562x

2020-01-02

Question

I have not succeeded in visualizing the pre-deformations in the rendering mode in FE‑LTB.I only 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 Window 2.3 Imperfections (Image 01).

The RSTAB work window appears. In the Navigator, you can see which mode shape is currently being displayed. Use the options to graphically check the first 10 mode shapes (Image 02).

You can also view the individual mode shapes 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, design ratios, internal forces, deformations, and applied mode shape in the rendering using the [Graphics] button (Image 03).

Selecting Imperfection

Mode Shapes

Rendering

Do you have any questions?

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Videos

Knowledge Base

KB 000585 | Calculation of Warping Springs for Consideration in Lateral-Torsional Buckling Analysis ...

Length: 00:01:25 min

Knowledge Base

KB 001669 | Lateral-Torsional Buckling in Timber Construction | Examples 2

Length: 00:02:15 min

Knowledge Base

KB 001647 | Lateral-Torsional Buckling in Timber Construction | Examples 1

Length: 00:03:57 min

Knowledge Base

KB 001625 | Lateral-Torsional Buckling in Timber Construction | Theory

Length: 00:00:26 min

FAQ

FAQ 003298 | What are the options in RFEM or RSTAB for determining the ideal elastic critical ...

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Knowledge Base Articles

In the case of open cross-sections, the torsional load is removed mainly via secondary torsion, since the St. Venant torsional stiffness is low compared to the warping stiffness. Therefore, warping stiffeners in the cross-section are particularly interesting for the lateral-torsional buckling analysis, as they can significantly reduce the rotation. For this, end plates or welded stiffeners and sections are suitable.

The previous article, titled Lateral-Torsional Buckling in Timber Construction | Examples 1, explains the practical application for determining the critical bending moment M_crit or the critical bending stress σ_crit for a bending beam's lateral buckling using simple examples. In this article, the critical bending moment is determined by considering an elastic foundation resulting from a stiffening bracing.

Single-Span Beam with Lateral and Torsional Restraint and Without Intermediate Support

The article titled Lateral-Torsional Buckling in Timber Construction | Theory explains the theoretical background for the analytical determination of the critical bending moment M_crit or the critical bending stress σ_crit for the lateral buckling of a bending beam. This article uses examples to verify the analytical solution with the result from the eigenvalue analysis.

Slender bending beams that have a large h/w ratio and are loaded parallel to the minor axis tend to have stability issues. This is due to the deflection of the compression chord.

Product Features

Use the "Independent mesh preferred" option in the FE mesh settings to create an independent FE mesh for the integrated objects. This allows you to generate a significantly more detailed and precise FE mesh for individual objects that are integrated into one another.