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Design of lean duplex stainless steel tubular sections subjected to concentrated end bearing loads at elevated temperatures
https://orcid.org/0000-0002-2295-8725
https://orcid.org/0000-0001-9421-738X
Abstract Design rules for web crippling of stainless steel tubular sections at elevated temperatures are currently unavailable. In this study, non-linear finite element models (FEMs) were developed for the web crippling of cold-formed lean duplex stainless steel (CFLDSS) square and rectangular hollow sections under the concentrated end bearing loads, namely the loading conditions of End-One-Flange (EOF), End-Two-Flange (ETF) and End Loading (EL). After successful validation of the FEMs, an extensive parametric study of 210 CFLDSS tubular sections at elevated temperatures (up to 950 °C) was performed. The appropriateness of the web crippling design rules in the current international specifications and literature was examined by comparing their ultimate strength predictions with those obtained from the parametric study. The material properties at room (ambient) temperature condition were substituted by those at elevated temperatures. It was found that the predictions by the current design specifications and the literature were generally unconservative and not reliable, while the European Code provided reliable but generally very conservative predictions. A new design method by using the Direct Strength Method was proposed for the web crippling of CFLDSS tubular sections at elevated temperatures under the loading conditions of EOF, ETF and EL. The assessments indicated that the predictions by using the new method were generally conservative and reliable.
Highlights Web crippling of lean duplex stainless steel sections at elevated temperatures was studied. Three different concentrated end bearing loads were considered. 210 specimens covered web slenderness ratio from 21 to 145 was investigated. Current codified web crippling design provisions were assessed. Direct strength method was modified for the design at elevated temperatures.
Design of lean duplex stainless steel tubular sections subjected to concentrated end bearing loads at elevated temperatures
https://orcid.org/0000-0002-2295-8725
https://orcid.org/0000-0001-9421-738X
Abstract Design rules for web crippling of stainless steel tubular sections at elevated temperatures are currently unavailable. In this study, non-linear finite element models (FEMs) were developed for the web crippling of cold-formed lean duplex stainless steel (CFLDSS) square and rectangular hollow sections under the concentrated end bearing loads, namely the loading conditions of End-One-Flange (EOF), End-Two-Flange (ETF) and End Loading (EL). After successful validation of the FEMs, an extensive parametric study of 210 CFLDSS tubular sections at elevated temperatures (up to 950 °C) was performed. The appropriateness of the web crippling design rules in the current international specifications and literature was examined by comparing their ultimate strength predictions with those obtained from the parametric study. The material properties at room (ambient) temperature condition were substituted by those at elevated temperatures. It was found that the predictions by the current design specifications and the literature were generally unconservative and not reliable, while the European Code provided reliable but generally very conservative predictions. A new design method by using the Direct Strength Method was proposed for the web crippling of CFLDSS tubular sections at elevated temperatures under the loading conditions of EOF, ETF and EL. The assessments indicated that the predictions by using the new method were generally conservative and reliable.
Highlights Web crippling of lean duplex stainless steel sections at elevated temperatures was studied. Three different concentrated end bearing loads were considered. 210 specimens covered web slenderness ratio from 21 to 145 was investigated. Current codified web crippling design provisions were assessed. Direct strength method was modified for the design at elevated temperatures.
Design of lean duplex stainless steel tubular sections subjected to concentrated end bearing loads at elevated temperatures
https://orcid.org/0000-0002-2295-8725
https://orcid.org/0000-0001-9421-738X
Abstract Design rules for web crippling of stainless steel tubular sections at elevated temperatures are currently unavailable. In this study, non-linear finite element models (FEMs) were developed for the web crippling of cold-formed lean duplex stainless steel (CFLDSS) square and rectangular hollow sections under the concentrated end bearing loads, namely the loading conditions of End-One-Flange (EOF), End-Two-Flange (ETF) and End Loading (EL). After successful validation of the FEMs, an extensive parametric study of 210 CFLDSS tubular sections at elevated temperatures (up to 950 °C) was performed. The appropriateness of the web crippling design rules in the current international specifications and literature was examined by comparing their ultimate strength predictions with those obtained from the parametric study. The material properties at room (ambient) temperature condition were substituted by those at elevated temperatures. It was found that the predictions by the current design specifications and the literature were generally unconservative and not reliable, while the European Code provided reliable but generally very conservative predictions. A new design method by using the Direct Strength Method was proposed for the web crippling of CFLDSS tubular sections at elevated temperatures under the loading conditions of EOF, ETF and EL. The assessments indicated that the predictions by using the new method were generally conservative and reliable.
Highlights Web crippling of lean duplex stainless steel sections at elevated temperatures was studied. Three different concentrated end bearing loads were considered. 210 specimens covered web slenderness ratio from 21 to 145 was investigated. Current codified web crippling design provisions were assessed. Direct strength method was modified for the design at elevated temperatures.
Design of lean duplex stainless steel tubular sections subjected to concentrated end bearing loads at elevated temperatures
Cai, Yancheng (author) / Zhou, Feng (author) / Wang, Liping (author) / Young, Ben (author)
Thin-Walled Structures ; 160
2020-11-10
Article (Journal)
Electronic Resource
English
Design of ferritic stainless steel tubular sections subjected to concentrated bearing load
| British Library Conference Proceedings | 2018