Collapse Assessment of Mid-Rise RC Dual Wall-Frame Buildings Subjected to Subduction Earthquakes

In Chile, office buildings are typically reinforced concrete (RC) structures whose lateral load-resisting system comprises core structural walls and perimeter moment frames (i.e., dual wall-frame system). the last 20 years, nearly 800 new have been built in country roughly 70% of them less than ten stories. Although seismic performance these was deemed satisfactory previous earthquakes, their actual collapse potential is indeed unknown. this study, Chilean code-conforming mid-rise RC assessed considering different hazard levels high moderate activity) soil types stiff moderately stiff). Following FEMA P-58 methodology, 3D nonlinear models four representative archetypes were subjected to sets subduction ground motions. Incremental dynamic analysis used develop fragilities. The results indicate that comply with ‘life safety’ risk level defined ASCE 7, which consistent observed behavior recent mega-earthquakes Chile. However, not uniform. Differences probabilities significant, might revisions current design code be necessary.