The structural analysis software RFEM 6 is the basis of a modular software system. The main program RFEM 6 is used to define structures, materials, and loads of planar and spatial structural systems consisting of plates, walls, shells, and members. The program also allows you to create combined structures as well as to model solid and contact elements.
RSTAB 9 is a powerful analysis and design software for 3D beam, frame, or truss structure calculations, reflecting the current state of the art and helping structural engineers meet requirements in modern civil engineering.
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A solid of revolution can be created using the "Rotate" function. First, select the surface to be rotated, then open the "Rotate - Copy" dialog box by clicking the "Edit → Rotate" in the menu, the shortcut menu of the object, or the corresponding toolbar button. In the "Rotate - Copy" dialog box (Image 01), you must then define the number of copies as one. Furthermore, you can specify the desired angle of rotation and the axis of rotation.
In the "Detail Settings for Move/Rotate/Mirror" dialog box, which you can open by clicking the "Edit Expanded Settings" button, select the "Create new solid bodies between the selected surfaces and their copies" check box (Image 02).
After clicking [OK], the solid is created (Image 03).
RF‑/ALUMINUM checks the symmetry of general cross-sections and compares them with the SHAPE‑THIN evaluation when activating the "Determine symmetry by module and compare with SHAPE‑THIN definition" check box (Image 01).
If the two methods provide different results, the corresponding error message appears (Image 02).
Usually, there are small inaccuracies in the SHAPE‑THIN cross-section. Thus, the cross-section Sec‑1.du9 shown in Image 03 is not absolutely symmetrical to the Z‑axis: The Z‑coordinates of Node 1 and Node 4 as well as Node 55 and Node 60 do not match in the second decimal place.
SHAPE‑THIN classifies the cross-section as asymmetrical, but RF‑/ALUMINUM as monosymmetric to the z‑axis, so the error message shown in Image 02 appears.
The SHAPE‑THIN cross-section should be checked for symmetry. When modeling in SHAPE‑THIN, it is useful to display only one side of the cross-section and create the other half by mirroring. This is also shown in the video.
While holding down the Ctrl key, select the nodes whose concentrated loads you want to copy.
Now, click the [Move or Copy] button. In the subsequent dialog box, enter the number of copies and the displacement vector. In the Detail Settings for Move/Rotate/Mirror dialog box, select the Copy Including Loading check box.
After clicking [OK] to confirm, all preselected concentrated loads are copied around the corresponding vector.
To do this, Detail Settings has additional options of the functions "Move", "Rotate", or "Mirror"; see Image 01.
For example, if there is an annular surface to be designed, and the center point as well as the inside and outside radius are known, proceed as follows:
The easiest way is to create a new line support for the respective situation. This can also be related, for example, to the local axis system and rotated, if necessary.
In RFEM and RSTAB, it is not possible to use the symmetry of the structure to calculate only half of the structure.
However, it is possible to create only half of the structure including the loads and then generate the other half using the menu tool "Edit → Select → All" and then "Edit → Mirror". In the Mirror dialog box, it is necessary to select the "Create copy" option and the "Copy including loading" option under [Details] (see Image 01).
This way, you can omit the supports in the mirror axis and obtain more realistic results.
In the detail settings for the DSTV interface, you can specify that the cross-sections of the L and Z type are mirrored: Menu "File" → "Import", tab DSTV Interface (*.stp)
Unselect the check box (see the image).