Analisis Perbandingan Kinerja Struktur Gedung Menggunakan Base Isolation dan Fixed Base Terhadap Beban Gempa (Studi Kasus : Gedung Kuliah Terpadu IAIN Kudus)

Alamsyah, Muhammad Ravianto (2026) Analisis Perbandingan Kinerja Struktur Gedung Menggunakan Base Isolation dan Fixed Base Terhadap Beban Gempa (Studi Kasus : Gedung Kuliah Terpadu IAIN Kudus). Undergraduate thesis, UPN Veteran Jawa Timur.

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Abstract

Indonesia is located within the Pacific Ring of Fire, making it highly susceptible to seismic activity due to the interaction of active tectonic plates. This condition necessitates the implementation of earthquake-resistant structural systems capable of improving structural safety and performance, particularly for public and educational buildings. This study aims to analyze the effect of applying a High Damping Rubber Bearing (HDRB) base isolation system on the seismic response and structural performance of the Integrated Lecture Building of IAIN Kudus. The building was modified from seven to nine stories, and the seismic location was adjusted to the Special Region of Yogyakarta to represent a higher seismic hazard. Structural analysis was conducted using a three-dimensional response spectrum method in accordance with SNI 1726:2019, while structural performance was evaluated through nonlinear static pushover analysis based on the ATC-40 guidelines. Two structural configurations were investigated: a fixed-base system and an HDRB base-isolated system. The results indicate that the implementation of base isolation increased the fundamental period of the structure from approximately 0.75 s to 6.5 s. In addition, the base shear was significantly reduced from 31,436.97 kN to 4,178.41 kN, representing an 87% reduction, while the average inter-story drift decreased from approximately 24 mm to 6 mm, corresponding to a 75% reduction. The plastic hinge distribution showed that the first yielding in the base-isolated structure occurred at displacements of 0.046 m in the X-direction and 0.036 m in the Y-direction, whereas the fixed-base structure experienced first yielding at 0.010 m and 0.011 m, respectively, indicating that the base-isolated system possesses greater deformation capacity before sustaining structural damage. Although both structural systems satisfied the Immediate Occupancy (IO) performance level, the HDRB base isolation system demonstrated substantially superior seismic performance by effectively reducing structural responses and maintaining post-earthquake operational functionality.

Item Type:

Thesis (Undergraduate)

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