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Sponsor: AISC

PI: Patricia Clayton

Structural fuses are used in seismic design to concentrate yielding in the ductile members of a seismic system. To improve seismic resilience, these fuses can be designed to be easily replaced following an earthquake via bolted connections. Fuse-type connections for steel moment-resisting frames (MRFs) provide replaceable ductile elements in the connection that can be designed to yield at specific flexural demands, while the surrounding beams and columns remain elastic, allowing for more resilient and repairable design options. This type of fuse connection does not require that the connections be capacity designed for the expected flexural demands from the beams, whose section sizes are often governed by drift limits. While these fuse-type connections have been shown to have similar ductility capacity to conventional moment-resisting connections, questions have been raised about the ability of MRFs employing fuse-type connections to provide the same level of life safety performance as MRFs with conventional connections that may have significantly higher overstrength. This research project aims at addressing these concerns by using the FEMA P-695 framework to investigate the collapse performance of MRFs with fuse-type connections. This research project will also investigate alternative fuse connection concepts that can be employed in performance-based seismic design frameworks to provide enhanced performance at different seismic hazard levels.