The rules of DIN EN 1993‑1‑1, Annex BB.2.2 assume a continuous rotational restraint over the beam's length. Stability Analysis Considering Secondary Beams According to, Annex BB.2.2 Hence, the ultimate limit state design cannot be fulfilled without the stabilizing effect of the secondary beams. Thus, the design according to Equation 6.54 results in 1.64. Under the assumption of a lateral and torsional restraint available at the member's start and end, an ideal critical moment for lateral torsional buckling M cr of 368 kNm is determined in RF‑STEEL EC3 in line with the verification according to, Clause 6.3.2. Stability Analysis Without Considering Secondary Beams According to Clause 6.3.2
Distribution of Bending Moment My for Load Combination CO1 = LC1 + LC2
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