Febriyanti, Cyntia Puspa (2026) Karakterisasi Material dan Analisis Numerik Kinerja Seismik Scrap Inner Tube Fiber-Reinforced Elastomeric Isolator (SIT-FREI) pada Rumah Tinggal Sederhana. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Indonesia, sebagai negara dengan tingkat seismik yang tinggi, menghadapi tantangan besar dalam menanggulangi kerentanan bangunan rumah tinggal terhadap dampak gempa bumi. Meskipun sistem isolasi dasar telah terbukti efektif, tingginya biaya produksi dan instalasi isolator membatasi penerapannya pada bangunan sederhana. Penelitian ini bertujuan untuk mengevaluasi performa seismik suatu solusi isolasi alternatif yang terjangkau dan berkelanjutan, yaitu Scrap Inner Tube Fiber Reinforced Elastomeric Isolator (SIT-FREI), menggunakan ban dalam bekas kendaraan motor sebagai material elastomer. Sifat mekanis material dikarakterisasi melalui pengujian berat jenis, kekerasan Shore A, tarik uniaksial, dan relaksasi tegangan. Data pengujian digunakan untuk merepresentasikan sifat hiperelastik-viskoelastik pada Abaqus. Model elemen hingga FREI terlebih dahulu divalidasi terhadap data eksperimental dari literatur. Model SIT-FREI didesain agar sesuai dengan karakteristik rumah dan divariasikan nilai shape factor (S) sehingga didapatkan isolator dengan nilai redaman terbesar yaitu SIT-FREI B dengan S = 12,91. Isolator tersebut menghasilkan nilai KV = 50.670,3896 kN/m, KH = 209,8689 kN/m, Wd = 293,987, dan β = 11,0109%. Hasil kurva histeresis SIT-FREI disederhanakan menggunakan analisis matematis model Trilinear Hysteresis Model (THM). Respons fixed-base dan isolated-base dibandingkan menggunakan LTHA dengan tiga pasang rekaman gempa yang dimodifikasi terhadap spektrum target kelas situs C. Hasil menunjukkan bahwa penerapan SIT-FREI meningkatkan periode fundamental dari 0,398 detik menjadi 0,768 detik, menurunkan gaya geser dasar sebesar 9 – 32%, dan menurunkan rasio simpangan antar tingkat sebesar 50 – 84%. Temuan ini menunjukkan potensi SIT-FREI untuk struktur bermassa ringan, tetapi kesimpulan masih dibatasi oleh belum dilakukannya pengujian fisik isolator, variasi material yang terbatas, dan kebutuhan verifikasi pada displacement desain penuh.
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Indonesia, as a country with high seismicity, faces significant challenges in mitigating the vulnerability of residential buildings to earthquake impacts. Although base isolation systems have proven effective, the high production and installation costs limit their application in simple buildings. This research aims to evaluate the seismic performance of an affordable and sustainable alternative isolation solution, namely the Scrap Inner Tube Fiber Reinforced Elastomeric Isolator (SIT-FREI), utilizing scrap motorcycle inner tubes as the elastomeric material. The mechanical properties of the material were characterized through specific gravity, Shore A hardness, uniaxial tensile, and stress relaxation tests. The test data were used to represent the hyperelastic-viscoelastic properties in Abaqus. The finite element model of the FREI was first validated against experimental data from the literature. The SIT-FREI model was designed to match the characteristics of the residential house, and the shape factor (S) was varied to obtain the isolator with the highest damping value, namely SIT-FREI B with S = 12,91. This isolator yielded values of KV = 50.670,3896 kN/m, KH = 209,8689 kN/m, Wd = 293,987, and β = 11,0109%. The hysteresis curve results of the SIT-FREI were simplified using the mathematical Trilinear Hysteresis Model (THM) analysis. The fixed-base and isolated-base responses were compared using LTHA with three pairs of ground motion records modified to match the target spectrum of Site Class C. The results showed that the application of SIT-FREI increased the fundamental period from 0,398 seconds to 0,768 seconds, reduced the base shear by 9 – 32%, and decreased the inter-story drift ratio by 50 – 84%. These findings demonstrate the potential of SIT-FREI for light-mass structures; however, the conclusions are still limited by the lack of physical isolator testing, limited material variations, and the need for verification at full design displacement.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | isolasi dasar, ban dalam bekas, fiber-reinforced elastomeric isolator, analisis elemen hingga, analisis riwayat waktu, base isolation, scrap inner tube, fiber-reinforced elastomeric isolator, finite-element analysis, response-history analysis |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | Cyntia Puspa Febriyanti |
| Date Deposited: | 27 Jul 2026 06:38 |
| Last Modified: | 27 Jul 2026 06:38 |
| URI: | http://repository.its.ac.id/id/eprint/137974 |
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