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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.
AnswerThe stress calculations are performed on the stress points of the cross-section.
Cross-sections of cross-section types
- Flat steel
- Square Steel
- Hexagonal steel
- Octagonal steel
- Wide flat steel
If a member with one of these cross-sections is subjected to the design by shear force or torsion, the solid cross-sections should be selected.
AnswerIt is correct that no corresponding load cases are displayed in Table 4.13 "Surfaces - Local Deformations".However, you can find them in Table 4.4 "Members - Local Deformations", for example. See Figure 01.If you now define the corresponding load cases for the max. If you want to see the deformations of an RC on a certain surface, you can integrate a member into this surface. So that this member does not influence the surface stiffness, it is recommended to For example, a very small cross-section can be used.If the member has been integrated or cross-linked correctly in the surface, the table shown in Figure 01 is obtained. Figure 02 shows the corresponding deformation in the surface component.Optionally, it is now possible to click into the row with the desired result (for example max u) to execute a right-click. In the shortcut menu, you can now use the option "Generate CO by Selected Row" which you can use to generate a CO that contains the load cases belonging to the selected value. See Figure 03.When you execute this command, you receive a CO from the RC with the corresponding load cases. See Figure 04 with the results of the generated CO and the max. Deformations in the considered field.
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).
AnswerWhen displaying the punching diameters by shear force in the critical perimeter, RFEM uses internal sections. The critical control perimeter automatically has an internal division. Thus, the result values are determined on each FE mesh node and on the internal division points. In the Display navigator, you can display all values for the sections or only the extreme value. Thus, a coarser division or output of values can not be set.
RSBUCK / RF-STABILITY calculates at least one critical load factor or one loading load and an associated buckling mode. The buckling length is then recalculated from the critical load (see here ).
The effective lengths calculated in this way should only be used by the members that buckle in the buckling mode. Figure 1 shows a structure where the rear columns buckle. Therefore, only the effective lengths calculated for these two columns should be used.
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.
AnswerA solid can be assigned with stiffness in all three directions (x, y, z). The material model for this is named Orthtropic Elastic 3D or Orthotropic Plastic 3D (picture 1).The stiffness can be defined for E-Modulus and Shear Modulus of the Solid. The direction is ordered according the orientation of the Solid (picture 2).
AnswerYes, you can define an area in the panel by clicking the button "options". Here you can define a customized area by moving the slider. In that case the areas with higher or lower stresses have no color.
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