Home⇛Aka Student Research Journal⇛vol. 3 no. 1 (2024)

Fragility curves prediction of select buildings with soft-story and re-entrant corner irregularities in San Jose, Occidental Mindoro

Mia Joice M. Gadores | John Meylord P. Ibon | Colin B. Agbayani | Reymar S. Ledesma

Discipline: Civil Engineering

 

Abstract:

Since buildings are designed for different needs, this leads to significant irregularities. Predominantly, their response to ground motions concerned their resilience during seismic events. Considering different performance objectives, this research bridged the gap in determining the as-constructed irregular buildings' response against ground motions adapting ASCE provisions in a localized setting. The buildings first underwent finite element modeling considering the as-built plan, structural specifications, and spectral accelerations of Occidental Mindoro. Performing nonlinear static analysis resulted in the pushover curves and subsequently generated the fragility curves by the log-normal distributions of the spectral displacements. Polynomial curve fitting developed the best-fit fragility curves and produced mathematical models. The calibrated models resulted in a very strong correlation (R2 = 0.9994 and RMSE = 0.0321) between the input and the output variables. In addition, a 0.3794 RMSE value resulted in the validation of the predicted models to the code-based fragility curves, giving a very high correlation. Further, for the Ms. 7.1 earthquake, the Hotel A and the Hotel B were expected to be 27.61% and 44.72% damaged, with 33.14% and 33.104% serviceable after the disaster. Thus, based on member checks, Hotel A (soft-story) and Hotel B (re-entrant) buildings were susceptible to magnitude five and beyond earthquakes.



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