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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Local-distortional interaction in cold-formed steel beams: Behaviour, strength and DSM design
AbstractThis work presents and discusses numerical results concerning cold-formed steel simply supported beams subjected to uniform bending and exhibiting (i) three cross-section shapes (lipped channels, zed-sections and hat-sections), and (ii) two end support conditions (differing in the warping and local displacement/rotation restraints, which are either free or fully prevented). A systematic numerical investigation is carried out, in order to characterise the post-buckling behaviour and ultimate strength of beams experiencing more or less severe L-D interaction effects. 43 geometries and 11 yield stresses are considered for each combination of cross-section shape and support conditions, thus ensuring distinct (i) ratios between the local (McrL) and distortional (McrD) critical buckling moments (0.50 ≤ McrD /McrL ≤ 2.00), and (ii) local or distortional slenderness values, ranging from 0.50 to 3.50. The numerical results are obtained through Abaqus shell finite element analyses and concern the (i) post-buckling behaviour (elastic and elastic-plastic), ultimate strength and failure mechanisms of beams previously selected to undergo considerable L-D interaction. Based on the acquired information, a first contribution towards the Direct Strength Method (DSM) design of cold-formed steel beams undergoing different “levels” of L-D interaction is presented and discussed.
HighlightsPost-buckling behaviour and strength of cold-formed steel (CFS) beams undergoing local-distortional interaction are studied.Three types of local-distortional (L-D) interaction are investigated and mechanically characterised.Two distinct sets of simply supported lipped channel, hat and zed-section CFS beams are analysed.Beams affected by L-D interaction under major-axis, minor-axis and skew bending are studied.DSM-based strength curves against L-D interactive failures are proposed and their merits assessed.
Local-distortional interaction in cold-formed steel beams: Behaviour, strength and DSM design
AbstractThis work presents and discusses numerical results concerning cold-formed steel simply supported beams subjected to uniform bending and exhibiting (i) three cross-section shapes (lipped channels, zed-sections and hat-sections), and (ii) two end support conditions (differing in the warping and local displacement/rotation restraints, which are either free or fully prevented). A systematic numerical investigation is carried out, in order to characterise the post-buckling behaviour and ultimate strength of beams experiencing more or less severe L-D interaction effects. 43 geometries and 11 yield stresses are considered for each combination of cross-section shape and support conditions, thus ensuring distinct (i) ratios between the local (McrL) and distortional (McrD) critical buckling moments (0.50 ≤ McrD /McrL ≤ 2.00), and (ii) local or distortional slenderness values, ranging from 0.50 to 3.50. The numerical results are obtained through Abaqus shell finite element analyses and concern the (i) post-buckling behaviour (elastic and elastic-plastic), ultimate strength and failure mechanisms of beams previously selected to undergo considerable L-D interaction. Based on the acquired information, a first contribution towards the Direct Strength Method (DSM) design of cold-formed steel beams undergoing different “levels” of L-D interaction is presented and discussed.
HighlightsPost-buckling behaviour and strength of cold-formed steel (CFS) beams undergoing local-distortional interaction are studied.Three types of local-distortional (L-D) interaction are investigated and mechanically characterised.Two distinct sets of simply supported lipped channel, hat and zed-section CFS beams are analysed.Beams affected by L-D interaction under major-axis, minor-axis and skew bending are studied.DSM-based strength curves against L-D interactive failures are proposed and their merits assessed.
Local-distortional interaction in cold-formed steel beams: Behaviour, strength and DSM design
Martins, André Dias (Autor:in) / Camotim, Dinar (Autor:in) / Dinis, Pedro Borges (Autor:in)
Thin-Walled Structures ; 119 ; 879-901
13.06.2017
23 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Local-distortional interaction in cold-formed steel beams: Behaviour, strength and DSM design
| Online Contents | 2017
Local-distortional buckling interaction on cold-formed steel lipped channel beams
| Online Contents | 2016