Firaas, Naufal (2019) Analisis Kapasitas Ultimate Dented Tubular Member Dengan Penambahan Doubler Plate. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Tugas akhir ini dilatarbelakangi karena besarnya kemungkinan terjadi cacat pada tubular member, yang merupakan komponen yang paling banyak terdapat pada jacket platform, selama masa operasinya yang diakibatkan baik karena benda jatuh (dropped object) maupun tumbukan kapal (colliding vessel). Cacat yang dimaksudkan dalam tugas akhir ini lebih dikhususkan pada local dent. Salah satu cara penguatan (strengthening) member yang mengalami local dent adalah dengan menambahkan doubler plate. Sehingga pada tugas akhir ini dilakukan analisis terkait pengaruh penambahan doubler plate terhadap kapasitas dented tubular member menggunakan pemodelan finite element. Pada penelitian ini, data geometri, properties, hingga pembebanan mengacu pada thesis berjudul Assessment of The Residual Strength and Repair of Dent-Damaged Offshore Platform Bracing yang ditulis oleh William Michael Bruin. Analisis dilakukan dengan metode incremental load hingga member mengalami kegagalan pada kondisi non-reinforced maupun reinforced menggunakan doubler plate dengan empat jenis variasi ketebalan doubler plate. Hasil analisis didapatkan peningkatan kapasitas reinforced dented member (Pr) terhadap kapasitas non-reinforcednya (Pnr) sebesar 95,18% pada variasi pertama (td = T & ld = D); 93,853% pada variasi kedua (td = 0,78T & ld = D); 89,178% pada variasi ketiga (td = 3/16 in & ld = D); dan 66,657% pada variasi keempat (td = 1/8 in & ld = D). Kemudian persentase peningkatan kapasitas reinforced dented tubular member terhadap undamaged member adalah 21,194% pada variasi pertama; 20,359% pada variasi kedua; 17,457% pada variasi ketiga; dan 3,474% pada variasi keempat. Ketebalan minimal doubler plate yang dibutuhkan untuk meningkatkan kapasitas reinforced dented member mendekati kapasitas awalnya berdasarkan analisis terhadap variasi yang telah dilakukan adalah td = 1/8 in.
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Tubular member is the most common part in offshore structure especially jacket structure, which has possibility to damaged. Dent is the one of structural physical damage that can caused by impact. Therefore, one of the few methods that can reinforce dented tubular member is doubler plate. So, this final project will discuss about the ultimate capacity analysis of doubler plate- reinforced dented tubular member using finite element method. In this final project, the member geometry, material properties and boundary conditions data refers to the thesis entitled “Assessment of The Residual Strength and Repair of Dent-Damaged Offshore Platform Bracing” which written by William Michael Bruin. The incremental load method are used to obtain the ultimate capacity of non-reinforced dented tubular member and also reinforced dented tubular member (with doubler plate). The result will compared for each condition to obtain the increase of ultimate capacity. The doubler plate has four variations of thickness to obtain the minimum thickness needed to increase the ultimate capacity of reinforced dented tubular member approximate to undamaged condition. The result is the ultimate capacity of reinforced dented tubular member against non-reinforced dented tubular member was increased about 95,18% for the first variation doubler plate (td=T & ld=D); 93,853% for the second variation (td=0,78T & ld=D); 89,178% for the third variation (td=3/16in & ld=D); and 66,657% for the fourth variation (td = 1/8 in & ld = D). And then the ultimate capacity of reinforced dented tubular member against undamaged condition of dented tubular member was increased about 21,194% for the first variant; 20,359% for the second variant; 17,457% for the third variation; and 3,474% for the fourth variation. And the minimum thickness needed to increase maximum capacity of reinforced dented tubular member (Pr) approximate to maximum capacity undamaged member (Po) is td = 1/8 in.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Dent, doubler plate, finite element, incremental load |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Firaas Naufal |
| Date Deposited: | 24 Jun 2024 05:57 |
| Last Modified: | 24 Jun 2024 05:57 |
| URI: | http://repository.its.ac.id/id/eprint/69038 |
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