Publication detail

On the Choice of Eigenmode Shapes for Interactive Cases of Local and Global Buckling of RHS/SHS and I-Shaped Sections

MÜLLER, A. VILD, M. TARAS, A.

Original Title

On the Choice of Eigenmode Shapes for Interactive Cases of Local and Global Buckling of RHS/SHS and I-Shaped Sections

Type

conference paper

Language

English

Original Abstract

Better and simpler possibilities of structural optimization due to increasing computational power but also for reasons of environmental sustainability, the use of materials and their reusability lead to greater acceptance towards more advanced numerically intensive, so-called “design by analysis” methods like geometrically and materially nonlinear analyses with imperfections (GMNIA). The general choice of imperfections and their combination in such models, especially for slender cross-sections of intermediate length prone to an interaction between a global and local plate-buckling, is crucial in terms of the reached load-bearing capacity. Annex C of EN 1993-1-5 make use of the “70%-rule” for the combination of imperfection modes and amplitudes. This rule postulates that two GMNIA calculations should be carried out when local and global interactive buckling may be dominant; one with 100% + 70% of the maximum specified amplitude in either case. In addition, extended information is provided on the choice and combination of imperfections in the newly introduced and currently available draft of the prEN1993-1-14:2020 (Design assisted by finite element analysis). Although information is provided how the local and global imperfections should be combined, it is not stated when it is relevant to consider those. Based on carried out GMNIA simulations on SHS/RHS and I-shaped sections, this paper presents a general decision support on the choice of equivalent imperfections. Based on numerical analysis, the developed flowchart and design routine allows for the decision whether the consideration of the interaction of local and global imperfections is required or not.

Keywords

Imperfection sensitivity; GMNIA; local buckling; interactive buckling; hollow sections; I-sections

Authors

MÜLLER, A.; VILD, M.; TARAS, A.

Released

14. 9. 2022

Publisher

Wiley

ISBN

2509-7075

Periodical

ce/papers

Year of study

5

Number

4

State

Federal Republic of Germany

Pages from

957

Pages to

965

Pages count

9

URL

https://onlinelibrary.wiley.com/doi/full/10.1002/cepa.1840

BibTex

@inproceedings{BUT179469,
  author="Andreas {Müller} and Martin {Vild} and Andreas {Taras}",
  title="On the Choice of Eigenmode Shapes for Interactive Cases of Local and Global Buckling of RHS/SHS and I-Shaped Sections",
  booktitle="Special Issue:SDSS 2022",
  year="2022",
  journal="ce/papers",
  volume="5",
  number="4",
  pages="957--965",
  publisher="Wiley",
  doi="10.1002/cepa.1840",
  issn="2509-7075",
  url="https://onlinelibrary.wiley.com/doi/full/10.1002/cepa.1840"
}