Numerical Modelling of the Lateral Buckling of Steel I Beams Subject to Different Boundary Conditions

摘要

This paper is focused to study the buckling of the steel I-shaped beams with doublyrnsymmetry with two boundary conditions under uniform moment action M, for fivernspans L. The work is carried out through two types of analysis; lateral torsionalrnbuckling elastic theory of beams, as well as the effective length method, andrnnumerical techniques of bifurcation, employing the FEM. The steel walls of the webrnand flanges the beam are modelled with solid and shells elements to obtain byrnnumerical stability analysis the critical moment Mcrit. The stability linear analysisrnallowed obtaining the numerical results corresponding to Mcrit of the beams by tworntypes of numerical models and three different meshing. The numerical results arerncompared with the analytical solutions and the AISC recommendation.