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The main purpose of this paper is to study the fire resistance and failure mode of the square hollow section (SHS) T-joint at elevated temperatures under axial compression. Experimental tests on two full-scale square tubular T-joints with different geometries are carried out. The specimens are set to sustain constant compressive loading at brace end during the heating process. The environmental temperature around the specimens is in accordance with ISO 834 heating curve. The temperature on the tube surface and the deforming process of the two T-joints are both measured till the failure of the specimens. The experimental results show that the failure process of both specimens includes three stages. The final failure mode of both specimens is local buckling on the chord surface near the brace/chord intersection while there is no clear global deformation on the T-joint surfaces. In comparison, the T-joint specimen with smaller brace-to-chord diameter ratio has a more gradual and longer time of deforming process before final failure, which shows the geometry of the tubular joint has an effect on the failure mechanism.

EXPERIMENTAL STUDY ON FIRE RESISTANCE OF SQUARE HOLLOW SECTION (SHS) TUBULAR T-JOINT UNDER AXIAL COMPRESSION