Through the analysis of various beam-column connected joints,this study reveals that the new connection method, featuring a lower bolted-through diaphragm and an upper welded external plate, enhances the catenary mechanism and improves the resistance to continuous collapse. The analysis employs ABAQUS software to conduct a comprehensive examination of failure modes, load-displacement curves, and resistance mechanisms under varying span-to-height ratios, span ratios and locally weakened sections of this joint. This study introduces a novel joint design aimed at enhancing collapse behavior and establishing a foundation for the design of structures with improved resistance to continuous collapse.