Abstract:Considering the thickness of rib, eccentricity and the type of plate, four different forms of prefabricated steel corbels were tested for the mechanical resistance.The load-deformation curve, stress distribution,ultimate strength of steel corbels and failure modes of the specimens were recorded and presented,and a finite element model was established to analyze the load deformation relationship and the moment rotation relationship.The results show that the steel corbel joint is semi-rigid. There are two failure modes of corbel. When the anchor plate has no support protection, the anchor plate will buckle before the bracket reaches the ultimate bearing capacity; when the anchor plate is supported, the ultimate bearing capacity of the bracket depends on the shear strength of the bolt.From the comparison of stress distribution, it is found that the stress concentration occurs at the abrupt change of structural stiffness.The quality of weld joint and the material of bolt are the key to stress. Improving them will greatly improve the bearing capacity of the joint.The larger the thickness of steel corbel rib, the greater the ultimate bearing capacity; the smaller the eccentricity, the greater the ultimate bearing capacity.The initial stiffness of the joints increases slightly with the thickeness of the rib,but the eccentricity does not exert an obvious effect on the initial rotational stiffness of joints.If the clearance between the side panel and the column wall is too large,then the stiffness will decrease apparently,thus the fabrication error should be reduced as much as possible.