Review of European design provisions for buckling of aluminium members with longitudinal welds – part 1

Abstract

As part of the ongoing revision of the Eurocodes, design provisions in EN 1999-1-1 on the buckling of longitudinally welded aluminium compression members have been subjected to a critical review. Numerical investigations were conducted because a need for improvement was identified. This part 1 of the paper describes the individual steps of the revision and the modifications discussed, which include the introduction of longitudinally welded members. Before going into the numerical investigations in more detail, previous observations are presented regarding buckling classes and plateau lengths. In part 1 of the paper, explanations of the numerical investigations are limited to presenting the modelling of the geometry, the mechanical properties and the imperfections as well as their respective variation in the context of the parametric studies. The results of the numerical investigations and the proposed design approaches will be presented in detail in parts 2 and 3.

Review of European design provisions for buckling of aluminium members with longitudinal welds – part 2

“…Each configuration of T, P and C cross-sections made of materials I to III, VI to IX and XIII to XV was investigated with a comparatively high level of residual stresses (leading to c RS ) and zero residual stresses (leading to c) to determine the influence of residual stresses on resistance. The T and E cross-sections are typical cross-sections of types a and b (see [1], section 1.3) for strong-axis and weak-axis buckling respectively. The values of the reduction factor c for strong-axis buckling of these sections are larger than those for weak-axis buckling (i.e.…”

Review of European design provisions for buckling of aluminium members with longitudinal welds – part 3

“…Evaluation according to [3] Values in italics are predefined (partial factor g M1 according to EN 1999-1-1:2007) and do not result from the present statistical evaluation. 1) Values differ from those in [7] because the results of some individual FE calculations have been corrected.…”

“…A haz area of HAZ cross-section Values in italics are predefined (based on [3]) and do not result from the present statistical evaluation. 1) Evaluation with (A1/A) • (W/W 1 ) ratio set to unity.…”

“…The tests were originally evaluated using the area Values in italics are predefined (partial factor g M1 according to EN 1999-1-1:2007) and do not result from the present statistical evaluation. 1) Evaluation with (A 1 /A) • (W/W 1 ) ratio set to unity.…”