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Author(s):	Kindmann, R.; Beier-Tertel, J.
Title:
Abstract:	Der Nachweis ausreichender Tragfähigkeit wird bei biegedrillknickgefährdeten Trägern in der Regel mit Hilfe von Abminderungsfaktoren geführt. Die Werte nach DIN 18800-2 und DIN EN 1993-1-1 (EC 3) stimmen nicht überein, sondern weisen bereichsweise große Unterschiede auf. Zur Klärung des Sachverhalts werden für ausgewählte Basissysteme genaue Abminderungsfaktoren nach der Fließzonentheorie berechnet. Dabei zeigt sich, dass vergleichbare Werte in Abhängigkeit von der Querschnittsgeometrie um bis zu 32 % streuen. Als Parameter, mit dem die Profilabhängigkeit erfasst werden kann, wird das Verhältnis ly/IT identifiziert. Auf Grundlage dieser Erkenntnisse wird die Genauigkeit der Abminderungsfaktoren in den genannten Vorschriften beurteilt und festgestellt, dass eine Anpassung an den aktuellen Erkenntnisstand erforderlich ist. Reduction factors for lateral torsional buckling of hot rolled profiles - fundamentals. The resistance of members endangered by lateral torsional buckling is usually verified using reduction factors. The values of DIN 18800-2 and DIN EN 1993-1-1 (EC 3) do not match and partly show big differences. For a clarification of this issue the reduction factors of selected basic structural systems are being determined according to the plastic zones theory. It can be recognized that corresponding values differ up to 32 % depending on the cross-section geometry. The ratio ly/IT is being identified as a parameter covering the dependency of the crosssection. On this basis the reduction factor accuracy of the standards mentioned previously is being analysed with the conclusion, that an adjustment to the current state of knowledge is necessary.
Source:	Stahlbau 79 (2010), No. 1
Page/s:	25-33
Language of Publication:	German

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