Buckling curves for lateral torsional buckling of unrestrained beams

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Abstract

In Eurocode 3 two methods to determine the ultimate lateral torsional buckling load of steel beams in bending are presented: the General and the Specific Methods. Both methods make use of buckling curves, but the curves to be used are different for both methods. The ultimate lateral torsional buckling load can also be calculated using the Finite Element Method (FEM) by means of a geometrical and material non-linear analysis on a beam including imperfections (GMNIA). This paper compares the ultimate loads based on the design rules in Eurocode 3 for lateral torsional buckling of unrestrained beams in bending to the ultimate loads obtained with Finite Element simulations on the basis of a parameter study. It is concluded that the Specific Method gives a large over-estimation of the ultimate load found with FEM simulations, while the General Method gives good results. Therefore, Nationally Determined Parameters in the Specific Method should be chosen with care in the National Annexes.
Original languageEnglish
Title of host publicationProceedings of the Hommages á René Maquoi Birthday Anniversary, 14 December 2007, Luik, Belgium
EditorsVincent Ville de Goyet, de, Jean-Pierre Jaspart, Jacques Rondal
Place of PublicationLuik
PublisherUniversité de Liège
Pages239-248
Publication statusPublished - 2007
Eventconference; René Maquoi Birthday Anniversary; 2007-12-14; 2007-12-14 -
Duration: 14 Dec 200714 Dec 2007

Conference

Conferenceconference; René Maquoi Birthday Anniversary; 2007-12-14; 2007-12-14
Period14/12/0714/12/07
OtherRené Maquoi Birthday Anniversary

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