Behaviour and design of duplex stainless steel CHS stub columns at elevated temperature. Issue 2 (1st September 2021)

• Record Type: Journal Article
• Authors: Mohammed, Asif; Cashell, Katherine A.
• Is Part Of: Ce/papers. Volume 4:Issue 2/4(2021)
• Page Start: 1663
• Page End: 1670
• Publication Date: 2021-09-01
• Subjects: Continuous strength method -- circular hollow sections -- cross‐section classification -- cross‐section resistance -- local buckling -- stainless steel -- strain hardening and duplex; Civil engineering -- Periodicals; 624
• DOI: 10.1002/cepa.1471
• Languages: English
• ISSNs: 2509-7075

Abstract

Abstract: This paper investigates the behaviour and design of duplex stainless steel stub columns with a circular hollow cross‐section (CHS) at elevated temperature. A numerical model is developed to supplement the limited number of test results available in the literature. Following validation, the numerical approach is employed to gain an understanding of the critical behavioural characteristics which have not previously been studied. In addition, the paper considers and extends the continuous strength method (CSM) to include duplex stainless steel for CHS stub columns in fire. This approach employs a base curve linking the cross‐sectional resistance to the deformation capacity and is implemented herein using an elastic, linear hardening material model. The cross‐sectional resistances obtained from the CSM are compared with those from the numerical analysis, as well as with the standardised procedures in the European, American and Australia/New Zealand design standards. It is demonstrated that the proposed design method can lead to more accurate and less scattered strength predictions compared with current design codes.