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Flexural–torsional failure and DSM design of fixed-ended cold-formed steel columns at elevated temperatures
https://orcid.org/0000-0002-0683-3252
https://orcid.org/0000-0002-3974-5953
https://orcid.org/0000-0002-7994-2687
Abstract Recently, Dinis et al. (2019,2020) reported in-depth numerical investigations showing that the current Direct Strength Method (DSM) global design curve may severely underestimate the flexural–torsional (FT) failure loads of fixed-ended cold-formed steel (CFS) columns with slenderness above 1.5. This finding was based on the analysis of columns exhibiting various cross-section shapes and geometries, and covering wide slenderness ranges. Moreover, these authors used the failure load data gathered to develop, and propose a novel DSM column strength curve set that was shown to improve considerably the FT failure load prediction for those columns. The purpose of this work is to extend the scope of the previous investigations to fixed-ended CFS cold-formed columns failing in FT modes under elevated temperatures (up to 800 °C). The results presented and discussed consist of column FT post-buckling equilibrium paths and failure loads, obtained through geometrically and materially non-linear Ansys shell finite element analyses — to ensure covering wide FT slenderness ranges, several room-temperature yield stresses are considered. The model prescribed in Part 1–2 of Eurocode 3, for cold-formed steel, is adopted to describe the temperature-dependence of the steel material properties. Lastly, the numerical failure loads assembled in this work, together with numerical and experimental ones collected from the literature, are used to propose a modification of the DSM-based FT strength curve set developed by Dinis et al. (2020), making it capable of handling FT failures under elevated temperatures. Since the merit assessment of the modified strength curve set shows a visible improvement in FT failure load prediction quality, it is fair to argue that it constitutes a good starting point to search for an efficient general DSM-based design approach for CFS columns failing in FT modes at elevated temperatures.
Highlights Response and DSM design of CFS columns failing in FT modes at elevated temperatures. 8400 FE columns simulation for many cross-sections, yield stresses and temperatures. Buckling and post-buckling behaviour of columns at elevated temperatures. Failure loads under steady-state loading for the EC3:1.2 constitutive steel model. Proposal of DSM design curves for CFS fixed-ended columns at elevated temperatures.
Flexural–torsional failure and DSM design of fixed-ended cold-formed steel columns at elevated temperatures
https://orcid.org/0000-0002-0683-3252
https://orcid.org/0000-0002-3974-5953
https://orcid.org/0000-0002-7994-2687
Abstract Recently, Dinis et al. (2019,2020) reported in-depth numerical investigations showing that the current Direct Strength Method (DSM) global design curve may severely underestimate the flexural–torsional (FT) failure loads of fixed-ended cold-formed steel (CFS) columns with slenderness above 1.5. This finding was based on the analysis of columns exhibiting various cross-section shapes and geometries, and covering wide slenderness ranges. Moreover, these authors used the failure load data gathered to develop, and propose a novel DSM column strength curve set that was shown to improve considerably the FT failure load prediction for those columns. The purpose of this work is to extend the scope of the previous investigations to fixed-ended CFS cold-formed columns failing in FT modes under elevated temperatures (up to 800 °C). The results presented and discussed consist of column FT post-buckling equilibrium paths and failure loads, obtained through geometrically and materially non-linear Ansys shell finite element analyses — to ensure covering wide FT slenderness ranges, several room-temperature yield stresses are considered. The model prescribed in Part 1–2 of Eurocode 3, for cold-formed steel, is adopted to describe the temperature-dependence of the steel material properties. Lastly, the numerical failure loads assembled in this work, together with numerical and experimental ones collected from the literature, are used to propose a modification of the DSM-based FT strength curve set developed by Dinis et al. (2020), making it capable of handling FT failures under elevated temperatures. Since the merit assessment of the modified strength curve set shows a visible improvement in FT failure load prediction quality, it is fair to argue that it constitutes a good starting point to search for an efficient general DSM-based design approach for CFS columns failing in FT modes at elevated temperatures.
Highlights Response and DSM design of CFS columns failing in FT modes at elevated temperatures. 8400 FE columns simulation for many cross-sections, yield stresses and temperatures. Buckling and post-buckling behaviour of columns at elevated temperatures. Failure loads under steady-state loading for the EC3:1.2 constitutive steel model. Proposal of DSM design curves for CFS fixed-ended columns at elevated temperatures.
Flexural–torsional failure and DSM design of fixed-ended cold-formed steel columns at elevated temperatures
https://orcid.org/0000-0002-0683-3252
https://orcid.org/0000-0002-3974-5953
https://orcid.org/0000-0002-7994-2687
Abstract Recently, Dinis et al. (2019,2020) reported in-depth numerical investigations showing that the current Direct Strength Method (DSM) global design curve may severely underestimate the flexural–torsional (FT) failure loads of fixed-ended cold-formed steel (CFS) columns with slenderness above 1.5. This finding was based on the analysis of columns exhibiting various cross-section shapes and geometries, and covering wide slenderness ranges. Moreover, these authors used the failure load data gathered to develop, and propose a novel DSM column strength curve set that was shown to improve considerably the FT failure load prediction for those columns. The purpose of this work is to extend the scope of the previous investigations to fixed-ended CFS cold-formed columns failing in FT modes under elevated temperatures (up to 800 °C). The results presented and discussed consist of column FT post-buckling equilibrium paths and failure loads, obtained through geometrically and materially non-linear Ansys shell finite element analyses — to ensure covering wide FT slenderness ranges, several room-temperature yield stresses are considered. The model prescribed in Part 1–2 of Eurocode 3, for cold-formed steel, is adopted to describe the temperature-dependence of the steel material properties. Lastly, the numerical failure loads assembled in this work, together with numerical and experimental ones collected from the literature, are used to propose a modification of the DSM-based FT strength curve set developed by Dinis et al. (2020), making it capable of handling FT failures under elevated temperatures. Since the merit assessment of the modified strength curve set shows a visible improvement in FT failure load prediction quality, it is fair to argue that it constitutes a good starting point to search for an efficient general DSM-based design approach for CFS columns failing in FT modes at elevated temperatures.
Highlights Response and DSM design of CFS columns failing in FT modes at elevated temperatures. 8400 FE columns simulation for many cross-sections, yield stresses and temperatures. Buckling and post-buckling behaviour of columns at elevated temperatures. Failure loads under steady-state loading for the EC3:1.2 constitutive steel model. Proposal of DSM design curves for CFS fixed-ended columns at elevated temperatures.
Flexural–torsional failure and DSM design of fixed-ended cold-formed steel columns at elevated temperatures
Bicelli, Antônio Albuquerque (Autor:in) / Landesmann, Alexandre (Autor:in) / Camotim, Dinar (Autor:in) / Dinis, Pedro Borges (Autor:in)
Thin-Walled Structures ; 169
25.08.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch