Seismic Vulnerability Assessment of College of Engineering and Architecture (CEA) Extension Building in Don Honorio Ventura State University (DHVSU) Main Campus Using Fragility Curves

Abstract

Due to its location on the Pacific Plate, surrounded by continents prone to movement and earthquakes, the Philippines is susceptible to earthquakes. In the Philippines, earthquakes can cause significant damage and disruption to higher education institutions. This research will be centered on the College of Engineering and Architecture (CEA) Extension Building on the Main Campus of Don Honorio Ventura State University (DHVSU) in Bacolor, Pampanga. Fragility curve’s primary objective is to evaluate seismic vulnerability. The CEA Extension Building is more vulnerable to "The Big One," a magnitude 7.2 earthquake located west of the West Valley Fault with a distance of 55.6 kilometers; therefore, the investigation sought to evaluate the CEA Extension Building's seismic vulnerability. As required by the NSCP for Seismic Zone 4 regions, fragility curves were constructed to determine whether the structure could withstand a PGA earthquake of 0.4g with a maximum probability of exceedance of 10%. In order to achieve this goal, a dataset of 15 local and 15 international earthquakes was obtained from Incorporated Research Institutions for Seismology (IRIS). These earthquakes were chosen to represent a spectrum of PGA excitations, from 0.1g to 3.0g in 0.1g increments. A CEA Extension Building structural model was created using the software SAP2000. The CSM was then used to conduct Pushover Analysis using this model. The CEA Extension Building has a 10% Probability of Exceeding a "complete damage" state at 0.592g PGA on its X-axis, which corresponds to Intensity VIII, resulting in significant structural trembling. In addition, the analysis revealed that the "complete damage" condition for the CEA Extension Building had calculated the highest probability of exceedance along the X-axis of 5.27 percent and the Y-axis of zero percent at a PGA of 0.4g. Notably, the results were within the 10% limit, signifying that the DHVSU - Main Campus CEA Extension Building complies with the NSCP seismic requirements for structures in Seismic Zone 4. Consequently, the CEA Extension Building on the DHVSU-Main Campus does not necessitate a suitable retrofitting strategy.