Seismic performance of prefabricated joint with double L-shaped stiffener

The research group proposed a prefabricated joint with a double L-shaped stiffener (DLS joint) for light steel composite frame structures. The DLS joint boasts simplicity in construction, allowing for quick connection of prefabricated beams and columns through bolts. To investigate the seismic performance of the DLS joint, experimental research and numerical simulations were conducted. Based on the accuracy of the numerical model, the effects of stiffener thickness, stiffener height, vertical plate and horizontal plate thickness of the L-shaped connecting plate, and bolt pre-tightening force on the seismic performance of the DLS joint were studied. The results demonstrate that the DLS joint exhibits good seismic performance. Increasing stiffener thickness, stiffener height, vertical plate, and horizontal plate thickness enhances the flexural capacity and flexural stiffness of the DLS joint. Stiffener height notably influences the mechanical performance of the joint, whereas the pre-tightening force of bolts has minimal impact. Different parameters should be designed and matched reasonably according to construction convenience, economy, and the mechanical performance of beam and column members.