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Abstract:	Die Grundlagen und Anwendungen der Overall Imperfection Method (OIM) (Vollständige Imperfektionsmethode) für normalkraft- und/oder biegebeanspruchte Tragwerke werden erstmals für einfachsymmetrische I-Querschnitte vorgestellt. Im Gegensatz zum Biegeknickversagen normalkraftbeanspruchter Stützen mit doppeltsymmetrischem Querschnitt stellt sich bei einfachsymmetrischen Querschnitten Biegetorsionsversagen ein. Die zusätzlich zur Biegeverformung gekoppelt auftretende Rotation des Querschnitts um die Schubmittelpunktsachse ist deshalb beim Ansatz der Vorverformung der Imperfektionsmethode ebenfalls zu berücksichtigen. Auch das Biegedrillknicken biegebeanspruchter Träger verhält sich bei einfachsymmetrischen Querschnitten wegen des Abstands zwischen Schwer- und Schubmittelpunkt anders. Dieser Aufsatz zeigt erstmals auch die dazu notwendigen Erweiterungen sowie die automatische Ermittlung der eigenformbasierten Amplituden der vollständigen Anfangsimperfektion und drei Anwendungsbeispiele. Eigenshape based imperfection method for beam-columns with mono-symmetric I-sections This paper shows for the first time the application of the Overall Imperfection Method (OIM) for columns, beams and beam-columns with mono-symmetric I cross-section. The buckling failure mode of compressed members with mono-symmetric I-section is torsional-flexural like. The second-order effect from the rotation around the longitudinal shear axis during the loss of stability is taken into account when the amplitude of the initial imperfection is calculated for the compressed members. For beams, the buckling behaviour is also different from doubly symmetric cross-section because the shear centre and the centre of gravity of the cross-section do not meet at the same position. This paper shows the extension and the usability of the OIM for steel structures with mono-symmetric I-section. The automatic determination of the equivalent amplitudes for columns, beams and beam-columns are presented for the first time. The practicality of the proposed method is demonstrated for single and multi-span members with three examples.
Source:	Stahlbau 90 (2021), No. 8
Page/s:	600-613
Language of Publication:	German

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