SEISMIC BEHAVIOR OF Z-SHAPED JOINT CONNECTING H-BEAM AND L-SHAPED CONCRETE-FILLED STEEL TUBULAR COLUMN

The seismic behavior of Z-shaped joints connecting H-section beam and L-shaped concrete-filled steel tubular column for prefabricated steel structures were studied. The ABAQUS finite element model was established and validated based on the joint test results. The load-displacement curves, skeleton curves, failure mode and performance indicators of the joint were obtained by finite element analysis. According to the finite element results, adding web splice plates, increasing the beam section height or decreasing the distances between the outmost bolts and the splicing zone center can increase the yield load and peak load of the joints. Increasing the bolt number on the flange can improve the slip load of the joint, but may reduce the ductility performance. Increasing the overhang distance of cantilever beam can improve the slip load, yield load and peak load, and reduce the required bolt number for the flange connection. Based on the finite element results, the reliability of the calculation formulas for the joint flexural capacity and ultimate flexural capacity is verified.