Abstract
The present study documents some inconsistencies observed when applying the lateral torsional buckling provisions of the Canadian standards of steel structures to characterize the elastic critical moments for monosymmetric beams subjected to linear moment gradients. An overview of the underlying theoretical background is presented and the reasons behind the discrepancies observed between standard-recommended solutions on one hand, and theoretical and finite element solutions on the other hand are discussed. An improved solution is then developed by generating a parametric study based on finite element analyses and developing regression equations to estimate the critical moments for monosymmetric beams under linear moments inducing double curvature. The expressions are cast in a dimensionless form as a function of four parameters. The potential use of the proposed solution is subsequently illustrated through a design example.
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