Panuntun, Bagus (2018) Analisis Kelelahan Pada Struktur Bravo Wellhead Platform Dengan Penambahan Luas Sub-Cellar Deck Menggunakan Metode Cummulative Damage dan Fracture Mechanics. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Offshore fixed platform didefinisikan sebagai platform yang berada di atas permukaan air dan ditopang Piles dari dasar laut, dan juga lebih sering menerima beban berulang sehingga menyebabkan kelelahan struktur. Kelelahan sturktur merupakan suatu proses dari kumulatif kerusakan yang disebabkan oleh pengulangan fluktuasi beban yang dapat mengakibatkan keruntuhan meskipun beban yang diterima tidak melebihi batas maksimum untuk beban statik. Tugas akhir ini bertujuan untuk menganalisis kelelahan struktur Bravo Wellhead Platform yang beroperasi di Selat Madura dengan kedalaman perairan di lokasi tersebut adalah 180.0 ft terhadap MSL (Mean Sea Level). Dalam tugas akhir ini penulis menggunakan metode cumulative damage d an fracture mechanics. Pada metode cummulative damage didapatkan umur kelelahan terpendek dibawah MSL sebesar 89,342 tahun pada tubular joint 303. Selanjutnya, dilakukan analisa lokal dan penambahan crack menggunakan metode fracture mechanics terhadap tubular joint 303. Tubular joint paling kritis selanjutnya dianalisa menggunakan metode fracture mechanics dengan memberikan crack sebesar a = 0.25 mm, a⁄2c = 0.15 dan didapatkan umur kelelahannya. Kemudian diketahui selisih umur kelelahan dari kedua metode ini sebesar 22,241 tahun. Kesimpulan dari tugas akhir ini adalah retak yang nantinya ditambahkan ke dalam struktur dapat mengurangi service life struktur secara signifikan.
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Offshore fixed platform is defined as a platform that is above the surface of
the water and
sustained Piles from the seabed, and also more often receives repeated loads causing
structural fatigue
.
Structure fatigue is a process of cumulative damage caused by the
repetition of fluctuations in loads that may result in collapse even th
ough the load received
does not exceed the maximum limit for static load
.
This final project aims to analyze the
fatigue of the Bravo Wellhead Platform structure operating in the Madura Strait with the
depth of the waters
at the site is 180.0 ft against MSL
(Mean Sea Level). In this final project
the author uses cumulative damage and fracture mechanics method. In the method of
cummulative damage obtained the shortest fatigue life under MSL of 89.342 years in tubular
joint 30. Furthermore, local analysis and
the addition of crack using fracture mechanic
s
method to tubular joint 303.
The most critical tubular joints were then analyzed using the
fracture mechanics method by giving crack a = 0.25 mm,
a/2c = 0.15 and obtained fatigue
life. Then the differenc
e in fatigue life of both methods is 22,241 years. The conclusion of
this final project is that the crack which is added to the structure can reduce the service life
structure significantly.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 627.98 Pan a-1 2018 3100018078703 |
| Uncontrolled Keywords: | cumulative damage, fracture mechanics, retak (crack), fatigue life, offshore platform, tubular joint |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.38 Materials--Fatigue. T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Bagus Panuntun |
| Date Deposited: | 21 Jan 2019 02:18 |
| Last Modified: | 16 Oct 2020 03:16 |
| URI: | http://repository.its.ac.id/id/eprint/53456 |
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