Browsing by Author "Hoffstaeter, Ricardo Anderson"
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- Buckling resistance of partially encased columns under firePublication . Piloto, P.A.G.; Hoffstaeter, Ricardo Anderson; Rigobello, Ronaldo; Soufyane, Amari; Benlakehal, Nourredine O.The fire resistance of partially encased columns depends on the temperature evolution during fire exposure. This work aims to evaluate the effect of the balanced summation model on the design of the buckling load of Partially Encased Columns under fire situation. New improvements will be presented to assess fire resistance, suggesting some modification in the Annex G of Eurocode EN 1994-1-2. The advanced calculation method is based on the 3D modelling of the Partially Encased Column, using steel profiles ranging from IPE200 to IPE500 and HEB160 to HEB500, and using different buckling lengths. An incremental and interactive procedure is used to solve the geometric and material non-linear behaviour. The temperature effect is taken into account, using the uncouple thermal-structural analysis. The results obtained by the numerical simulations are in good agreement with the new simple calculation method and are also useful to prescribe the buckling curve that best fits the 3D simulation results.
- Estabilidade de pilares mistos parcialmente revestidos sob ação do fogoPublication . Hoffstaeter, Ricardo Anderson; Piloto, P.A.G.; Rigobello, RonaldoA resistência ao fogo de pilares parcialmente revestidos, dependem da evolução da temperatura durante a exposição ao fogo. Este trabalho visa avaliar o efeito do método da soma pesada na conceção da carga resistente à encurvadura de pilares parcialmente revestidos em situação de incêndio, de acordo com as normas europeias.
- Numerical Investigation on the Fire Resistance of Partially Encased Steel ColumnsPublication . Hoffstaeter, Ricardo Anderson; Piloto, P.A.G.; Martins, Carlos Humberto; Rigobello, RonaldoThis 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’’.
- Numerical investigation on the fire resistance of partially encased steel columnsPublication . Hoffstaeter, Ricardo Anderson; Piloto, P.A.G.; Martins, Carlos Humberto; Rigobello, RonaldoThis 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’’.