Citation :

Jeffrey DG. Clemente, Raphael Alessandro S. Navarro, Angelica Mae D. Dela Torre, Rechellyn S. Yalong, June-june P. Santos, Michael Bautista Baylon, "Seismic Fragility Analysis Using the Capacity Spectrum Method (CSM) of a Modern Four-Storey Classroom Building," International Journal of Civil Engineering, vol. 13, no. 5, pp. 375-387, 2026. Crossref, https://doi.org/10.14445/23488352/IJCE-V13I5P126

Abstract

The Philippines is no stranger to earthquakes, but the worry over the future movement in the West Valley Fault (WVF) proves that the next large-scale earthquake can happen as soon as within the next half-century. Hence, many structures, including commercial, institutional, and residential types within a considerable vicinity of the fault line, would not be spared from the effects of the projected tremor. It is therefore important that seismic fragility analyses of these structures, such as modern four-storey classroom buildings, are done to make the necessary preparation and mitigation steps before the tremor strikes. Researchers utilized Midas Gen in modelling the building from the obtained structural plans. Using data from 20 earthquake events covering local and international records, the overall performance of the structure was also determined. Based on national standards on seismic design, in correlation with a PGA vs Intensity scale, the study concluded that the study site was able to behave adequately in a 0.4g scenario, suffering slight to moderate damage at maximum. In line with this assessment, researchers see the potential of using the seismic fragility analysis for older buildings around the area and for other structures as preemptive measures before any quake strikes.

Keywords

Pushover Curves, Fragility Curves, Capacity Spectrum Method, Seismic Vulnerability, Probability of Exceedance.

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