The United States Resilience Council (USRC) seismic rating can be used to communicate the results of an engineering-based evaluation to the relevant building stakeholders. Star ratings are provided for three separate dimensions: safety, damage, and recovery. The safety rating is described in terms of the potential for earthquake-related injuries, loss of life and the ability to evacuate the building following a seismic event. The damage rating is assigned based on the estimated cost of repairing earthquake-related damage and the time it takes the owner to regain use of the building for its primary intended function is used as the basis for the recovery rating.
This presentation will cover the processes, models, and tools needed to perform a USRC rating using nonlinear response analyses and FEMA P-58 assessment. Guidelines will be presented for using nonlinear response history analyses to obtain the necessary engineering demand parameters. An overview of the FEMA P-58 methodology will be presented, which is used to obtain estimates of fatalities, damage, economic losses, and recovery times conditioned on a specific ground motion intensity (e.g. DBE level shaking). The USRC seismic rating criteria will be discussed in detail. The presentation will conclude with a demonstration of the overall procedure for a steel special moment frame building using Perform 3D as the structural analysis tool and the Seismic Performance Prediction Program (SP3) for the FEMA P-58 assessment.