incremental dynamic analysis of mid-rise buildings with buckling restrained brace frame system under pulse-like near-fault ground motions

Buckling restrained braced frames (brbfs) are frequently utilized as seismic force-resisting systems due to their considerable ductility and energy dissipation capacity. while brbfs have shown reliable seismic performance in extensive experimental and numerical studies under far-field ground motions, research on their performance under near-fault ground motions is limited. near-fault ground motions, characterized by short-duration pulses with high amplitudes, impose greater seismic demands on structures. this study conducts incremental dynamic analysis (ida) on two 8- and 12-story brbf structures under far-fault and near-fault ground motions. comparison involves confidence intervals of average ida curves rather than direct curve comparisons due to record selection uncertainty. at 99% confidence, no significant differences are observed. at 95% confidence, a minor difference is noted, while at 90%, substantial differences emerge, with confidence intervals indicating about a 25% difference for the 8-story and 75% for the 12-story structure. residual drift comparisons show no significant difference at 99% confidence, a slight difference for the 12-story structure at 95%, and significant differences for both structures at 90% confidence. this suggests the importance of considering near-fault ground motions in assessing brbf seismic performance, particularly for taller structures.