08.15: Axial behaviour of concrete filled lean duplex stainless steel square hollow sections

Abstract

ABSTRACTStainless steel hollow sections have been used in building constructions for a number of years due to their durability and superior mechanical properties. However, they are less favourable than the carbon steel counterpart owing to their relatively high cost. A new, low nickel content stainless steel (EN 1.4162) or commonly referred as ‘lean duplex’ has been developed; which has over two times the strength of the more familiar austenitic stainless steel but at approximately half the cost. This more economical alternative would definitely be an attractive option to the construction industry. This paper presents the behaviour of axially loaded concrete filled composite stub columns with lean duplex stainless square hollow sections. A series of tests was performed to consider the behaviour of short composite stainless steel columns under axial compressive loading, covering lean duplex stainless steel square hollow sections filled with normal to high strength concrete. Based on the experimental studies, a modified equation based on the current Eurocode 4 on steel concrete composite structures is proposed.