Analisis Kelelahan Pada Struktur Bravo Wellhead Platform Dengan Penambahan Luas Sub-Cellar Deck Menggunakan Metode Cummulative Damage dan Fracture Mechanics

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. ================ 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)
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 > Ocean Engineering > (S1) Undergraduate Theses
Depositing User: Bagus Panuntun
Date Deposited: 21 Jan 2019 02:18
Last Modified: 21 Jan 2019 02:18
URI: http://repository.its.ac.id/id/eprint/53456

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