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Frequently Asked Questions (FAQ)
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In the graphic, this is not possible for reasons of clarity. However, the RF-LAMINATE add-on module allows you to display the stresses point by point. This is deactivated by default because it quickly produces a huge amount of data for large structures.
If you also filter by the stress component that interests you, the output in the table becomes quickly clear and you can evaluate the distribution of stresses at a point via the layers there well.
In the "Calculation" menu, open the interface "RWIND Simulation - Simulate and Generate Wind Loads." Then, delete the results in the "Load Cases" tab with the "Delete RWIND Simulation Results" function.
In a 3D model consisting of three identical floors, I applied a unit load of 1 kN/m² to the top slab to determine the spring stiffness of the supports for 2D modeling of the slabs from normal forces and deformations of the columns. Despite the deactivation of the self-weight of the structure, there is a redistribution of the column normal forces by storey. Is it possible to deactivate this effect?
This effect is most likely caused by the bending, torsional and shear stiffness of the slabs and can be avoided by modifying the stiffnesses mentioned.
To modify stiffnesses, go to the "Modify Stiffness" tab in the "Edit Surface" dialog box, see Figure.
AnswerAfter creating the two nodes, for which you want to display the displacement, you should ensure that they belong to the surface.If these two nodes are not connected to a line, it is necessary to integrate them in the mesh to be considered in the calculation with finite elements.To integrate these objects that are not used in the mesh, click the Calculate menu → FE Mesh Settings, which opens the FE Mesh dialog box. In this dialog box, select the Integrate unutilized objects into surfaces check box.After the calculation, you can see the displacement of these nodes in Table 4.2 Nodes - Displacements.
First, the "Connect Lines/Members" function is recommended to separate the members from each other at intermediate nodes. They are still connected.
Then, activate "Nodal Displacements" and "Extremes" under "Results" in the Display navigator, see the figure.
In addition, the deformation values can be read in the table window.
The corresponding load cases and load combinations can be displayed in result tables. For this, select the "Corresponding Load Cases" option in the "Table Filter" dialog box (Figure 01). To open the dialog box, use the menu Table → View → Result Filter or the corresponding button in the table toolbar (Figure 01).
In RSTAB, the corresponding load cases/combinations can be displayed in the following tables:
- 4.1 Members - Internal Forces
- 4.2 Sets of Members - Internal Forces
- 4.3 Cross-Section - Internal Forces
- 4.4 Nodes - Support Forces
In RFEM, the corresponding load cases/combinations can be displayed in the following tables:
- 4.1 Nodes - Support Forces
- 4.3 Lines - Support Forces
- 4.4 Members - Local Deformations
- 4.5 Members - Global Deformations
- 4.6 Members - Internal Forces
- 4.7 Members - Contact Forces
- 4.11 Sets of Members - Internal Forces
- 4.12 Cross-Sections - Internal Forces
AnswerThis is caused by the active partial safety factor γM. After you deactivate it, the results are identical.
To display the nodal displacements graphically, the setting "Nodal Displacement" in the Display Tab under Results - Deformations - Members - Nodal Displacements must be activated.Under the Results tab, turn on Global Deformations. Then the nodes can then be highlighted and isolated by using the "Views By Selected Objects" for a better view of the nodes and displacements.
The value scale can be adjusted individually as follows:
- Double-click the color scale.
- Enter one or more desired values.
- Click "Fill."
- Save and confirm, see the figure.
AnswerIn most cases, a resulting shear force or a shear force applied over the height is of interest, and not the actual surface distribution. For this, there are two tools for displaying the forces. This is shown in the following example of a shear force. Furthermore, the procedure is shown in the video.
Evaluation by Section
By using a section, the distribution can be displayed graphically as a result diagram. In order to read out the shear force for the example shown in Figure 01, the shear flow nxy is required. This result diagram can then be further evaluated in the result diagram, for example, to determine the resulting shear force. Furthermore, the resultant can also be displayed graphically. In order to neglect the influence of supports, it is not recommended to create the section directly on the ground line of the surface. Basically, the following applies: The finer is the FE mesh, the more accurate are the results.
Evaluation by Result Beam
Another option is to use a result beam that integrates the surface internal forces and displays them as member internal forces. If you are only interested in the internal forces, you can select any cross-section because the result beam does not bring any further stiffness into the structural system. The advantage of the result beam is that the assigned cross-section can also be designed in the add-on modules.
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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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