Behavior of Steel Moment Frames Using Top-and-Seat Angle Connections under Various Column-Removal Scenarios

Top-and-seat angle connections are a conventional type of steel moment connection. However, their capacity in accommodating columns loss is rarely studied. In this study, five multistory subframes using top-and-seat were fabricated and tested to investigate performance while subjected various column-removal scenarios, including: (1) middle column loss, (2) penultimate (3) corner loss. Moreover, the effects thickness on load resistance quantified. The test results indicated that load-resisting increased significantly with increase thickness. both removal catenary action was developed frames. It also noticed flexural dominated mechanism frames under scenario. For beams different stories, similar developed. first story able develop larger than second story. worth noting that, for missing scenario, Vierendeel helps enhance significantly.