Support Conditions for Lateral-Torsional Buckling

Tips & Tricks

The boundary conditions of a member have a great effect on the elastic critical moment for lateral-torsional buckling Mcr. In RF‑/STEEL EC3, you can define the factors kz and kw separately. Thus, you can individually determine the degrees of freedom.

The effective length factor kz specifies the lateral restraint uy and the rotational restraint φz on member ends, the warping length factor kw specifies the torsion φx about the longitudinal member axis and warping restraint w.


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RFEM Steel and Aluminum Structures

Add-on Module

Design of steel members according to Eurocode 3

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