About lateral torsional buckling of steel beams - geometrically exact nonlinear theory results. / Sobre o estudo da flambagem lateral de vigas de aço por meio da utilização de uma teoria não-linear geometricamente exata.
AUTOR(ES)
Jairo Fruchtengarten
DATA DE PUBLICAÇÃO
2005
RESUMO
The elastic lateral buckling moment is generally obtained in technical literature by means of approximated theories, and defined just for some common cases. However, the use of recent computational techniques allows that lateral-torsional bucklings study doesnt remain restricted to this few cases. The intend of this work is to establish accurate values for the elastic critical moment of steel beams in several cases of loading and end-restraint, using a Geometrically Exact Nonlinear Theory. This results are compared with the ones derived from approximate theories, in particular, Brazilian code NBR8800:1986, American Specification prAISC-LRFD:2003, and European Prestandards prEN1993-1-1:2002 Stage 54 and prEN1999-1-1:2004 Stage 54. A parametrical analysis is performed for doubly-symmetric I-beams using the finite element program PEFSYS for usual range in conventional structures. The influence of warping and lateral rotation restraints is studied for four idealized support conditions. Some other cases, like transverse load applied above and below shear center and presence of bracings along the span, are accounted of to corroborate the validity and the powerful of this procedure.
ASSUNTO(S)
steel structures beams flambagem structural stability estruturas de aço buckling estabilidade estrutural vigas
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