I did not succeed to visualize the pre-deformations in the rendering mode in FE-LTB.

It is possible to see either the undeformed system or the stress distribution, but never the pre-deformation!

Answer

You can make the pre-deformations visible in the rendering mode after clicking the [Select Imperfections] button in the 2.3 Imperfections window (Figure 1).

The RSTAB work window appears. In the Navigator, you can see which eigenform is currently being displayed. Use the options to graphically check the first 10 eigenforms (Figure 2).

You can also view the individual eigenmodes in rendering mode and even animate them. The same function as in RSTAB is responsible for the rendering. After the calculation in FE-LTB, you can view the stress diagram, ratios, internal forces, deformations, and applied eigenform in the rendering via the [Graphics] button (Figure 3).

Keywords

Stress Deformation Internal forces

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RFEM Steel and Aluminum Structures
RF-FE-LTB 5.xx

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Lateral-torsional buckling analysis of members according to the second-order analysis (FEM)

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RSTAB 8.xx

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The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

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