A unified interaction equation for strength and global stability of solid and hollow concrete-filled steel tube columns under room and elevated temperatures. (September 2018)

• Record Type: Journal Article
• Authors: Yu, Min; Xu, Haoming; Ye, Jianqiao; Chi, Yin
• Is Part Of: Journal of constructional steel research. Volume 148(2018)
• Page Start: 304
• Page End: 313
• Publication Date: 2018-09
• Subjects: Concrete-filled steel tube (CFST) -- Unified interaction formula -- Combined load -- Average temperature -- Fire resistance; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2018.05.026
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: On the basis of plastic limit analysis, this paper proposes a novel, simple and unified interaction equation (N-M) for Concrete-filled Steel Tube (CFST) columns subjected to combined compression and bending. A unique feature of the new N-M equation is that the single equation is valid for a range of columns that can be solid, hollow, circular, polygonal, short or long. The single equation can also apply to columns under both room and elevated temperatures. Validations against independent laboratory test, analytical and numerical results are carried out to assess the accuracy and applicability of the equation. The new equation agrees well with most of the results used in the comparisons. It can be concluded that the simple and unified equation can be used in practical design with sufficient accuracy. Highlights: A unified N-M interaction formula for solid and hollow concrete-filled steel tubes was proposed. The formula is applicable to columns subject to both room and elevated temperature. The equations can be applied to both circular and polygonal sections. The columns can also be short and long.