Performance of Novel U-Connector in CFS Truss-to-Column Bolted Connection under Axial Force

Abstract

This paper presents an experimental and numerical investigation of the tensile and compressive behaviour of a novel U-connector in the cold-formed steel (CFS) truss-to-column connection. Tensile tests were performed on 12 specimens representing the tension chords of the trusses in the connection. The results were used to validate a finite element model. The validated model was then subjected to both compressive and tensile loads, which revealed low stiffness in both the compressive and tensile components of the proposed connection. An optimisation of the geometry by using one long nut instead of two nuts was carried out to improve the behaviour and stiffness of the connection. The optimised results were compared with both experimental and numerical data, and conclusions were drawn regarding the effectiveness of the components in the proposed connection. The use of long-nut optimisation in the tension and compression components of the proposed connection shows a significant increase in load-bearing capacity, which makes it very promising for future applications in CFS truss-to-column connections. However, further validation through experimental testing is required to confirm the effectiveness and reliability of the connection in full-scale structures.

Investigating the Factors Influencing the Strength of Cold-Formed Steel (CFS) Sections

“…The failure mechanisms are associated with the diameter of the screws and the thickness of the steel plates [101]. Utilizing long-nut optimization in the compression and tension elements of the suggested connection results in a notable enhancement in the load-bearing capability [102]. Altering the fastener's diameter greatly impacts the initial stiffness and maximum load-bearing capability of CFS and plywood composite connections [103].…”