Seismic performance and collapse assessment of a steel boundary frame with non-gapping beam-to-column rocking connections with buckling-restrained brace structural fuses

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Department of Civil, Environmental, and Geospatial Engineering


Towards a more seismically resilient Buckling Restrained Braced Frame (BRBF) alternative, the results of an analytical and numerical study on a newly proposed Seismic Force-Resisting System (SFRS) are presented, referred to as the NewZ-BREAKSS Buckling Restrained Braced Frame (NZ-BRBF). This SFRS leverages the energy dissipating benefits of Buckling Restrained Braces (BRBs) as replaceable structural fuses, combined with a damage-free post-tensioned steel boundary frame that provides post-yield stiffness and eliminates undesired diaphragm interaction observed in other steel boundary frames with beam-to-column rocking connections. First, basic kinematics of the proposed NZ-BRBF system is presented to inform fundamental behavior. Next, the results of a nonlinear response history analysis numerical investigation are presented that provides insight on the seismic performance of the SFRS. Finally, the results of a numerical collapse study, evaluated using the FEMA P-695 methodology as a guiding framework, is presented, establishing preliminary seismic performance factors.

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Journal of Constructional Steel Research