PORTAL FRAMES WITH I-BEAM TO RHS-COLUMN JOINTS

Resumo

This paper analyses welded joints in portal frames with I-beams and rectangular hollow
section columns. The study of joints is essential to the understanding of the structural behavior of portal
frames, and the analysis of its stiffness enables a better understanding of moment transmission between
tubular columns and I-beams, besides enabling the joint classification. Through numerical analysis using
a commercial software, the representation of the models was implemented in finite elements, with
subsequent displacement simulation. The slenderness of the tubular columns and the beam-to-column
width ratio were varied. The moment-rotation curves for each joint in a portal frame were presented,
and the influence of the parameters involved was presented graphically, where it was possible to
visualize yielding in some regions. Plastification of the column face occurred in the cases, while all
connections were classified as semi-rigid. Arrangements with different beam lengths were made, where
it was possible to observe its influence on the joint classification.