Experimental investigation on lightweight concrete-filled cold-formed elliptical hollow section stub columns. (December 2015)

• Record Type: Journal Article
• Authors: Chan, Tak-Ming; Huai, Yun-Mei; Wang, Wei
• Is Part Of: Journal of constructional steel research. Volume 115(2015:Dec.)
• Page Start: 434
• Page End: 444
• Publication Date: 2015-12
• Subjects: Cold-formed -- Concrete-filled -- Elliptical hollow section -- Lightweight concrete -- Stub column; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2015.08.029
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: This paper presents an experimental investigation on lightweight concrete-filled circular and elliptical hollow sections under axial compression at cross-section level. The elliptical hollow section (EHS) was cold-formed from the hot-rolled circular hollow section (CHS). Experimental findings, including failure mode, load-deformation history and load carrying capacity, from the 24 stub column tests were compared and reported. Comparisons in particular between the parent hot-rolled CHS and cold-formed EHS were made and stub column results have indicated the cold-forming process decreases both the load carrying capacity and the ductility. Design rules based on European standards were also assessed and assessments have shown that the existing rules can be adopted for the design of lightweight concrete-filled hot-rolled CHS while a simple superposition model can be used for the design of lightweight concrete-filled cold-formed EHS. Highlights: Lightweight concrete-filled (CF) hot-rolled CHS and cold-formed EHS have been investigated. 24 stub column test results on hollow and lightweight CF tubes were analyzed. Cold-formed EHS showed lower strength and ductility than their parent hot-rolled CHS counterparts. Design equations based on EC 4 can be adopted for lightweight CF CHS. Simple superposition expression based on EC 4 can be adopted for lightweight CF EHS.