Buckling of inelastic I-Beams under uniform moment

The flexural-torsional buckling of inelastic steel beams under uniform moment is discussed. An accurate model is proposed, which is based on the tangent modulus theory of buckling, which uses the strain-hardening moduli for the inelastic material, and which accounts for residual stresses. The predictions for this model for a W 8 multiplied by 31 beam are compared with those for the previous models and the relative significance of the assumptions are determined

Buckling of monosymmetric I-beams under moment gradient

The paper investigates the elastic lateral buckling of simply supported monosymmetric I-beams under moment gradient. Independent solutions are obtained using the finite integral method and the Rayleigh-Ritz energy approach. The elastic buckling moments depend on the degree of beam mono-symmetry, p, the beam parameter, K, and the end moment ratio, p. Buckled mode shapes reveal that the buckling deformations of the beams have complicated forms. It is found that the present design moment modification factor formula cannot satisfactorily predict the buckling capacities of monosymmetric I-beams. An alternative approximate buckling formula is proposed