Vulnerability Study of Existing Office Building Before and After Rehabilitation Using Fragility Curve

Abstract Padang, located in West Sumatra, is an earthquake-prone area, with a major event occurring in 2009 that damaged many important buildings. An existing building was impacted by the earthquake, resulting in cracks and other damages. Subsequently, the building was rehabilitated to enhance its structural strength through jacketing. This study compares the building’s fragility curves before and after rehabilitation using the HAZUS standard and licensed Seismostruct software. The results show that, prior to rehabilitation, the building was vulnerable to damage due to earthquake. After rehabilitation, the structural strength improved more significantly, reducing damage levels from moderate to minor. Given the high seismic risk in Padang, it is crucial that building structures are designed with optimal resilience. The development of an analytical fragility curve is proposed for a more in-depth evaluation of building performance against future earthquakes, facilitating the identification of damage levels and enabling timely preventive and corrective measures.