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Numerical investigation on the fire resistance of partially encased steel columns

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Resumo:This paper presented the results of numerical analyses on the fire resistance of composite columns with partially encased steel columns (PEC). This investigation used 2D and 3D finite element models and assessed for the design method of composite elements under compression according to the Annex G of Eurocode 4. New proposals were presented to determine the buckling resistance of PEC under standard fire. The 2D and 3D numerical models were based on American and European steel profiles. The 2D thermal model was used to improve the design method of the current version of the Eurocode 4, enhancing the balance summation model, which is currently used to determine the plastic resistance to axial compression and the effective flexural stiffness of the four components of the cross-section. The 3D thermomechanical model used the temperature field for each fire rating time (30, 60, 90, and 120 min) and applied the incremental load step solution method, based on the Newton–Raphson, to determine the buckling load of partially encased columns with 3 and 5 m, considering different supporting conditions. These results present a safer buckling curve when compared to curve ‘‘c’’.
Autores principais:Hoffstaeter, Ricardo Anderson
Outros Autores:Piloto, P.A.G.; Martins, Carlos Humberto; Rigobello, Ronaldo
Assunto:Partially encased columns Fire resistance Buckling resistance
Ano:2023
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso restrito
Instituição associada:Instituto Politécnico de Bragança
Idioma:inglês
Origem:Biblioteca Digital do IPB

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