Behaviour of rectangular gusset plate with angle cleat connections for cold-formed steel section

Abstract

Cold-formed steel (CFS) members designed with proper stiffener can significantly increase the loading capacity of the connected member even though they are thin and slender. Design recommendations of connections especially for CFS sections are mostly related to the load-carrying capacities of individual fasteners such as bolts, screws, and rivets. The proposed bolted top-seat flange cleat joint in this paper should be able to categorize as semi-rigid that can further enhance the use of CFS in structural steel. This paper aims to investigate the behaviour of cold-formed steel section with gusset plate integrated with angle cleats. The full-scale isolated joint test was conducted on three specimens where the size of column size is C30024, and the size of beams is C20024, C25024, and C30024. All sections are 2.4mm thick. The connections were stiffened with a rectangular gusset plate of 10mm thick and angle cleat of 6 mm thick, respectively. The result of the test showed that the moment resistance (Mj) of the connection for beam sections C20024, C25024 and C30024 were 45.3 kNm, 48,8 kNm, and 52.5 kNm respectively. The initial stiffness (Sj,ini) of the connections for beam section C20024, C25024 and C30024 were 510 kNm/rad, 650 kNm/rad and 610 kNm/rad respectively. The experimental results showed that the ratio of the moment resistance ranged from 1.00 to 1.16, and the ratio of initial stiffness ranged 1.00 to 1.35 as compared to the numerical analysis adopted from EC3 code.

Effect of bottom flange cleat on integrated precast slab and column panel using cold-formed steel

“…The experimental results show that the beam depth should be limited to obtain ductile joint behaviour. The study was continued with the same type of connection, but with the addition of top angle and seat angle with a thickness of 6 mm Aminuddin et al [7]. The comparison of the two specimens shows that the influence of the top and seat angle could increase the moment capacity and stiffness of the connection.…”

“…Firdaus et al [8] continued the research on noncomposite joints that Aminuddin had done. The beam and column dimensions are the same as previous studies [6,7], but the haunched gusset plate was selected. This shape was chosen to avoid premature buckling of the gusset plate.…”

“…Both composite and non-composite had an addition to the flange-cleat connection [2,5,7]. The flangecleat connection is related to fast installation and lack of expensive welding processes.…”

Moment capacity of connection with the additional top and seat angles to slab and column panel of cold-formed steel section

“…similar gusset plate from his previous research [4]. The other gusset plate shapes were haunched gusset plate [5] and T-Shaped gusset plate [7].…”

“…There are additional flange cleats in both studies of non-composite and composite specimens of CFS [4,8,11]. The purpose of additional flange-cleat is related to quick and easy installation and avoids the welding process, which is expensive.…”