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Title: Equivalent temperature prediction for concrete-filled cold-formed steel (CF-CFS) built-up column sections (part B)
Authors: Rahnavard, Rohola 
Craveiro, Hélder D. 
Simões, Rui A. 
Santiago, Aldina 
Keywords: Concrete inner core; Concrete outer core; Embedded steel area; Equivalent temperature; Heat transfer analysis
Issue Date: 2022
Project: FCT grant agreement 2021.06528BD 
FCT grant agreement 2020.03588.CEECIN 
FEDER Competitivity Factors Operational Programme-COMPETE 
FCT/MCTES UIDB/04029/2020 
Serial title, monograph or event: Case Studies in Thermal Engineering
Volume: 35
Abstract: Innovative concrete-filled cold-formed steel (CF-CFS) built-up column sections subjected to axial compression and elevated temperatures were previously investigated, assessing their structural fire performance. However, the analytical fire resistance methodology presented in the EN1994-1-2 requires advanced heat transfer analysis to compute the temperature evolution of the steel and concrete components of the composite cross-section. This paper presents a set of empirical formulations to predict equivalent temperature for steel and concrete components of CF-CFS built-up column sections. The finite element modeling technique to predict temperature evolution through the CF-CFS built-up column sections was calibrated using a 2-D heat transfer analysis (part A of this study). As a simplification, the concrete infill was divided into two areas, namely inner and outer core areas. The equivalent temperature of the steel section and the steel embedded area were also considered. The results showed good accuracy of the proposed empirical formulas.
ISSN: 2214157X
DOI: 10.1016/j.csite.2022.102111
Rights: openAccess
Appears in Collections:I&D ISISE - Artigos em Revistas Internacionais

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