عنوان مقاله [English]
This paper presents a study on moment connection of I-beam to built-up box column using flange plates. In this type of connection, the beam flanges are not connected to the column flange directly. The flange plates are fillet welded to the beam top and bottom flanges and CJP groove welded to the column flange. To investigate the cyclic behavior of the connection, nonlinear finite element program ABAQUS 6.8.1 is used. Results show that stress in the groove weld between beam flange plates and column flange is high which results in potential of brittle fracture and non-ductile behavior of the connection. To reduce the stress in the groove weld, single and double trapezoidal rib plates are installed on each beam flange plates. The rib plates are groove welded to the column flange and fillet welded to beam flange plates. Results of finite element analysis show that use of the rib plates although have no significant effect on global behavior of the connection but they result in reduction in the stress in the groove weld between beam flange plates and column flange.