Abstract: In order to study the failure process, failure mode, and failure mechanism of the prefabricated steel bracket connection at high temperature, and the influence of different loads, eccentricity, rib thickness, stud diameter, and angle steel thickness on the temperature distribution, fire resistance, and displacement curve of the connection, the finite element model of prefabricated steel bracket connection is established through ABAQUS, and the accuracy of the model is verified by the test results. The results show that the average critical temperature of the side plate yield is 516.54 ℃ . The average critical temperature range of rib yield is 583.38~691.42 ℃. The average critical temperature range of rib failure is 610.85~728.96 ℃ . There are three final failure modes of connections under high temperature: 1) local buckling of the rib; 2) local bulge of the rib; 3) yield of the stud. The fire resistance of connections increases with the increase of rib thickness, the decrease of the load, and the increase of equal- leg angle steel thickness. The change of the eccentricity will change the failure mode of the ribs at high temperature.The increase in diameter of the stud will cause the temperature of the stud to increase, which harms improving the fire resistance of the connection.

Key words: prefabricated steel bracket connections, finite element analysis, failure mechanism, fire resistance, critical temperature