Análisis de la vulnerabilidad sísmica de marcos especiales a momento en edificaciones residenciales

Abstract

The seismic vulnerability of special moment frames in buildings in the city of Machala was evaluated. The first step was the selection of a comprehensive methodology to analyze the structural behavior in the face of seismic events. The evaluation was structured in two components: a qualitative one, using quick visual inspection forms (FEMA P-154 and the form adapted by the Ecuadorian Construction Standard - NEC), and a quantitative one, using a pushover analysis developed from structural models generated in SAP2000 and ETABS programs. The results obtained indicate that, according to the schedules, the building complies with the minimum score required for its typology; however, the presence of an additional floor not recorded in the original plans was identified, which requires a more detailed structural evaluation. The pushover analysis showed that the structure maintains an acceptable performance only in the face of frequent earthquakes (72-year return period), preserving habitability. However, after the 225-year earthquake, the structural demand exceeds its reserve capacity, progressively compromising functionality. It is concluded that the building requires reinforcement to ensure seismic safety in accordance with current regulations