Gayatri, Noviandini Trisna (2026) Desain Modifikasi dan Studi Komparasi Gedung Eksisting dan Gedung Modifikasi dengan Sistem Eccentrically Braced Frame (EBF) Tipe Split K-Brace pada Tower Office BNI PIK 2. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Indonesia termasuk dalam wilayah negara yang rawan gempa, salah satunya adalah wilayah Banten. Hal ini dikarenakan posisinya yang berada di zona subduksi dan dilewati oleh tiga jenis sesar. Gempa banyak menimbulkan kerugian, baik harta maupun korban jiwa. Dalam mencegah dan mengurangi angka kerugian yang ditimbulkan, diciptakanlah inovasi dalam struktur bangunan, salah satunya adalah sistem rangka baja eksentris (Eccentrically Braced Frames). Sistem Struktur EBF dianggap memiliki kelebihan dibanding sistem struktur yang lain dikarenakan keberadaan elemen link yang memiliki daktilitas tinggi. Elemen link inilah yang berfungsi sebagai penahan gempa pada struktur. Link berfungsi dalam mendisipasi energi gempa, sehingga energi gempa tidak banyak menyentuh elemen struktur lainnya. Dimana ketika gempa terjadi, hanya elemen link yang diharapkan untuk hancur, sedangkan elemen struktur lain masih bertahan. Dalam tugas akhir ini, dilakukan komparasi hasil analisa struktur pada struktur gedung lama (eksisting) dengan struktur gedung modifikasi. Modifikasi yang dilakukan yaitu dengan merubah gedung lama menjadi struktur rangka baja dengan tipe split K-brace. Modifikasi yang dilakukan pada gedung perkantoran 20 lantai yang berada di wilayah Tangerang, Provinsi Banten. Dan didapatkan hasil berat struktur gedung modifikasi lebih kecil 54,67%; periode struktur 3,539 s (arah x), 3,304 s (arah y) dibanding gedung eksisting 1,396 s (arah x), 1,258 s (arah y); simpangan arah x lebih besar 64,06%, arah y lebih kecil 10,55%; gaya geser dasar arah x lebih kecil 69,09% dan arah y lebih kecil 65,69%. Berdasarkan hasil perhitungan yang telah dilakukan, didapatkan hasil perencanaan pelat lantai dengan steel deck tebal 0,75 mm, tebal beton 11 cm dan tulangan D10-200. Dimensi balok cucu wide flange 100.50.5.7, dimensi balok anak WF 200.100.5,5.8 (terkecil), dan WF 450.200.9.14 (terbesar), dimensi balok induk WF 150.75.5.7 (terkecil) dan WF 500.200.11.19 (terbesar), dimensi link tipe 1 WF 700.300.15.28 (terbesar) panjang 1,235 m, tipe 2 WF 600.200.10.15 panjang 1 m, tipe 3 WF 700.300.13.20 panjang 1,235 m, balok luar link berdimensi sama dengan link, dimensi bresing tipe 1 dan 3 H 300.300.9.14; 350.350.16.16, tipe 2 H 200.200.8.12. Dimensi kolom bresing CFT 700.700.25; non bresing CFT 550.550.25 (terbesar). Perencanaan struktur bawah dengan pondasi eksterior 50 cm, 2x2; pondasi interior 60 cm, 2x2; pondasi bresing 60 cm, 2x3. Dimensi kolom pedestal bresing 800 mm x 800 mm; interior dan eksterior 650 mm x 650 mm. Dimensi poer 12 m x 4,2 m dan 2,5 m x 2,5 m. Dimensi sloof 400 x 600.
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Indonesia is included in the high seismic prone zone, one of the region is Banten. This is because the position is on the subduction zone and its crossed by three types of fault. Earthquake causes a lot of losses, both properties and lives. In order to preventing and reducing the number of losses incurred, inovations were created in building structures, one which is the Eccentrically Braced Frames (EBF) system. The EBF structural system is considered to have advantages over other structural systems due to the presence of link elements that have high ductility. It is the link element that functions as an earthquake resisting structure. The link functions in anticipating earthquake energy, so that earthquake energy doesn’t touch many other structural elements. In this Final Project, the comparison of the results of structural analysis on the old building structure (existing) with the modified building is carried out. The modification carried out is by changing the old building into a steel frame structure with a split K-brace type. The modification was carried out on a 20-story office building located at Tangerang, Banten. The results show that the structural weight of the modified building is 54,67% lower; the structural period is 3,539 s in the X-direction and 3,304 s in the Y-direction, compared to the existing building, which has periods of 1,396 s in the X-direction and 1,258 s in the Y-direction; the story drift in the X-direction is 64,06% higher, while in the Y-direction it is 10,55% lower; the base shear force in the X-direction is 69,09% lower and in the Y-direction is 65,69% lower. Based on the calculation results that have been carried out, the floor slab design use steeldeck with 0,75 mm thickness, a concrete thickness of 11 cm, D10-200 reinforcement. The dimensions of the tertiary beams is wide flange 100.50.5.7, the dimensions of the secondary beams is WF 200.100.5,5.8 (smallest) and WF 450.200.9.14 (largest), and the dimensions of the primary beams are WF 150.75.5.7 (smallest) and WF 500.200.11.19 (largest). The dimension of link type 1 is WF 700.300.15.28 (largest) with 1,235 length, type 2 WF 600.200.10.15 with 1 m length, type 3 WF 700.300.13.20 with 1,235 m length. The dimensions of the outer beams of the link have the same dimensions as the link. The dimensions of bracing type 1 and 3 are H 300.300.9.14; 350.350.16.16 and type 2 H 200.200.8.12. the largest dimensions of the braced columns is CFT 700.700.25, while the non-braced columns is CFT 550.550.25. The substructure design of exterior column uses pile foundation 50 cm, 2x2; interior uses 60 cm, 2x2; bracing uses 60 cm, 2x3. The dimensions of the bracing pedestal columns is 800 mm x 800 mm, and the interior and exterior pedestal columns is 650 mm x 650 mm. The dimensions of the pile caps are 12 m x 4,2 m and 2,5 m x 2,5 m. The dimensions of the tie beams are 400 x 600.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Earthquake Resistance Building, Eccentrically Braced Frame, Link Element, Bangunan Tahan Gempa, Elemen Link |
| 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) > TA658 Structural design T Technology > TA Engineering (General). Civil engineering (General) > TA660.F7 Structural frames. |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis |
| Depositing User: | Noviandini Trisna Gayatri |
| Date Deposited: | 28 Jan 2026 08:52 |
| Last Modified: | 28 Jan 2026 08:52 |
| URI: | http://repository.its.ac.id/id/eprint/130802 |
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