Seismic assessment of 3d structural model and design of san gabriel I elementary school building utilizing capacity spectrum method: Integrating retrofitting approach using lead rubber bearing support/ Piolo Jandel A. Cometa, John Paul S. Floro, Kathy May C. Gregorio, Reimark Jason R. Guran, Vanessa Anne T. Madriaga, Lynlee Bless F. Villanueva.--

Bachelor's Thesis

College of Engineering.-- Bachelor of science in civil engineering: Technological University of the Philippines, 2024.

Includes bibliographic references and index.

The Philippines faces increasing concerns over frequent seismic events, including
the potential occurrence of "The Big One," a large-scale earthquake associated with the
Marikina Valley Fault. This study evaluates the effectiveness of base isolation systems in
mitigating seismic risks for building structures, focusing on San Gabriel I Elementary
School in General Mariano Alvarez, Cavite. Two structural models were developed using
ETABS: a bare structure and a modified structure with Lead Rubber Bearings (LRB) as
base isolators. Pushover Analysis and the Capacity Spectrum Method (CSM) were
employed to assess the seismic performance of both models. Ground motion data from
PHIVOLCS were processed using Seismosignal and Seismomatch for spectral matching
based on UBC 1997. A capacity curve was generated from the pushover curve through
FEMA 440 EL, showing the roof-level displacement and base shear. Performance points
for the models were determined using response spectra, and fragility curves were
developed to estimate the probability of collapse damage states. The analysis revealed that
the X-axis of both models demonstrated greater strength than the Y-axis. The structure
equipped with LRB showed superior seismic performance, with higher base shear capacity
and reduced displacement compared to the bare structure. Damage states determined
through CSM indicated that the LRB-enhanced model experienced significantly lower
damage, ranging from "Moderate" to "Slight" along the X-axis and "Extensive" to "Slight
to Moderate" along the Y-axis, compared to the bare structure.