Experimental study on hysteretic performance of aluminum alloy T-shaped beam-column joints after exposure to high temperature
In order to study the hysteretic performance of the aluminum alloy T-shaped beam-column joints after exposure to high temperature.Cyclic load tests of four T-joints at different temperatures and temperature exposure times were designed and carried out.The experimental phenomena and modes of failure were recorded.The temperature rise curve of specimen,hysteretic curve,skeleton curve,ductility index,bearing capacity and stiffness degradation curve were obtained.The failure mechanism,bearing capacity and seismic performance of the joint were analyzed.The experimental results indicate that the failure modes of the specimens under cyclic loading are bending shear failure of the gusset plate,and the hysteresis curve is not saturated.The ultimate bearing capacity of specimens after exposure to high temperature decreases with the increase of exposure time.Compared with the aluminum alloy T-joint specimens at room temperature,stiffness degradation and ductility of specimens after exposure to high temperature increase.Bolt slip increases energy dissipation of specimens,but the friction has an adverse effect on the specimen at room temperature at the beginning of the slip stage.
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