Finite element study on axially loaded reinforced Square Hollow Section T-joints at elevated temperatures

This study numerically investigates the elevated temperature resistance of collar plate and doubler plate reinforced Square Hollow Section (SHS) T-joints subjected to brace axial compressive load. The extensive numerical simulations were performed to examine the effects of the geometrical parameters of main members and reinforcing plate on the fire resistance of reinforced SHS T-joints after verification of the numerical models based on the available test results. The corresponding unreinforced joints were also analysed as reference resistance at five different temperature levels (20 degrees C, 400 degrees C, 500 degrees C, 600 degrees C, and 700 degrees C).