that the superposition is no longer conservative, even in the case of simple structures. The design cannot be also performed correctly by manually changing the LDC.Nevertheless, if a result combination should be superimposed with constant and alternative additive, it is necessary to split EC2 in the attached file into load combinations as follows.
- RC2*=CO1 or CO2
AnswerIf there is an insulated glass unit selected for the design in RF‑GLASS, the method of the large deformation analysis is set by default. Based on the existing gas volume in the space between glass panes, this method of analysis is also required and cannot be changed.
AnswerYou can usually set the standard and the National Annex in the top right corner of an add‑on module (see Figure 01). In most cases, it is also possible to display the factors of the National Annex and edit them, if necessary (see Figure 02).
AnswerLoads from the whole structure are automatically considered for the design in RF‑GLASS if you select the global calculation type and the corresponding load case.In the case of the 'local' calculation type, the structural system is considered separately and thus the loads directly acting on the surface are only taken into account.Therefore, it is necessary to manually enter the loads from the supporting system in the case of this calculation type.
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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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