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05.43: Lateral‐torsional buckling of beams of double symmetrical and mono‐symmetrical cross‐sections loaded perpendicularly to the axis of symmetry: Experimental verification
Author(s) -
Horáček Martin,
Melcher Jindřich
Publication year - 2017
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.184
Subject(s) - buckling , structural engineering , beam (structure) , perpendicular , axis of symmetry , moment (physics) , symmetry (geometry) , rotation (mathematics) , materials science , engineering , physics , mathematics , geometry , classical mechanics
The current design procedures listed in the European standards provide general rules for the calculation of the effects of lateral torsional buckling of steel members. The buckling resistance of the ideal beam (without any imperfections) is represented by the elastic critical moment, which is used for the determination of the relative slenderness. In the general document of Eurocode 3 are no analytical solutions for the calculation of the elastic critical moments. The Czech and Slovak National Annex of EN 1993‐1‐1 provide the procedures for the elastic critical moment calculation for at least mono‐symmetrical profiles loaded in the plane perpendicular to the axis of symmetry. There are no comments in the national annexes of the other European Countries related to the determination of elastic critical moment by analytical way. This paper focuses on the experimental verification performed in the laboratory conditions in order to prove the save and efficient design of bended beams with respect to lateral torsional buckling based on the procedures listed in the Czech or Slovak National Annex. Freely supported beams are loaded in the 1/3 of the beam with 2 point loads. The special attention is given to the method of loading, which allows free lateral torsional buckling of the beam without any restraints to the horizontal displacement and rotation of the beam. In order to examine the pure effects of lateral torsional buckling the effects of local instabilities such as for example local buckling or web crushing under the concentrated load, the test specimens are supplemented by suitably located stiffeners.