Numerical study of CHS-SHS T-joints with chord face failure
Palavras-chave:
Hollow steel sections, T-joints, Chord face failure, Slender sections.Resumo
National and international normative prescriptions do not currently predict the design of joints with
sections containing high slenderness values. In this work, tubular T-joints containing chords with square hollow
sections and braces with circular hollow sections, which offer an easiness to the welding process, were studied
with the intention of enabling the of lighter profiles in tubular structures. A numerical model was developed using
finite elements in a commercial software (ANSYS), in which the stress distributions, the joint resistance, the failure
mode and the load-displacement behaviors were analyzed in joints with different geometric properties. An axial
compression load was applied to the brace, and the joint results were compared with the analytical results using
the equation recommended by ABNT NBR 16239:2013. Chord face failure was the failure mode found in all
profiles analyzed. It was observed that, for higher values of brace diameters and chord thicknesses, higher joint
resistance results were found. In the joints analyzed, it was observed that the current normative design equation
did not predict the joint resistance values from the numerical model with high accuracy, with a general mean ratio
of the normative joint resistance divided by the numerical joint resistance equal to 0.717.
