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Frequently Asked Questions (FAQ)
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AnswerThe result display with result values on surfaces is very helpful for this.It is already preset that only extreme values are displayed. In addition, you can specify in the Results navigator whether the extreme values of the entire model, all surfaces or solids, or all local peak values should be displayed.
AnswerUnfortunately, the add-on module RF-CONCRETE Surfaces for RFEM 5 is not designed for the design of sandwich elements. Therefore, there are no essential designs for structural components like For example, the shear joint check. Regardless of whether it is a wall or a slab.The bending design, and in particular the check of the shear force resistance, is designed for constant cross-sections.You can model the sandwich elements as surfaces with a constant thickness and perform the design in RF-CONCRETE Surfaces. If necessary Additionally required designs would have to be performed separately.
AnswerIt is often the case that one or more surfaces of the generated volume have double lines. In this case, the peripheral surfaces of the solid are not closed and the generation must be stopped. To find these lines quickly, the program displays a corresponding message.Solution:You can quickly find double lines with the function "Tools → Model Check → Overlapped Lines". In this tool, you can also display the line pairs as an Excel list or create partial views (see highlighted buttons in Figure 02).However, it is often the case that the lines can not be deleted easily because they are assigned to different objects. If you delete one of the lines, z. For example, a surface is deleted as well. It is therefore recommended to check for all structural components if the lines can be deleted and if necessary change the boundary lines.
AnswerIn most cases, these new elements only have to be added in the relevant add-on module. In Figure 1, you can see that the tick for "all" is not set and therefore new elements have to be added manually.
AnswerFirst, select the type of stiffness modification to be carried out in the Edit dialog box of the respective surface in the "Modify Stiffness" tab. For example, as shown in Figure 01, by using the "multiplication factors".Multiplication factors can be specified for the different stiffness components (for example, membrane stiffness).Whether the factors or the set stiffness modification are applied in the individual load cases or load combinations is controlled by the calculation parameters. Now, this means that the modification is taken into account as soon as the check box shown in Figure 02 has been set. When you remove the check box, the modifications will not be considered for the surfaces.Thus, it is possible to control the stiffness modification by load case or load combination.
AnswerTo find this function, right-click Extrude Line. In the detail settings, you can select it locally.This video feature is explained in the attached video.
AnswerThe main reason for this is the FE mesh size as well as the different smoothing of the results. The results should be aligned with each other with an increasingly finer FE mesh. Figure 01 shows a comparison with a relatively coarse FE mesh. The support resultant is 16.84 kN. However, the resultant of the surface results is only 14.41 kN. If the FE mesh is refined at this point (see Figure 02), the results are similar. In Figure 03, the FE mesh has been refined further. The results are now exactly equal. The deviation at the start can be explained by the singular location and by the internal force size smoothing.
AnswerNo, unfortunately it's not possible to reverse the splitting later on. Just using the undo function is of course possible but just right after splitting the surface.You will have to delete the split surfaces and generate a new surface.
AnswerSo that the correct voltages are displayed on all surfaces, it is recommended to switch on the local axis system via the Project Navigator - Show the surface axis system. It can usually be seen that the respective surfaces have a different rotation of the surface axes than the other surfaces (see Figure 1).
AnswerBasically, elements in RFEM are rigidly connected. To solve this problem, two elements are suitable in RFEM. The line joints and the line releases. The difference is explained in the link below.
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