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Mechanics of Distortional-Global Interaction in Fixed-Ended Lipped Channel Columns
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Orientador(es)
Resumo(s)
This work reports the results of a numerical investigation concerning the elastic post-buckling
behaviour offixed-endedthin-walledlipped channelcolumnsaffected bydistortional-global(D-G)interaction.
The columns analysed (i) exhibit cross-section dimensions and lengths ensuring simultaneous distortional and
global critical buckling loads, and (ii) contain critical-mode initial geometrical imperfections (linear
combinations of D and G buckling modes). For comparison and clarification purposes, the post-buckling
behaviour ofcolumnsbucklinginan“isolated” distortional mode and containing “pure” distortional
and global (flexural-torsional) initial geometrical imperfections are also analysed. The results presented and
discussed are obtained through geometrically non-linear Generalised Beam Theory (GBT) analyses and
provide the evolution, along given equilibrium paths, of the column deformed configuration (expressed in
GBT modal form),relevantdisplacementprofiles and modal participation diagrams, making it possible to
acquire in-depth knowledge on the column D-G interaction mechanics. Finally, particular attention is paid to
interpreting the differences exhibited by the several aforementioned column post-buckling behaviours.
Descrição
Palavras-chave
Fixed-ended lipped channel columns; Distortional-Global interaction; Generalized Beam Theory (GBT);Geometrically non-linear imperfect analysis (GNIA).
Contexto Educativo
Citação
Editora
Department of Civil Engineering, Honk-Kong University