Studi Komparasi Gedung Apartemen 23 Lantai Di Bekasi Dengan Struktur Baja Komposit Menggunakan Buckling Restrained Braced Frame (BRBF)

Husniyah, Siti Nafisahtul (2026) Studi Komparasi Gedung Apartemen 23 Lantai Di Bekasi Dengan Struktur Baja Komposit Menggunakan Buckling Restrained Braced Frame (BRBF). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Berdasarkan data yang diterbitkan oleh Pusat Studi Gempa Nasional (PUSGEN), wilayah Bekasi Selatan tergolong dalam zona dengan tingkat potensi gempa sedang hingga tinggi disebabkan oleh keberadaan Sesar Baribis dan Sesar Citarik. Secara geologi, Bekasi Selatan tersusun atas endapan aluvial muda yang cenderung lunak dan memiliki kemampuan memperbesar guncangan gempa (amplifikasi lokal). Dalam praktiknya, pembangunan gedung apartemen ini dibangun menggunakan Sistem Rangka Pemikul Momen Khusus (SRPMK) dengan Shear Wall yang menggunakan material beton bertulang. Dalam tugas akhir ini akan dilakukan analisis komparasi sturktur eksisting dan struktur baja beton komposit dengan Buckling Restrained Braced Frames (BRBF) dengan konfigurasi inverted V. Pada gedung modifikasi digunakan bracing BRBF dengan ukuran 5 inch, 7 inch, 8 inch, 9 inch, 11 inch, dan 13 inch. Posisi konfigurasi BRBF didasari untuk mengakomodasi adanya torsi pada struktur gedung. Penggunaan sistem Buckling Restrained Braced Frame (BRBF) pada gedung apartemen 23 lantai di Bekasi memberikan perubahan signifikan terhadap perilaku struktur. Struktur modifikasi dengan BRBF memiliki berat mati 52% lebih ringan dan berat total 32% lebih rendah dibandingkan struktur eksisting. Periode fundamental mengalami peningkatan 26,37% pada arah X dan 33,56% pada arah Y, yang menunjukkan berkurangnya kekakuan lateral akibat mekanisme leleh yang terlokalisasi pada core BRB. Berdasarkan analisis gempa respons spektra, penggunaan BRBF mampu mengurangi gaya geser dasar hingga 45,76% pada arah X dan 49,48% pada arah Y. Respons simpangan antar lantai juga mengalami perubahan, yaitu penurunan sebesar 79,93% pada arah X namun hanya 21,25% pada arah Y, menandakan bahwa efektivitas BRBF sangat dipengaruhi oleh konfigurasi pemasangannya terhadap distribusi kekakuan dan torsi struktur. Kinerja struktur tetap memenuhi batas keselamatan karena elemen BRBF bekerja sebagai perangkat disipasi energi, di mana core BRB mengalami pelelehan terkontrol sementara restrainer mencegah buckling. Secara keseluruhan, penggunaan BRBF memberikan peningkatan performa seismik yang signifikan melalui reduksi gaya geser dan pengendalian drift, meskipun peningkatan periode menyebabkan perubahan karakteristik deformasi struktur. Optimalisasi ukuran bracing dari 5 hingga 13 inch mampu menyeimbangkan kebutuhan teknis dan efisiensi material tanpa mengurangi performa struktur.
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Based on data published by the National Center for Earthquake Studies (Pusat Studi Gempa Nasional – PUSGEN), South Bekasi is classified as a region with moderate to high seismic hazard, primarily due to the presence of the Baribis Fault and Citarik Fault. Geologically, South Bekasi consists of young alluvial deposits that tend to be soft and have the potential to amplify seismic ground motions (local amplification). In practice, the apartment building under study was originally constructed using a Special Moment Resisting Frame (SMRF) system combined with reinforced concrete shear walls. This final project presents a comparative analysis between the existing structural system and a modified composite steel–concrete structure incorporating Buckling Restrained Braced Frames (BRBFs) with an inverted-V configuration. In the modified structure, BRBFs with sizes of 5, 7, 8, 9, 11, and 13 inches were employed. The configuration and placement of the BRBFs were determined to accommodate torsional effects in the building structure. The application of the Buckling Restrained Braced Frame (BRBF) system in the 23-story apartment building in Bekasi resulted in significant changes in structural behavior. The modified structure exhibited a 52% reduction in dead load and a 32% reduction in total structural weight compared to the existing structure. The fundamental period increased by 26.37% in the X-direction and 33.56% in the Y-direction, indicating a reduction in lateral stiffness due to the localized yielding mechanism within the BRB core. Based on response spectrum seismic analysis, the use of BRBFs reduced the base shear force by up to 45.76% in the X-direction and 49.48% in the Y-direction. The interstory drift response also changed, showing a reduction of 79.93% in the X-direction but only 21.25% in the Y-direction, indicating that the effectiveness of BRBFs is strongly influenced by their configuration with respect to stiffness distribution and structural torsion. The structural performance remained within safety limits, as the BRBF elements functioned as energy dissipation devices, where the BRB core underwent controlled yielding while the restrainer prevented buckling. Overall, the use of BRBFs provided a significant improvement in seismic performance through base shear reduction and drift control, although the increase in structural period altered the deformation characteristics of the structure. Optimization of bracing sizes ranging from 5 to 13 inches successfully balanced technical requirements and material efficiency without compromising structural performance.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Struktur Baja Komposit, Tahan Gempa, Bresing Baja Tahan Tekuk, Apartemen, Bekasi, Composite Steel Structure, Seismic-Resistant Design, Buckling Restrained Bracing, Apartment Building, Bekasi
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA656.2 Buckling T Technology > TH Building construction T Technology > TH Building construction > TH1095 Earthquakes and building
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Siti Nafisahtul Husniyah
Date Deposited:	21 Jan 2026 06:00
Last Modified:	21 Jan 2026 06:00
URI:	http://repository.its.ac.id/id/eprint/129953

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