Functionality measures for quantification of building seismic resilience index

In recent years, the topic of resilience has caught the attention of the structural engineering community. Several approaches have been proposed through the years to quantify resilience for various infrastructure systems, but quantifying the resilience of buildings, and groups of buildings, remains challenging. Here, research was conducted to investigate the effectiveness of three different approaches proposed to quantify resilience. The proposed approaches use repair costs, occupancy levels, and asset values as the functionality measures to quantify resilience. Resilience indexes are quantified for four different example buildings using the three approaches. Performance-based assessments of the buildings are performed following the procedures of the Federal Emergency Management Agency (FEMA) P-58 document using an intensity-based method and the simplified analysis procedures. The proposed methodology by the Resilience-based Earthquake Design Initiative Rating System (REDi), to account for downtimes due to delays calculated from the FEMA P-58 assessments, are incorporated in the resilience quantification for the four example buildings. The delays due to downtimes are included in the computation of resilience index considering two scenarios based on different impeding factors. Of the approaches considered, using the occupancy level approach, with due consideration of the collapse probabilities, was deemed to provide a more meaningful expression of building resilience.