The check is carried out in compliance with DIN 18800, Part 2, according to the equivalent beam method. For this, the internal forces of the beam ends are to be used that are determined by applying the second-order theory to the entire system.

Section & Material

The lateral torsional buckling problem is solved for single- and double-symmetric I and U profiles. These can be taken from the extensive section library or defined by the user.

Load & System

By specifying the internal forces of the beam ends and a point load or uniformly distributed load in both principal directions, the desired stress can be created.

Lateral Torsional Buckling Parameters

The calculation of the ideal lateral torsional buckling moment MKi,y is performed through variation of the elastic potential. The eigenvalue problem that results delivers the smallest positive load factor and thus the sought after lateral torsional buckling moment. This offers the advantage that the user does not need to specify the zeta moment coefficient.
Load eccentricity and elastic rotational bedding can be defined by the user.

The desired elastic rotational bedding can optionally be determined by the program:

Results

The calculation yields a detailed log of the results with system diagrams and all the formulas required for the check. This allows users to easily follow all calculations steps.

Calculation Examples

  Example 1: Two-hinged frame