Date of Publication

3-6-2025

Document Type

Master's Thesis

Degree Name

Master of Science in Civil Engineering

Subject Categories

Civil Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Advisor

Rodolfo P. Mendoza, Jr.

Defense Panel Chair

Lessandro Estelito O. Garciano

Defense Panel Member

Bernardo A. Lejano
Richard M. De Jesus

Abstract (English)

Seismic isolation systems have been introduced in the Philippines to enhance the earthquake resilience of structures. As a seismically active country, the adoption of such systems offers a promising solution to mitigating earthquake-induced damage. However, the Philippines currently lacks a dedicated design code for seismic isolation, posing challenges for engineers in ensuring consistency and reliability in their designs. Moreover, global design practices for seismic isolation vary significantly, such as the defined design-level earthquake, leading to differences in structural performance expectations. The benchmark model established by ISO 23618 was initially designed and then modified to comply with the minimum requirements of the National Structural Code of the Philippines (NSCP) and subsequently used for the design of base-isolated building. A key aspect of this research is the comparative analysis of base-isolated building designed for a Design Basis Earthquake (DBE) – a 475-year mean return interval (MRI), versus a Maximum Considered Earthquake (MCE) – a 2,475-year MRI. The overall structural performance of these designs was evaluated in compliance with NSCP standards, considering key performance indicators such as interstory drift, floor accelerations, shear coefficients, isolator displacement and shear strain using Time History Analysis. Findings indicate that base-isolated buildings designed for DBE and MCE meet the minimum safety requirements set by the NSCP while showing significant improvements in seismic performance compared to conventional fixed-base building. Thus, use of DBE level can be considered sufficient for base-isolated building. However, for MCE design, it requires larger isolation systems to improved isolator displacement and shear strain but provided higher floor acceleration. The study also highlights the effectiveness of seismic isolation in enhancing building resilience, providing valuable insights for the future development of Philippine seismic isolation design standards.

Keywords: Base-isolation, Lead Rubber Bearing (LRB), Design Basis Earthquake (DBE), Maximum Considered Earthquake (MCE)

Abstract Format

html

Abstract (Filipino)

None

Abstract Format

html

Language

English

Format

Electronic

Keywords

Structural engineering

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Embargo Period

3-6-2026

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