Numerical Modelling of Thin-Walled Stainless Steel Structural Elements in Case of Fire |
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Authors: | Nuno Lopes Paulo Vila Real Luís Simões da Silva Jean-Marc Franssen |
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Affiliation: | (1) Department of Civil Engineering, LABEST - University of Aveiro, 3810-193 Aveiro, Portugal;(2) Department of Civil Engineering, ISISE - University of Coimbra, 3030 Coimbra, Portugal;(3) Structural Engineering, University of Liege, Liege, Belgium |
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Abstract: | In this paper, the structural response of stainless steel thin-walled elements submitted to fire is analysed numerically by
means of the geometrically and materially non-linear Finite Element program SAFIR, including imperfections. In order to make
these simulations, two main changes in the program were made: (i) the code was changed in order to deal with the stainless
steel 2D material constitutive law to be used with shell elements and (ii) the possibility of the program to take into account
residual stresses with shell finite elements was introduced. The stainless steel stress–strain relationship at high temperatures
was based on the one presented in part 1.2 of Eurocode 3. To model the strain hardening exhibited by the stainless steels,
using the shell element formulation, an approximation to the Eurocode 3 constitutive law was needed. Local and global geometrical
imperfections were considered in the simulations. The paper shows the influence of the residual stresses on the ultimate load-carrying
capacity of thin-walled stainless steel structural elements in case of fire. |
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