Comparative Study of Conventional System and Isolation System Using Lead Rubber Bearing in the University of Kadiri Building in Kediri

Nathanreswara, Pria (2025) Comparative Study of Conventional System and Isolation System Using Lead Rubber Bearing in the University of Kadiri Building in Kediri. Other thesis, Institute Technology Sepuluh Nopember.

Text 5012211163-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (15MB)

Abstract

Indonesia’s high seismic activity necessitates building structures capable of maintaining optimal performance during earthquakes. Conventional earthquake-resistant systems, such as moment-resisting frames and shear walls, are prone to collapse during strong ground motions, leading to structural damage. High structural stiffness may also amplify floor accelerations, increasing the risk of non-structural damage. To overcome these challenges, base isolation systems are used to decouple structures from ground motion, thereby reducing seismic energy transmission. This final project compares a conventional fixed-base structure and a base-isolated structure using Lead Rubber Bearings (LRB) in an 8-story reinforced concrete building at Universitas Kadiri, Kediri, East Java—an earthquake-prone region. The original moment-resisting frame system was modified by adding base isolators to assess their effectiveness in improving seismic performance and optimizing structural dimensions. LRB isolators were carefully selected based on axial load, displacement, and effective period through a trial-and-error process. The analysis was conducted using Linear Time History Analysis in ETABS, with seven earthquake records from the Natural Hazard Risks and Resiliency Research Centre (NHR3), adjusted to match the Indonesian Seismic Hazard Map. The selected LRB types, LH075G4 and LH060G4, met all performance criteria. The isolated structure showed optimized dimensions with beam sizes of 400×750 mm, 400×600 mm, and 300×500 mm, and column sizes of 800×800 mm and 400×800 mm. Compared to the fixed-base model, the base-isolated structure had greater base displacement, reduced inter-story drifts by over 40%, decreased base shear by more than 46%, and extended the structural period by over 150%. These results show that using LRB base isolation significantly improves the building’s seismic performance.
==========================================================================================================================================
Aktivitas seismik yang tinggi di Indonesia menuntut bangunan untuk mampu mempertahankan kinerja optimal selama terjadinya gempa bumi. Sistem struktur tahan gempa konvensional, seperti rangka pemikul momen dan dinding geser, rentan mengalami keruntuhan saat terjadi guncangan tanah yang kuat, yang dapat menyebabkan kerusakan struktural. Kekakuan struktur yang tinggi juga dapat memperbesar percepatan lantai, sehingga meningkatkan risiko kerusakan non-struktural. Untuk mengatasi tantangan ini, sistem isolasi dasar digunakan untuk memisahkan struktur dari gerakan tanah, sehingga mengurangi transmisi energi seismik. Tugas akhir ini membandingkan struktur konvensional dengan fondasi tetap dan struktur dengan sistem isolasi dasar menggunakan **Lead Rubber Bearing (LRB)** pada bangunan beton bertulang 8 lantai di Universitas Kadiri, Kediri, Jawa Timur—wilayah yang rawan gempa. Sistem rangka pemikul momen awal dimodifikasi dengan penambahan isolator dasar untuk mengevaluasi efektivitasnya dalam meningkatkan kinerja seismik dan mengoptimalkan dimensi struktur. Isolator LRB dipilih dengan cermat berdasarkan beban aksial, perpindahan, dan periode efektif melalui proses trial and error. Analisis dilakukan menggunakan **Linear Time History Analysis** di ETABS, dengan tujuh data gempa dari **Natural Hazard Risks and Resiliency Research Centre (NHR3)** yang telah disesuaikan dengan **Peta Bahaya Gempa Indonesia**. Jenis LRB terpilih, yaitu **LH075G4** dan **LH060G4**, memenuhi seluruh kriteria kinerja. Struktur dengan isolasi dasar menunjukkan dimensi yang lebih optimal, dengan ukuran balok 400×750 mm, 400×600 mm, dan 300×500 mm, serta ukuran kolom 800×800 mm dan 400×800 mm. Dibandingkan dengan model fondasi tetap, struktur dengan isolasi dasar mengalami perpindahan dasar yang lebih besar, penurunan simpangan antar lantai lebih dari 40%, pengurangan gaya geser dasar lebih dari 46%, dan perpanjangan periode struktur lebih dari 150%. Hasil ini menunjukkan bahwa penggunaan isolasi dasar LRB secara signifikan meningkatkan kinerja seismik bangunan.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Earthquake, Concrete Building, Base Isolation, Lead Rubber Bearing, Linear Time History Analysis
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
Divisions:	Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Pria Ariasatya Nathanreswara
Date Deposited:	28 Jul 2025 06:29
Last Modified:	28 Jul 2025 06:29
URI:	http://repository.its.ac.id/id/eprint/121858

Actions (login required)

View Item