This paper presents the results of full-scale physical tests on a recently developed cold-formed steel (CFS) semi-rigid moment-resisting connection infilled with rubberised concrete (RuC) for seismic application. The connection comprises side-plates attached to both sides of built-up tubular CFS beam and column sections through either screwed or welded connections. The tests were performed on both bare steel and CFS-RuC composite connections under cyclic loading for comparison purposes. The predominant modes of failure are beam local buckling and side plate plasticity in the bare steel connections and screw shear failure in the composite connections. The results show that the composite connection typically reaches 45% higher strength and 21% greater energy dissipation capacity than the bare steel connection both having 24 screw arrays. These indicate the beneficial effects of the infill RuC in prevention of the beam local buckling in connections with identical connection configuration. The energy dissipation capacity of the bare steel connection having 36 screw arrays, however, was 70% greater than that of the composite connection with 24 screw arrays. This reflects side plate plasticity being a more effective energy dissipation mechanism than the other identified mechanisms.
Bibliographical noteThis research was supported by the Royal Academy of Engineering Frontiers of Development Seed Funding scheme (FoD2021\4\26). Lab- oratory assistance from MSc student Callum Clark and laboratory and workshop technicians at the University of Aberdeen was much appre- ciated. The fourth author is grateful to the Ministry of the education of the republic of Azerbaijan for their financial support.
Data Availability StatementData will be made available on request.
- Cold-formed steel
- Moment-resisting connections
- Semi-rigid joints
- Cyclic loading