Structural Performance of Cold Formed Section Beam to Column bolted Connections
Hanna, Maged Tawfick.
Massoud, Ahmed Mohaed
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The semi-rigid nature of the cold formed section beam to column connections is primarily due to the distortion, tearing of column section plates, and distortion of beams end sections. Stability of such structures usually depends signif icantly on the behavior of these connections. In this study, Nonlinear finite element model were done for two cold formed section assemblies to evaluate their rotational stiffness and capacity. In the first assembly, both the beam and column having a back to back lipped sigma cold formed sections. However, in the second assembly, lipped back to back channel section connected to box column section. The beams and columns are connected together using gusset plate or gusset plate inaddition to angles between the beam and column flanges. In the model, the column ends were fixed, and the beam cantilever end allowed to move vertically. The out of plane deformation were prevented by means of lateral restraints attached to the specimens at the tip of the horizontal beam below the load application, and at the mid span of the cantilever beam. The cold-formed sections were modeled using shell elements while the connecting fasteners are modeled using contact elements. The developed model allows for the geometric as well as the material nonlinear behaviour of the assembly. An extended parametric study was then carried out covering the different parameters such as thickness of the main sections and the connecting elements. Finally, the numerical M- curves were drawn and the different modes of failure were explored. Results revel that the connection could reach the flexural capacity of the connecting elements but with large deformations.