Earthquake-induced loss assessment of steel frame buildings with buckling-restrained braced frames subjected to spectrally equivalent long- and short-duration ground motions

A comprehensive assessment of earthquake-induced losses in steel frame buildings equipped with buckling-restrained braced frames (BRBFs) subjected to diverse seismic hazards is crucial for enhancing seismic resilience. This research investigates the structural and economic implications of ground motion duration on BRBF buildings by comparing spectrally equivalent long- and short-duration far-field ground motion suites, with the FEMA P695 far-field ground motion suite employed as a benchmark representing conventionally adopted record sets. Nonlinear dynamic analyses are performed on steel archetype BRBF buildings to evaluate their seismic response, including peak story drift ratios, residual story drift ratios, and peak floor accelerations, which serve as the engineering demand parameters for the component-level fragility assessment. The findings are integrated into a probabilistic loss assessment framework to quantify expected seismic economic losses associated with different seismic scenarios. Results reveal that ground motion duration substantially influences the collapse fragility and earthquake-induced economic losses of BRBF buildings, with the duration effects becoming increasingly pronounced for taller archetypes, providing critical insights for resilience-based design and decision-making. The study highlights the importance of incorporating hazard-specific considerations into performance-based engineering to enhance the seismic resilience of BRBF-equipped buildings.