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07.20: Application of the compound strip method in buckling analysis of cold‐formed steel built‐up sections
Author(s) -
Khezri Mani,
Abbasi Mandana,
Rasmussen Kim J. R.
Publication year - 2017
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.210
Subject(s) - fastener , cold formed steel , structural engineering , finite element method , stiffness , buckling , cold forming , stiffness matrix , parametric statistics , finite strip method , connection (principal bundle) , beam (structure) , materials science , engineering , mathematics , statistics
ABSTRACT In this paper, the compound strip method is utilised and extended for the stability analysis of cold‐formed steel built‐up sections. The discrete fasteners are incorporated in the analysis such that they can be placed anywhere within the length of the member. A beam element with geometrical and material properties of the fastener is adopted to model the connection between the individual sections. The stiffness matrix terms for the connection element are derived and added directly to the global stiffness matrix of the considered built‐up sections. The proposed numerical technique is verified through various examples and the results are compared with the finite element solutions. The results obtained demonstrate that the developed technique can accurately and efficiently model the behaviour of cold‐formed steel built‐up sections. Furthermore, the influence of the fasteners properties, their longitudinal spacing and also the boundary conditions on the overall buckling behaviour of built‐up sections is examined through numerical examples. The simplicity of the proposed technique facilitates an extensive parametric study of cold‐formed built‐up sections including the search for optimal placement of fasteners and combinations of component sections in built‐up profiles.