Studi Eksperimen Efek Inti High Rubber Untuk Meningkatkan Performa Isolator

Tanaya, Dimas Rizky (2026) Studi Eksperimen Efek Inti High Rubber Untuk Meningkatkan Performa Isolator. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Berbagai jenis perangkat seismik telah dikembangkan sebagai peredam gempa pada struktur bangunan, dengan isolator seismik berbasis timbal sebagai salah satu yang paling banyak digunakan. Namun, penggunaan timbal sebagai material inti isolator menimbulkan kekhawatiran terkait dampak lingkungan, risiko kesehatan, dan pembatasan regulasi, sehingga mendorong pengembangan material alternatif yang lebih ramah lingkungan. Tesis ini menyajikan hasil eksperimen mengenai perilaku material isolator melalui serangkaian pengujian laboratorium untuk mengevaluasi kelayakan inti *High Damping Rubber* (HDR) sebagai pengganti inti timbal pada isolator seismik. Campuran karet alam dengan berbagai komposisi material terlebih dahulu diuji karakteristik dan ketahanannya di laboratorium, kemudian digunakan untuk memproduksi prototipe isolator. Prototipe tersebut selanjutnya diuji untuk menginvestigasi pengaruh variasi persentase dan volume inti HDR terhadap sifat mekanis isolator, meliputi kekakuan vertikal, kekakuan horizontal, dan rasio redaman. Hasil pengujian menunjukkan bahwa penambahan inti HDR tidak selalu meningkatkan kekakuan horizontal secara langsung. Pada variasi regangan, kekakuan horizontal spesimen isolator A1, B1, dan C1 masing-masing sebesar 0,61 kN/mm, 0,63 kN/mm, dan 0,52 kN/mm. Sebaliknya, penambahan inti HDR secara signifikan meningkatkan kemampuan disipasi energi. Pada kondisi variasi regangan, rasio redaman isolator C1 mencapai 12,34%, lebih tinggi dibandingkan isolator A1 yang sebesar 6,89%. Peningkatan frekuensi dan beban vertikal juga cenderung meningkatkan rasio redaman, dengan nilai tertinggi sebesar 13,60% pada isolator C1 di bawah beban vertikal 314 kN. Penggunaan inti HDR berdiameter 80 mm memberikan kinerja redaman terbaik, meskipun peningkatan ukuran inti perlu dioptimalkan agar kemampuan disipasi energi tetap seimbang dengan kekakuan horizontal isolator. Hasil penelitian ini menunjukkan bahwa berbagai komposisi material inti HDR berpotensi meningkatkan kemampuan disipasi energi sekaligus mempertahankan stabilitas mekanis, sehingga dapat menjadi alternatif yang ekonomis dan ramah lingkungan dalam pengembangan isolator seismik.
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Various types of seismic devices have been developed to mitigate earthquake effects on building structures, with lead-core seismic isolators being among the most widely used. However, the use of lead as the core material raises concerns regarding environmental impacts, health risks, and regulatory restrictions, prompting the development of more environmentally friendly alternatives. This thesis presents the experimental evaluation of High Damping Rubber (HDR) cores as a substitute for lead cores in seismic isolators through a series of laboratory tests. Mixtures of natural rubber and various additives were first prepared and tested to evaluate their material properties and durability before being used to fabricate prototype isolators. The prototypes were subsequently tested to investigate the effects of different HDR core proportions and core volumes on the mechanical properties of the isolators, including vertical stiffness, horizontal stiffness, and damping ratio. The experimental results indicate that the addition of an HDR core does not necessarily increase horizontal stiffness. Under varying strain levels, the horizontal stiffness of isolator specimens A1, B1, and C1 was 0.61 kN/mm, 0.63 kN/mm, and 0.52 kN/mm, respectively. In contrast, the HDR core significantly improved the energy dissipation capability of the isolators. Under strain variations, the damping ratio of specimen C1 reached 12.34%, exceeding that of specimen A1, which was 6.89%. Increasing the loading frequency and vertical load also tended to improve the damping ratio, with the highest value of 13.60% obtained for specimen C1 under a vertical load of 314 kN. An HDR core with a diameter of 80 mm provided the best damping performance, although further optimization of the core size is required to maintain an appropriate balance between energy dissipation capacity and horizontal stiffness. Overall, the findings demonstrate that various HDR core material compositions have the potential to enhance energy dissipation while maintaining mechanical stability, making them a promising, economical, and environmentally friendly alternative for the development of seismic isolators.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	isolator seismik; uji siklik isolator; penelitian inti high damping rubber. seismic isolators; cyclic seismic isolator test ; experiments of high damping rubber core
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.38 Materials--Fatigue.
Divisions:	Faculty of Civil Engineering and Planning > Architechture > 23101-(S2) Master Theses
Depositing User:	Dimas Rizky Tanaya
Date Deposited:	28 Jul 2026 07:14
Last Modified:	28 Jul 2026 07:14
URI:	http://repository.its.ac.id/id/eprint/138703

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