In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
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The temperature loads as surface loads on general glass cross-sections cannot be considered by modeling them as solid elements in the program. With the default settings, the glass pane is modeled by using 3D solid elements.
However, the 2D calculation allows for modeling temperature loads as surface loads. You can set this in the details of the layer structure, so that the 2D calculation (plate theory) is performed. In this case, it is also possible to consider the shear coupling between the layers, if necessary.
Further details on calculating and using laminated glass can be found in the technical article "Calculation and Use of Laminated Glass."
After the successful calculation, you obtain the results for the respective layer structure. Figure 04 shows the results as an example of a layer structure without shear coupling.
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).
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
The stiffness modifications can be controlled separately for the following elements:
The first option "Materials" is only activated for load combinations by default (see Figure 02) as there is the second-order analysis preset for this. If activating the function, the stiffness of all elements is reduced by the partial safety factor of the material (see Figure 03). This is especially important for timber construction in Europe. If the automatic load combination has been selected for the standard EN 1990 + EN 1995, SIA 260 + SIA 265, or DIN 1055‑100 + DIN 18008, the default settings are different. Provided that the partial safety factor of the material is defined as 1.0, it does not matter if the function is activated or not.
This option allows you to control the multiplication factors of the individual cross-sections. In the "Modify"tab of the "Edit Cross-Section" dialog box, you can adjust the moments of inertia as well as the cross-sectional areas. This affects the stiffness of the cross-sections.
When editing a member, the "Modify Stiffness" dialog tab is available. There are various definition types (see Figure 05). The "Multiplication Factors" option allows you to modify the stiffness of the individual members in a similar way as the cross-sections.
For the surfaces of the "Standard" and "Without Tension" type, the stiffness of the surface can be adjusted in the "Modify Stiffness" tab of the "Edit Surface" dialog box. There, it is possible to modify the stiffness matrix elements with a factor (as in the case of orthotropic surfaces).
Further Options for Stiffness Modification
Furthermore, you can select the option in the calculation parameters to specifically adjust the stiffness of other elements (see Figure 07). If you select the "Modify stiffness" option, a new tab appears (see Figure 08). In addition to the member and surface stiffnesses, it is also possible to individually adjust the stiffnesses of supports and releases.
Interactions of Individual Factors
If several factors have been defined for an element (for example, cross-section and member), they are multiplied by each other. For the example shown in Figure 09:
Global Control of Stiffness Modification
In the global calculation parameters (see Figure 10), it is possible to deactivate all options mentioned above at once. The local settings in the calculation parameters of the load cases or the load combinations are ignored in this case.
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).
AnswerBy using the FE mesh refinement, the program allows you to create a mapped FE mesh. The automatic FE mesh generator can thus be controlled to a certain extent. However, a specified mesh geometry cannot be set.
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.
AnswerThe online service "Geo-Zone Tool: Snow, Wind, and Seismic Zone Maps" graphically displays structural loads according to the relevant standards on Google Maps and shows the site-specific structural loads for an explicit location on the map.Based on the national references of the standards used, the online service provides the information about each load type described in the standard. If the standard specifies no data for the specific load type, the online service does not provide any further information for this load type (for example, snow loads in an African desert).If there is no particular structural load standard provided in the selection boxes of the online service, this standard is not yet included. Our team strives to expand the online service for all relevant countries around the world and to maintain the tool. The implementation priorities are geared to suit the needs of users and the mandatory maintenance and upgrade works.
Yes, you can define the required composition of the glass pane in Window '1.2 Layers'. In order to define the insulating glass, it is necessary to assign at least one glass layer to the composition. Then, you receive an additional option for the gas layer.
After entering the gas layer, additional tabs appear where you can enter further specific data for the design.
Yes, it does. Since the determination of the allowable limit stress for various glass units applies different GammaM factor according to DIN 18008, this is also included in our material library. However, the consequence if this is that by activating this option, the stiffness of the structural system is reduced by this factor.
Especially in the case of the analysis of solid loads (climatic loads), the reduced stiffness of the system has also effect on the calculated stresses and deformations.
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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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