Behaviour of CFDST chord to CHS brace composite K-joints: Experiments. (August 2017)

• Record Type: Journal Article
• Authors: Hou, Chao; Han, Lin-Hai; Mu, Ting-Min
• Is Part Of: Journal of constructional steel research. Volume 135(2017)
• Page Start: 97
• Page End: 109
• Publication Date: 2017-08
• Subjects: Composite K-joints -- Concrete filled double-skin steel tube (CFDST) -- Static loading -- Joint behaviour -- Strength prediction; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2017.04.015
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: Concrete filled double-skin steel tubular (CFDST) members have a large potential to be used in trusses, bridges and lattice structures. Previous research work has focused on the structural performance of individual CFDST components whilst there is a lack of understanding on the behaviour of typical connections formed by such composite members. This paper intends to fill the knowledge gap in this area. A total of 20 K-joints with circular CFDST chords and circular hollow section (CHS) braces were tested under two typical sets of boundary conditions. Effects of important parameters were investigated based on the test results, including brace to chord diameter ratio ( β ), chord hollow ratio ( χ ) and preloads on the chord. Typical failure modes and load-deformation relations were investigated, in-depth study on the interactions between materials and the load-transfer mechanism were conducted, simplified strength-prediction method for this new type of composite joints was also proposed. Highlights: We presented experimental investigations on CFDST K-joints under two typical sets of loading conditions. We conducted analysis on the structural performance of CFDST K-joints. We proposed strength calculating method of CFDST K-joints.