Modal Decomposition Analysis of Buckling Deformations in Omega Section Profiles by Applying GBT Validated with FEM
DOI:
https://doi.org/10.70567/mc.v42.ocsid8343Keywords:
buckling, critical load, GBT, profile, thin wall, modes, omegaAbstract
Generalized beam theory, known primarily as GBT, whose kinematic basis is based on the decomposition of deformation modes, has received increasing interest in recent decades. This theory is able to distinguish between deformations caused by local buckling and those caused by global buckling, making it highly useful when applied to cold-formed thin-walled and open-walled profiles. However, its diffusion in Spanish-speaking countries is much less widespread, so the purpose of this paper is to conduct simple case studies that demonstrate its application potential. Omega-type thin-walled and opensection profiles of varying thicknesses were analyzed in detail using the free software GBTUL 2.0, with results validated using the finite element program FEMAP. From the studies carried out, it was concluded that for the cases analyzed, both programs yield similar and complementary results: FEMAP provides greater precision and GBTUL 2.0 allows for a more detailed interpretation of the contribution of the different buckling modes to the total deformation.
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