Bearing Performance of Aluminum Alloy Gusset Joints After Fire

Abstract:

Research on the over-fire performance of aluminum alloy gusset （AAG） joints can provide a basis for evaluating the bearing performance of aluminum alloy reticulated shells after fire. The tensile tests of 6061-T6 aluminum alloy after fire were conducted and the formula of reduction coefficient of mechanical property after fire was given. The bearing performance tests of 12 pieces of 6061-T6 aluminum alloy gusset joints after fire were performed. The bending capacity and the possible failure modes of aluminum alloy gusset joints after fire were presented. The test results indicate that the material property of aluminum alloy and the mechanical property of aluminum alloy gusset joints show a three-fold trend with the change of fire temperature. Parametric analysis was carried out based on the numerical model to study the influence of material properties， over-fire temperature， and size specifications on the bearing performance of aluminum alloy gusset joints after fire. Finally， through numerical fitting， the calculation formula of the bending stiffness and the bearing capacity of aluminum alloy gusset joints after fire and the four-line model of moment-rotation curve were obtained.