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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Gallery of impressive RFEM structures…

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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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Dlubal RFEM 5 & RSTAB 8 – Tips for Parametrization

Dlubal RFEM 5 & RSTAB 8 - Tips for Parametrization

Dlubal RFEM 5 & RSTAB 8 – Tips for Parametrization

By Thomas Günthel, Dlubal Software

For recurring elements such as certain structural components or standard parts, it is possible to use the parameterization of a basic model. In the program, the main elements do not represent components but the corresponding node and therefore, they have to be parameterized. For example, a member is not defined by the length, but by the start and end nodes. In this way of modeling, complex formulas may occur especially in the case of three-dimensional structures.

Here are some tips for an efficient and successful parameter model:
1. In order to avoid parametrization of intermediate nodes on lines, you can use the “Node on Line” type. If partial lines between “nodes on line” are required, you can additionally create lines on the line.
2. In the case of circles or arcs consisting of three points, it is necessary to parametrize all nodes individually. You can avoid this by using the “Circle via Center and Radius” type. It can be parameterized via the radius. If more segments on the circle are required, you can also use the “Node on Line” type and thus create partial lines using the “Arc by Three Nodes” type.
3. When using reference nodes, it is possible to move a whole point cloud via only one parameterized node. The points have to be entered solely as reference nodes of the desired node.
4. It is often useful to divide a large structure into individual elements to avoid parametrization of the entire structure. Then, the individual elements are saved as a block and the block parameters are adjusted during import. The advantage is that the parameters are lost after the import and therefore, you can modify the model only by deleting and reimporting the data.
5. Especially when creating many formulas that are the same due to large area, exporting to Excel (with the subsequent import to RFEM/RSTAB) can save a lot of time, because editing of the tables is even easier (formulas can be exported).

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Dlubal RFEM 5 & RSTAB 8 – Extended Definition of Rotated Nodal Loads

Dlubal RFEM 5 & RSTAB 8 - Extended Definition of Rotated Nodal Loads

Dlubal RFEM 5 & RSTAB 8 – Extended Definition of Rotated Nodal Loads

By Walter Fröhlich, Dlubal Software

When defining nodal loads, you can rotate the load using several simple options:
~ Rotation by angle about the global coordinate axes in a specific sequence
~ Direction of a user-defined coordinate system
~ Direction to a specific node
~ Direction of two nodes
~ Direction of a member or a line

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