Abstract
AbstractThis two‐part article gives an overview of the developments of the structural member verification in prEN 1993‐1‐1:2020 ”Eurocode 3: Design of steel structures – part 1‐1: General rules and rules for buildings“, one of the second generation of Eurocodes. These developments were undertaken by Working Group 1 (WG1) of Subcommittee CEN/TC250/SC3 and by Project Team 1 (SC3.PT1) responsible for drafting the new version of EN 1993‐1‐1. In the past, WG1 collected many topics needing improvement, and the systematic review conducted every five years also yielded topics needing further development. Based on this, the current version of EN 1993‐1‐1 has been developed into a new draft version prEN 1993‐1‐1:2020 enhancing ”ease of use“. The technical content of this new draft was laid down at the end of 2019. Many improvements to design rules have been established with respect to structural analysis, resistance of cross‐sections and stability of members. This two‐part article focuses on member stability design rules and deals with the basis for the calibration of partial factors, the introduction of more economic design rules for semi‐compact sections, methods for structural analysis in relation to the appropriate member stability design rules, new design rules for lateral torsional buckling plus other developments and innovations. This second part of the article is dedicated to illustrating the most relevant changes to member buckling design rules.
Highlights
A degree of ambiguity results from the fact that differences are found between the code curves when they are compared with curves determined by numerical FEM simulations using advanced geometrically and materially non-linear analyses with imperfections (GMNIA)
Over the past two decades, knowledge of the specific lateral torsional (LT) buckling behaviour of imperfect members has significantly increased as a result of numerous numerical (GMNIA) simulations using the FE method
This was done through the use of a factor “fM”, which is given for a large set of practically relevant bending moment diagrams in prEN 1993-1-1:2020 and may be seen as an “over-strength” factor for moment diagrams that diverge from the uniform one and mainly accounts for the following two mechanical effects, see Fig. 3: a) Firstly, the factor accounts for the fact that the point with the maximum in-plane bending moment may differ significantly from the point on the beam most affected by lateral torsional deformations caused by buckling
Summary
This two-part article gives an overview of the developments of the structural member verification in prEN 1993-1-1:2020 “Euro code 3: Design of steel structures – part 1-1: General rules and rules for buildings”, one of the second generation of Eurocodes. Many improvements to design rules have been established with respect to structural analysis, resistance of cross-sections and stability of members This two-part article focuses on member stability design rules and deals with the basis for the calibration of partial factors, the introduction of more economic design rules for semi-compact sections, methods for structural analysis in relation to the appropriate member stability design rules, new design rules for lateral torsional buckling plus other developments and innovations. This second part of the article is dedicated to illustrating the most relevant changes to member buckling design rules. Keywords steel structures; structural stability; Eurocode 3; standardization; flexural buckling; lateral torsional buckling; cross-sectional capacity
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