Statistical evaluation of the lateral–torsional buckling resistance of steel I-beams, Part 1: Variability of the Eurocode 3 resistance model

Lateral–torsional buckling assessment of steel beams through a stiffness reduction method

“…Similar to that for flexural buckling, a stiffness reduction function for LTB can be derived using the EN 1993-1-1 [10] instability assessment formulae for beams. However, recent studies [27][28][29] have identified inaccuracies in the two sets of LTB curves provided in EN 1993-1-1 [10]. The first is given in Clause 6.3.2.2 and may be applied to beams with any cross-section type, which will henceforth be referred to as the general case LTB equation, and the second is given in Clause 6.3.2.3 and applies principally to I sections; the latter will henceforth be referred to as the specific case LTB equation.…”

Buckling curves for heavy wide flange QST columns based on statistical evaluation

“…The partial factor associated with the uncertainty of the resistance model γ Rd was computed for different load cases and section types using the three different design models for lateral-torsional buckling available in EN 1993-1-1, Rebelo et al [11].…”

“…(2), the factors from Refs. [11] and [12] were used to arrive at γ M1 -values for different load cases and steel grades.…”

“…Therefore, finite element analyses form the basis of the present study. The methodology adopted by Rebelo et al [11] and in line with Annex D of EN 1990 will be used to check the reliability of proposed buckling curves for heavy wide flange HISTAR 460 sections.…”

“…[11]. For any heavy QST column i a comparison can be made between its experimental resistance (r e,i ) and its theoretical resistance (r t,i ):…”