Buckling modes identification from FEA of thin-walled members using only GBT cross-sectional deformation modes |
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Affiliation: | 1. Department of Structural Engineering, School of Civil Engineering, Architecture and Urban Design, University of Campinas, Av. Albert Einstein, 951, 13083-852 Campinas, Brazil;2. CERIS, DECivil, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal |
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Abstract: | This paper presents the latest developments of an original method based on Generalized Beam Theory (GBT) capable to identify the fundamental deformation modes of global, distorsional or local nature, in general buckling modes provided by the shell finite element analysis (FEA) of isotropic thin-walled members. This method has the advantage of using only the GBT cross-sectional deformation modes instead of the member base mode shapes. The participation of each fundamental buckling mode can be calculated, allowing an accurate and quantitative evaluation of the coupled instability. There are no restrictions regarding the element cross-sectional shape, loading and quite recently discovered, boundary conditions. |
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Keywords: | Thin-walled member Buckling analysis Modal identification Shell finite element analysis Generalised beam theory |
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