Structural member stability verification in the new Part 1-1 of the second generation of Eurocode 3:Part 2: Member buckling design rules and further innovations

This two-part article gives an overview of the developments ofthe structural member verification in prEN 1993-1-1:2020 “Eurocode3: Design of steel structures – part 1-1: General rules andrules 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 yearsalso yielded topics needing further development. Based on this,the current version of EN 1993-1-1 has been developed into anew draft version prEN 1993-1-1:2020 enhancing “ease of use”.The technical content of this new draft was laid down at theend of 2019. Many improvements to design rules have beenestablished with respect to structural analysis, resistance ofcross-sections and stability of members. This two-part articlefocuses on member stability design rules and deals with thebasis for the calibration of partial factors, the introduction ofmore economic design rules for semi-compact sections,methods for structural analysis in relation to the appropriatemember stability design rules, new design rules for lateraltorsional buckling plus other developments and innovations.This second part of the article is dedicated to illustrating themost relevant changes to member buckling design rules