Seismic Vulnerability Assessment of an Educational Building Located at Granja St. corner Enverga St., Lucena City Philippines

The Philippines, situated within the volatile Pacific Ring of Fire is renowned for its concentration of active volcanoes on both land and sea, confronts substantial risks of extensive infrastructure damage following significant earthquakes. Among the most vulnerable are school buildings, critical for both educational and emergency purposes within society. This study centers on an educational building located at Granja St. corner Enverga St., Lucena City Philippines, situated just 64.8 km from Manila's nearest active fault line West Valley Fault and Guinayangang Fault. The construction of the Don Froilan Lopez Building in Lucena City, founded in 1997, entails a five-storey structure, the age of a structure can contribute to its susceptibility to seismic hazards. Predicting potential damages from seismic events will achieved using simulations of structural modeling for earthquakes. The proposal aims to assess seismic risk and create fragility curves for the school building based on the Capacity Spectrum Method. This entails utilizing contemporary instruments and models consistent with engineering standards. An extensive literature review was conducted to determine appropriate methodologies. Various data collection techniquest, both physical and computer-based, were employed. Software programs like SAP2000, PRISM, and Microsoft Excel were utilized for structural modeling and data computation. By utilizing SAP2000 Software for the structural modeling of an educational building and exposing it to 30 ground motion scenarios sourced from Incorporated Research Institution for Seismology Database, facilitated the generation of fragility curves. The findings obtained through Pushover Analysis, including the yield displacement and maximum displacement under gravity loads, along with the outcomes derived from the Capacity-Spectrum Method, Specifically the ductility demand, were utilized in creating the seismic gragility curve. Analysis indicated complete structural failure at a peak Ground Acceleration (PGA) of 0.58g or higher, with a 10% probability of occurrence, notably along the weaker axis ( east-west direction) during seismic activity along the x-axis of the building. Fragility curves illustrated a direct correlation between increasing PGA and heightened collapse risk of the building. When considering the Probability of Exceedance depicted on Fragility Curves it has a lower chance of exceeding or reaching its damage state.