Optimasi Desain Tie-Braces Struktur Breasting Dolphin Pada Terminal Oil/Condensate Selat Berhala (Studi Kasus : Penguatan Struktur Breasting Dolphin Pada Petrochina Marine Terminal)

Puspitorini, Dyah Ayu (2017) Optimasi Desain Tie-Braces Struktur Breasting Dolphin Pada Terminal Oil/Condensate Selat Berhala (Studi Kasus : Penguatan Struktur Breasting Dolphin Pada Petrochina Marine Terminal). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini membahas tentang optimasi desain penguatan struktur breasting dolphin dengan penambahan struktur tie-braces. Struktur breasting dolphin ini merupakan struktur dolphin milik PetroChina yang pertama kali diinstal di Selat Berhala, lepas pantai Jambi. Struktur ini mengalami kegagalan karena adanya peningkatan beban pada aktifitas ekspor kapal tanker. Penguatan struktur ini sudah dilakukan pada tahun 2014, namun hasilnya tidak optimal (overdesign). Maka dilakukan optimasi desain penguatan struktur breasting dolphin tersebut dengan mencari tipe bentuk (konfigurasi), diameter luar dan tebal dinding yang optimal. Optimasi ini dilakukan untuk mengetahui berat struktur paling minimum. Variabel bebas dalam penelitian ini adalah diameter luar dan tebal dinding dengan constraints-nya adalah joint deflection check, member stress check dan joint punching shear stress check. Analisis yang dilakukan adalah analisis inplace dari beberapa struktur breasting dolphin dengan dimensi tie-braces yang bervariasi. Penentuan dimensi awal tie-braces (diameter luar dan tebal dinding) dilakukan dengan menggunakan parameter desain sesuai dengan kode standar API RP 2A WSD. Selanjutnya dilakukan optimasi pada data hasil analisis inplace untuk mengetahui diameter luar dan tebal dinding yang paling optimum pada tie-braces. Setelah analisis optimasi dilakukan didapatkan berat struktur optimum menjadi 2558 kN dari sebelumnya yaitu 2586 kN. ======================================================================================================================== This study discusses about optimization design of breasting dolphin’s structural strenghtening with additional tie-braces. Breasting dolphin structures were first installed at Petrochina Marine Terminal, in Berhala Straits, offshore Jambi. This structures have failed because of the increased load on the export activity of the tanker. The strengthening project of this structure has been carried out in 2014, but the results are overdesign (not optimal). So, this final project will carry out the optimization design of breasting dolphin structure by looking for the optimum configuration, outside diameter, and wall thickness. The objective function in this final project is to determine the minimum weight of the structure. The independent variables in this study is the outside diameter and wall thickness. The constraints is joint deflection check, member stress check (UC), and joint punching shear stress check. There are two type analysis in this final project. First, inplace analysis of several structures with the various tie-braces dimension. The calculation of the initial tie-braces dimension (outside diameter and wall thickness) was performed using parameters design according to API RP 2A WSD. And the second is optimization analysis of output data from inplace analysis to determine optimum outside diameter and wall thickness of tie-braces, also the weight of the structure. After optimization analysis conducted found optimum structural weight be 2558 kN from the previous 2586 kN.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: breasting dolphin, tie-braces, optimasi, variabel bebas, constraint
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: - DYAH AYU PUSPITORINI
Date Deposited: 27 Apr 2017 07:41
Last Modified: 08 Mar 2019 06:35
URI: http://repository.its.ac.id/id/eprint/3629

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