Comportamiento experimental de conexiones soldadas entre tubos cuadrados de acero conformados por perfiles G de 60X30X10X2 y 80X40X15X3 mm sometidas a carga monotónica

Abstract

The objective of this research was to analyze, through six tests, the elastoplastic behavior of welded connections with square-shaped steel tubes made up of 60x30x2 and 80x40x3mm G profiles, subjected to monotonic loading by experimental analysis of the distortion of the cross-section geometry of the beam-column joint elements. It was necessary to design and manufacture a support frame with a universal machine load application system in the materials mechanics laboratory of the Salesian Polytechnic University (UPS). Each test consisted of imposing progressive loading on the upper connection of the gantry, to measure in displacements and distortion of the geometry of the connecting elements column beam of the lower connection. The results showed that the connection without reinforcement presents a local fault generated by excessively concentrated axial force (punching) that transmits the beam to the column, which induces a decrease in the experimental collapse load of the gantry by approximately 12.82% with respect to the theory. In addition, it distorts the cross-section of the column in the welded joint and the formation of the plastic kneecap in said element. The plates (stirrups) installed in the column of the welded joint avoids the failure by concentrated axial force (punching) in the column and distorts the beam section by forming the plastic ball joint in the element in question.