Ocena zwichrzenia sprężystego na podstawie interakcji symetrycznych i antysymetrycznych stanów obciążenia

Zbigniew Stachura

Abstract

This paper presents the elastic lateral-buckling instability problem of steel bi-symmetric I-section beams subjected to mono-axial bending about major principal axis. In reference to the beam under moment gradient, an alternative method for a direct determination of the elastic critical moment for lateral-torsional buckling, based on the superposition of the symmetric and anti-symmetric buckling modes has been introduced herein. The proposed analytical approach has been compared with the results of numerical simulations and demonstrated on the example of a simple supported beam subjected to bending under support moments and the span load applied at the shear centre of mid-length section of the beam