Dlubal RFEM 5 & RSTAB 8 – Using Edge Members in Wind Load Generator

Dlubal RFEM 5 & RSTAB 8 - Using Edge Members in Wind Load Generator

Dlubal RFEM 5 & RSTAB 8 – Using Edge Members in Wind Load Generator

By Gerhard Rehm, Dlubal Software

When using the wind load generator for vertical walls with the roof, it may be necessary to load the edge members on eaves or on a gable only with wind loads of the roof. For structural reasons, the horizontal wind loads should apply to the vertical walls by the facade. In previous versions, it was necessary to apply the wind loads separately to the walls and the roof with the corresponding generators and exclude the unwanted members.

Now it is possible to directly consider the effect mentioned above using the combined wall/roof generator. For this, select the option “Do not load members common for roof and wall with wall wind loads” in the Settings dialog box. Thus, the loads of vertical walls do not apply to the edge members, but they are distributed on supports as shown in the figure. The edge member is loaded only by a part of the roof.

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New Office of Dlubal Software in Bologna, Italy

New Office of Dlubal Software in Bologna, Italy

New Office of Dlubal Software in Bologna, Italy

By Fabio Borriello, Dlubal Software

Dlubal Software, currently with branch offices in Tiefenbach and Leipzig (Germany), Prague (Czech Republic), Katowice (Poland) as well as Paris (France) and working together worldwide with more than 20 resellers, continues its course of expansion and strengthens its presence in international markets by opening a new branch office in Bologna (Italy).

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Dlubal RFEM 5 & RSTAB 8 – Select Function in New Reinforcement Graphic of RF-/CONCRETE (Members)

Dlubal RFEM 5 & RSTAB 8 - Select Function in New Reinforcement Graphic of RF-/CONCRETE (Members)

Dlubal RFEM 5 & RSTAB 8 – Select Function in New Reinforcement Graphic of RF-/CONCRETE (Members)

By Alexander Meierhofer, Dlubal Software

With the introduction of OSG graphics for the representation of design reinforcement in RF-/CONCRETE (Members), it is also possible to select the reinforcement position directly in the graphic. Right-click the mouse to open the context menu where you can edit, copy, or delete the selected reinforcement position.

In the main table, the selected reinforcement position is synchronized with the selected item.

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Designed with Dlubal Software: Art Project “Solhjul” in Give, Denmark

Designed with Dlubal Software: Art Project "Solhjul" in Give, Denmark

Designed with Dlubal Software: Art Project “Solhjul” in Give, Denmark

By Andreas Hörold, Dlubal Software

In May 2015, the art project “Solhjul” (in English: sun wheel) by the artist Bo Karberg was officially opened. The wheel, 12 m high, is located on the center island of a traffic circle in Give (Denmark). It is now the new symbol of the town.

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Dlubal RFEM 5 & RSTAB 8 – Displaying Results on Couplings

Dlubal RFEM 5 & RSTAB 8 - Displaying Results on Couplings

Dlubal RFEM 5 & RSTAB 8 – Displaying Results on Couplings

By Sandy Matula, Dlubal Software

In order to display the internal forces of rigid members, it is necessary to select the corresponding option under “Results” -> “Members” -> “Results on Couplings” in the Display navigator.

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Dlubal RFEM 5 – Defining Result Sections

Dlubal RFEM 5 - Defining Result Sections

Dlubal RFEM 5 – Defining Result Sections

By Ulrich Lex, Dlubal Software

For evaluating results on surfaces, RFEM provides the option to define sections. Basically, there are two different types of sections available. On the one hand, you can create a temporary section, which displays the result diagrams of the selected section edge only once. On the other hand, you can define a section in the dialog box, which is then applied as a separate object in RFEM, providing the result display at any time. The result display of defined sections is performed graphically in RFEM, but it can also be displayed separately as a dialog box and added into the printout report.

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Dlubal RFEM 5 & RSTAB 8 – Result Filter of Tables in Printout Report Using Detailed Settings

Dlubal RFEM 5 & RSTAB 8 - Result Filter of Tables in Printout Report Using Detailed Settings

Dlubal RFEM 5 & RSTAB 8 – Result Filter of Tables in Printout Report Using Detailed Settings

By Adrian Langhammer, Dlubal Software

In order to reduce the number of pages in a printout report or to get shorter and clearer result tables, you can use filters for the printout report tables using individual detailed settings.

For example, if the governing user-defined internal forces (such as N, My, Vz) are displayed for each cross-section in a result combination, you can select it as follows (see figure):
~ Open the selection for RFEM
~ Select the RC Results tab
~ Open the details of Table 4.12 by clicking […] at the end of the line
~ Specify the filter

The detail options are available for the tables with three points displayed at the end of the line in the overview.

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Dlubal RFEM 5 – Calculation of Timber-Concrete Composite Structures in RF-LAMINATE

Dlubal RFEM 5 - Calculation of Timber-Concrete Composite Structures in RF-LAMINATE

Dlubal RFEM 5 – Calculation of Timber-Concrete Composite Structures in RF-LAMINATE

By Bastian Kuhn, Dlubal Software

RF-LAMINATE allows free definition of materials. Thus, you can combine any compositions of different material. The combination of concrete and timber is possible as well. However, the rigid composite must be provided when defining such a composition. In RF-LAMINATE, you can consider full shear coupling or no shear coupling at all.

In the figure, a calculation with flexible volume models was performed. The stiffness composition is the same as in RF-LAMINATE. However, the solid model shows greater deformation.

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Dlubal RFEM 5 – Displaying Result Values of RF-CONCRETE Surfaces

Dlubal RFEM 5 - Displaying Result Values of RF-CONCRETE Surfaces

Dlubal RFEM 5 – Displaying Result Values of RF-CONCRETE Surfaces

By Paul Kieloch, Dlubal Software

It is possible to document the results of RF-CONCRETE Surfaces graphically in the printout report. For this, the setting of “Values on Surfaces” is often selected in the Results navigator of RF-CONCRETE Surfaces. There is a text bubble including a result value displayed. Depending on the settings in the Results navigator, it can be displayed either on the surface grid points or manually defined points, or in FE mesh points.

As an alternative to the text bubble, there is the “Transparent” option at the end of the Result navigator. If selected, the text bubble is replaced by a point at the location of the resulting value, showing the result values transparently. The size and color of the point can be set in the display properties of RFEM. For this, click “Display Properties” -> “Colors” category -> “Other” -> “Text Bubbles”. You can specify the size of the point by the “Line thickness” entry. There is the value of 3 set for the line thickness and the color red by default.

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Dlubal RFEM 5 & RSTAB 8 – Specifics of Using Tension Members

Dlubal RFEM 5 & RSTAB 8 - Specifics of Using Tension Members

Dlubal RFEM 5 & RSTAB 8 – Specifics of Using Tension Members

By Sebastian Hawranke, Dlubal Software

Shoring braces usually obtain the “tension member” type. There are a few specifics to note because in the case of uniform, symmetrical structures and solely vertical loads, an error message often appears as follows: “The model is unstable in Node 20 relocatable in the Y-direction.”

The reason is that the supports and beams are compressed. In this context, all shoring braces absorb pressure and fails at the same time, which eventually leads to the instability of the structure. You can easily retrace this by converting tension members into trusses (only N) and calculating them according to the linear static analysis.

The “Failing members to be removed individually during successive iteration” option under the “Global Calculation Parameters” tab can prevent the complete failure of tension members. In most cases, this is the solution.

Alternatively, there is the second option “Assign reduced stiffness to failing members”. For this, minor compression forces may occur in the tension members.

In addition, applying an initial prestress can be helpful. It is consistent with general building practice because many braces can be readjusted. Determination of the appropriate prestress is an iterative process. However, it should not exceed five percent of the ultimate tension resistance of the bracing.

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