Studi Efek Infilled Frame pada Penerapan Sistem Isolasi Gempa untuk Bangunan Eksisting 4 Lantai

Khofifah, Nur (2026) Studi Efek Infilled Frame pada Penerapan Sistem Isolasi Gempa untuk Bangunan Eksisting 4 Lantai. Masters thesis, Institut Teknologi Sepuluh Nopember.

Text 6012241015-Master_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (7MB) | Request a copy

Abstract

Base isolation merupakan salah satu metode retrofit yang efektif untuk meningkatkan kinerja seismik bangunan melalui perpanjangan periode alami dan peningkatan disipasi energi. Namun, keberadaan infilled frame sebagai elemen non-struktural dapat meningkatkan kekakuan lateral sehingga berpotensi memengaruhi efektivitas sistem isolasi. Penelitian ini bertujuan mengevaluasi pengaruh infilled frame terhadap efektivitas sistem base isolation pada bangunan beton bertulang eksisting 4 lantai. Analisis dilakukan pada empat model, yaitu Fixed Base (FB), Fixed Base dengan Infilled Frame (FB+IF), Base Isolated (BI), dan Base Isolated dengan Infilled Frame (BI+IF). Evaluasi menggunakan Nonlinear Time History Analysis (NLTHA) berdasarkan ASCE 41-17 dengan tujuh pasang riwayat waktu gempa yang telah disesuaikan terhadap spektrum target Surabaya pada tingkat gempa BSE-1E dan BSE-2E. Hasil penelitian menunjukkan bahwa infilled frame meningkatkan kekakuan struktur yang ditandai dengan penurunan periode fundamental dari 0,985 detik menjadi 0,454 detik pada model FB, sedangkan pada model BI berubah dari 2,55 detik menjadi 2,47 detik. Dibandingkan model fixed base, penerapan base isolation mampu menurunkan gaya geser dasar hingga sekitar 72%, simpangan antar lantai sekitar 70%, percepatan lantai atap sekitar 80%, dan jumlah sendi plastis sekitar 67%, serta meningkatkan disipasi energi hingga 64,49%. Meskipun infilled frame sedikit mengurangi efektivitas sistem isolasi akibat peningkatan kekakuan struktur, model BI+IF tetap menunjukkan kinerja seismik yang lebih baik dibandingkan model fixed base.
=====================================================================================================================================
Base isolation is an effective retrofit strategy for improving seismic performance by lengthening the structural fundamental period and enhancing energy dissipation. However, the presence of infilled frames increases lateral stiffness, potentially reducing the effectiveness of the isolation system. This study evaluates the influence of infilled frames on the effectiveness of a base isolation system applied to an existing four-story reinforced concrete building. Four structural models were analyzed: Fixed Base (FB), Fixed Base with Infilled Frame (FB+IF), Base Isolated (BI), and Base Isolated with Infilled Frame (BI+IF). Structural responses were evaluated using Nonlinear Time History Analysis (NLTHA) based on ASCE 41-17 with seven spectrum-compatible ground motion pairs representing the Surabaya target spectra for BSE-1E and BSE-2E hazard levels. The results show that infilled frames increased structural stiffness, reducing the fundamental period from 0.985 s to 0.454 s in the FB model and from 2.55 s to 2.47 s in the BI model. Compared with the fixed-base model, the base isolation system reduced base shear by approximately 72%, inter-story drift by 70%, roof acceleration by 80%, and the number of plastic hinges by 67%, while increasing energy dissipation by 64.49%. Although infilled frames slightly reduced the effectiveness of the isolation system, the BI+IF model consistently demonstrated superior seismic performance compared with the fixed-base models.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Base Isolation, Infillled Frame, Nonlinear Time History Analysis, Base Isolation, Infillled Frame, Nonlinear Time History Analysis
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA444 Reinforced concrete T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Nur Khofifah
Date Deposited:	28 Jul 2026 01:34
Last Modified:	28 Jul 2026 01:34
URI:	http://repository.its.ac.id/id/eprint/137985

Actions (login required)

View Item