Designed with Dlubal Software: Metro Station in Naples, Italy

Designed with Dlubal Software: Metro Station in Naples, Italy

Designed with Dlubal Software: Metro Station in Naples, Italy

By Marine Boulanger, Dlubal Software

The railway station forecourt, six hectares in size, with parks, gardens and fountains, was restructured between 2005 and 2013 along with the eponymous metro station below.

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Dlubal RFEM 5 & RSTAB 8 – Login to New Extranet

Dlubal RFEM 5 & RSTAB 8 - Login to New Extranet

Dlubal RFEM 5 & RSTAB 8 – Login to New Extranet

By René Flori, Dlubal Software

The new Dlubal Software website provides a new extranet for customers and interested people. Customers who already have access to the extranet can login with their e-mail address used for the registration and their password. Previously used login names cannot be used anymore. In case you have forgotten your password or e-mail address, please contact our customer support.

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Dlubal RFEM 5 & RSTAB 8 – Move/Edit Background Layers

Dlubal RFEM 5 & RSTAB 8 - Move/Edit Background Layers

Dlubal RFEM 5 & RSTAB 8 – Move/Edit Background Layers

By Thomas Günthel, Dlubal Software

In RFEM and RSTAB, it is possible to import DXF files as background layers. They can have one to three dimensions. For this, you can use DXF files from other programs as well as the DXF files exported from RFEM or RSTAB.

Background layers help you save previously marked objects in the background and use the snap function on these elements. Moreover, you can then move, rotate, etc. these objects, for example members or nodes. To open this menu, right-click the respective background layer in the project navigator and select “Guide Objects” -> “Background Layers”.

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Dlubal RFEM 5 & RSTAB 8 – Applying Changes of Line Grid in Model

Dlubal RFEM 5 & RSTAB 8 - Applying Changes of Line Grid in Model

Dlubal RFEM 5 & RSTAB 8 – Applying Changes of Line Grid in Model

By Markus Baumgärtel, Dlubal Software

Arranging a model into an axis can provide better visibility. In addition, the line grid can allow you to quickly apply changes in the model.

Select the “Apply changes in model” check box to adjust the model nodes lying within the grid nodes of the line grid according to the input parameters. The changes have no impact on all the other nodes lying outside these grid points.

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Dlubal RFEM 5 & RSTAB 8 – Shortcut Menu “Hide” / “Cancel Hiding of”

Dlubal RFEM 5 & RSTAB 8 - Shortcut Menu "Hide" / "Cancel Hiding of"

Dlubal RFEM 5 & RSTAB 8 – Shortcut Menu “Hide” / “Cancel Hiding of”

By Sonja von Bloh, Dlubal Software

In addition to the options of the Project Navigator – Display, you can modify the visibility of structures (members, surfaces, etc.) and guide objects (dimensions, comments, guidelines, etc.) in the menu and toolbar using shortcut menus.

First, select the objects to be hidden in the work window. Then, select the corresponding hiding option in the shortcut menu. You can cancel the visibility of structures and guide objects separately. For this, select the corresponding option in the shortcut menu.

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Dlubal RFEM 5 & RSTAB 8 – Standards for Classification and Combinations

Dlubal RFEM 5 & RSTAB 8 - Standards for Classification and Combinations

Dlubal RFEM 5 & RSTAB 8 – Standards for Classification and Combinations

By Robert Vogl, Dlubal Software

In RFEM and RSTAB, it is possible to combine load cases with the correct partial safety factors automatically.

The current standards are preset in the list by default. If you need an “old” standard, use the [Filter] button to show the previous versions.

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Dlubal RFEM 5 & RSTAB 8 – Critical Load Factor of Tapered Steel Frame 3: FE Model and RF-STABILITY

Dlubal RFEM 5 & RSTAB 8 - Critical Load Factor of Tapered Steel Frame 3: FE Model and RF-STABILITY

Dlubal RFEM 5 & RSTAB 8 – Critical Load Factor of Tapered Steel Frame 3: FE Model and RF-STABILITY

By Frank Sonntag, Dlubal Software

The following post verifies the determined mode shapes or critical load factors of the previous beam structures using an FE model in RFEM (surface elements) and RF-STABILITY.

You can quickly create such model in RFEM due to effective modeling tools (“Generate Surfaces from Members” here) and the well-arranged graphical user interface.

In RF-STABILITY, critical load factors and the corresponding stability modes can be determined. For this, you can use linear eigenvalue solver or nonlinear stability analysis.

In our example, the linear eigenvalue solver (Lanczos method) determines the critical load factor of 2.26, which corresponds to the previous models of the structure.

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Dlubal RFEM 5 & RSTAB 8 – Verification Example: Equivalent Loads

Dlubal RFEM 5 & RSTAB 8 - Verification Example: Equivalent Loads

Dlubal RFEM 5 & RSTAB 8 – Verification Example: Equivalent Loads

By Gerlind Schubert, Dlubal Software

On the Dlubal website there is a new verification example about equivalent loads available (Example 105).

In this example the natural frequencies, the effective modal masses, and the equivalent loads of a cantilver beam with five mass points are analytically calculated. The equivalent loads that are determined with RF-/DYNAM Pro – Equivalent Loads are compared with this analytical solution.

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Dlubal RFEM 5 & RSTAB 8 – Quick Info About Elements

Dlubal RFEM 5 & RSTAB 8 - Quick Info About Elements

Dlubal RFEM 5 & RSTAB 8 – Quick Info About Elements

By Gerhard Rehm, Dlubal Software

You may already know the “Center of Gravity and Info” function, which can be accessed by using the shortcut menu of any element. If you want to display this information on several elements consecutively, you have to close the dialog box and open the shortcut menu of the next element over and over again.

For this, it is easier to use the “Info About Object” function which is available in the toolbar (see the picture). Once you start the function, the corresponding dialog box displays the information of any element as the cursor runs over it. It does not matter whether it is a member, a surface, or a solid; the program detects the element type automatically and displays the respective information.

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Dlubal RFEM 5 – Form-Finding Stage in RF-FORM-FINDING

Dlubal RFEM 5 - Form-Finding Stage in RF-FORM-FINDING

Dlubal RFEM 5 – Form-Finding Stage in RF-FORM-FINDING

By Andreas Niemeier, Dlubal Software

During the form-finding process, the elasticity of a substructure is also taken into account when searching for the equilibrium state. You can also consider large deflections of supporting trusses or pure bending deformation of the edge beams when determining the membrane shape.

If no additional deflection of membrane supports appears, the respective edges can be defined with a support including the nonlinearity of “Form-finding stage only”. Thus, these supports are effective in the form-finding process only. In this step, all relevant points and lines are supported in the selected direction. These settings do not apply to any further calculations using the new membrane shape.

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