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Frequently Asked Questions (FAQ)
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A load-deformation diagram for any node of a model (Figure 1) can be defined as a user-defined calculation diagram within the calculation parameters (button or menu 'Calculation' → 'Calculation Parameters') and displayed with the corresponding results:
- To set the desired load increments within the global calculation parameters, see Figure 2
- Definition of a user-defined calculation diagram within the 'Calculation Diagrams' tab: For the selection of the load case, the corresponding node, and the result types of the horizontal and vertical axis see Figure 3
AnswerA section can run through a complete structure and display results on surfaces that are intersected. It is important to define which surfaces are intended for displaying results of the section. In Figure 01, a section was defined in such a way that all intersected surfaces (default setting) are displayed. In this case, both walls will be intersected and the results will be attached to the result diagram (see also Figure 02).If you want to display the section only on certain surfaces, define the required surfaces in the 'Edit Section' dialog box (see Figure 03). Then, the section is displayed in the result diagram as requested (see Figure 04).
The FE analysis determines the results for each FE mesh node. Usually, a continuous distribution of the internal force or deformation is preferable for the graphic. For this purpose, it is necessary to smooth the results e.g. by interpolation. However, the question can not be answered universally, because it has to be decided from model to model. Basically, RFEM distinguishes between the following five options:
There is already an interesting technical article about this topic.
- Constant on elements
constant distribution in the element
Interpolation in element based on results in special points
- Continuous within surfaces
Mean value mode at the node within the defined surfaces, followed by interpolation via the element
- Continuous total
All results are averaged on the node (independent of the defined surfaces); subsequently, the interpolation takes place via the element
- Continously by groups
It is also possible to smooth results by groups. RFEM provides Generated groups with similar material properties. You can create user-defined groups of surfaces or solids by using the navigator shortcut menu (right-click User Groups).
- Constant on elements
You can access the results of the individual load increments by activating the "Save the Results of Load Increments" option in the calculation parameters of the load case or load combination (see Figure 1).
By using the "Calculation diagrams" window in the calculation parameters, it is possible to additionally evaluate individual results for selected elements (see Figure 2). It is also possible to easily create several calculation diagrams.
AnswerIn case of the result values are displayed in red, it refers to an error message.The defined thickness z is then not sufficient. The standard specifies that the thickness must be calculated up to the value where sigma_Z is ≦ 0.2* sigma_ü. In the graphic, 0.2 * sigma_ü is displayed as a gray line, sigma_Z as red.The layer structure should have such a thickness that both lines intersect.In Figure 1, the two lines do not intersect, so that the values are displayed in red and a sufficient thickness must be defined.
AnswerThere are several possibilities to evaluate the results of line hinges:
- Graphical evaluation of results: When opening the menu item “Releases” in the Result Navigator, you can display various forces and deformations of the line releases in the graphic.
- Tabular output of results: The tables “4.45 Line Hinges - Deformations” and “4.46 Line Hinges - Forces” are available for the table evaluation.
- Evaluation by Result Diagrams: Use the shortcut menu to view the result diagram of line hinges.
AnswerTo display the result distribution of a line release or a line hinge, right-click the relevant line release or line hinge. Then, select "Result Diagrams" in the shortcut menu (see Figure 1).
AnswerThe modulus of elasticity is calculated for each step of the defined diagram according hooks law ε=σ/E.The modulus of elasticity is displayed on the right side of the diagram (picture 1).
AnswerThe diagrams are stored in a configuration file. This file is located in the file path C: \ ProgramData \ Dlubal \ Global \ General Data \ and is called NonLinWorkDiagMembRelease.cfg. Before the configuration file is copied, the RFEM / RSTAB file has to be saved and RFEM / RSTAB has to be closed.
AnswerIn this case, you have the option to print the image in the timeline diagram directly into the printout report. Here you proceed as described in the picture.
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