GBT-based buckling mode decomposition from finite element analysis of thin-walled members

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• 作者：Mihai Nedelcu ; ^{mihai.nedelcu@mecon.utcluj.ro}
• 关键词：Thin-walled member ; Buckling analysis ; Mode decomposition ; Finite element method ; Generalised beam theory
• 刊名：Thin-Walled Structures
• 出版年：2012
• 期刊代码：175_02638231
• 类别：et
• 出版时间：May, 2012
• 卷：54
• 期：Complete
• 页码：156-163
• 文件大小：614 K

摘要

This paper presents an original method based on the Generalised Beam Theory (GBT) capable to decompose the elastic buckling modes from a shell finite element analysis (FEA) of an isotropic thin-walled member, into pure buckling modes of global, distorsional or local nature. The main novelty lies in using only the GBT cross-sectional deformation modes instead of member base mode shapes. The contribution of each pure buckling mode can be calculated, allowing a better understanding of the member post-buckling behaviour and strength reserve. Following the GBT classical assumptions, the membrane shear strains and transverse extensions are neglected. The modal participations obtained from FEA are in good agreement with the values calculated via classical GBT approach.