Computational Probabilistic Design of Time-Dependent Stability of Steel Beams

The reasonability of using probability-based approaches in the analysis of rolled and welded beams exposed to lateral torsional buckling is described. Buckling resisting moments and their uncertainties for rolled and equivalent welded flanged steel sections as particular members are analyzed. Time-dependent statistics of resisting and destructive bending moments of steel beams are considered and their features are found. Time-dependent survival probabilities of deteriorating and non-deteriorating steel beams under lateral torsional buckling are modelled. Computational probabilistic design on time-dependent stability of steel beams is based on the generalized reliability index conception. Differences in failure probabilities and reliability indexes of rolled and welded steel beams under lateral torsional buckling are illustrated by a numerical example.