Progressive collapse behaviour of endplate connections to cold-formed tubular column with novel Slip-Critical Blind Bolts. (October 2018)

• Record Type: Journal Article
• Authors: Wang, Wei; Li, Ling; Chen, Dabiao
• Is Part Of: Thin-walled structures. Volume 131(2018)
• Page Start: 404
• Page End: 416
• Publication Date: 2018-10
• Subjects: Slip-Critical Blind Bolt -- Square hollow section column -- Moment connection -- Extended endplate connection -- Progressive collapse -- Catenary mechanism; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2018.07.012
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: A novel blind bolt, named Slip-Critical Blind Bolt (SCBB), was recently invented at Tongji University to be used as slip-critical high strength bolt for moment connections with handy installation from outside of tubular column. This paper applied SCBBs in extended endplate connections to cold-formed Square Hollow Section (SHS) columns, and investigated this application in the beam-to-column assembly against progressive collapse. The performance of SCBBs at connection regions was evaluated in four full-scale specimens with different configurations. Four distinct failure modes were identified, including fracture at beam section, pull-out of bolts from column wall, plastic deformation of endplates and welded bottom flange fracture forcing the reinforcing component to work. Throughout the damage evolution, the SCBBs performed satisfactorily by clamping the connected plates firmly without slip occurring at the plate interface, showing a good mechanical property as being slip-critical high strength bolts. Under the progressive collapse scenario, SCBBs maintained the integrity of the blind bolted connection, thus facilitated the assembly to effectively develop the catenary mechanism which provided significant vertical resistance under large deflection. The considerable potential of SCBB to be applied into the blind bolted moment connections against progressive collapse and its effectiveness were further verified by comparison between the test specimens and other published moment-resisting beam-to-column assemblies. Highlights: Novel Slip-Critical Blind Bolts (SCBBs) applied in extended endplate connections. Four full-scale tests on progressive collapse behaviour of endplate connections. Satisfactory mechanical property of SCBB as slip-critical high strength bolt. Comparison of four failure modes for different connection configurations. Effectiveness of SCBB in blind bolted moment connection against progressive collapse.