Numerical Analysis of a Novel Assembled Joint Connecting FCSRC Columns and RC Beams

FRP-confined steel-reinforced concrete (FCSRC) columns is a new type of composite structural member with excellent performance, which has been widely studied in recent years. However, few studies on its connection with other structural members have been reported, which limits the application of FCSRC columns in structures. For this reason, a novel assembled joint that can connect FCSRC columns and reinforced concrete (RC) beams was proposed and its mechanical performance was investigated by finite element analysis (FEA). The results showed that the FEA model provided can reasonably reflect the failure modes and load–displacement curves of test specimens. Specifically, the initial stiffness and peak load of the specimens obtained from the finite element analysis differed by no more than 10% and 5%, respectively, compared to the test. Increasing the thickness of the steel tube and the external stiffening ring had a significant effect on the node shear stiffness, which can reach 73.1% and 60.6%, respectively. The increase of axial load ratio can also increase the shear stiffness of the joint, but the increment was not significant. In addition, the results of this paper can provide a rational reference for the subsequent study of parametric analysis and design methods.