Numerical Study of Unstiffened Cold-Formed Steel Sections Moment Connection

Document Type : Original Article

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1 structural engineering department , faculty of engineering ,zagazig university,zagazig

2 structural engineering department ,faculty of engineering ,zagazig university, zagazig

Abstract

Cold-Formed Steel sections are commonly used in residential and commercial buildings as purlins, side girts, portal frames and moment resisting frames. The bolted moment connections can be used connect the different structural components of these buildings together. These connections allowing the transfer of the internal forces of the structures such as axial forces, shear forces, bending moments and torsion. The main objective of this paper is to study numerically the behavior of the apex bolted moment connection for cold formed sections. The deflection and the stress distribution at critical sections for unstiffened 2C (double back-to-back) CFS were investigated for two cases, in the first case connecting single gusset plate was used, while in the second case two connecting double gusset plates with cutting compression flange were used. A finite element modeling was developed by using the ANSYS workbench v19.2 finite element code to simulate the apex connection of cold-formed steel sections. The considered beams had span lengths of 4000 mm with nominal web depths of 150 mm. and wall thickness 2.0 mm. A validation for the numerical model with experimental results is executed. Parametric study concerning the connecting plate thickness, no of connecting bolts used and different bolts pretension forces are presented. Based on this analysis the deflections and ultimate failure load and failure modes of specimens were studied and presented.

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