Analisis Respons Struktur Saddle Support dan Sambungan Tubular pada Jacket Offshore Substation Akibat Settlement saat Proses Roll Up

Alfatih, Wildan Malika Candra (2026) Analisis Respons Struktur Saddle Support dan Sambungan Tubular pada Jacket Offshore Substation Akibat Settlement saat Proses Roll Up. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Offshore Substasion Platform merupakan kunci utama dalam menunjang keberhasilan sistem Offshore Wind Farm pada transisi energi bersih. Selama proses fabrikasi, struktur jacket Offshore Substasion Platform akan melalui beberapa tahapan seperti proses roll-up pada bagian dari struktur jacket. Pada tahap ini, saddle support berfungsi sebagai tumpuan sementara yang menjaga kestabilan dan membantu proses ketika roll up. Pada penelitian ini dilakukan analisis roll-up pada struktur jacket dengan variasi roll-up angle yaitu 0°, 30°, 60°, 75,4°, dan 96,4°. Permasalahan muncul pada fabrikasi XYZ yakni Ketika proses roll up terjadi settlement, yang menyebabkan peningkatan tegangan lokal, dan risiko kegagalan struktur. Penelitian ini menganalisis respon saddle support pada kondisi normal dan settlement dengan variasi settlement 5, 10, dan 15 cm menggunakan analisis global dengan SACS, lalu analisis lokal sambungan tubular dengan pendekatan finite element melalui ANSYS. Pada analisis roll-up didapatkan respon struktur saddle tidak mengalami kegagalan member stress, akan tetapi terdapat critical area pada sambungan tubular K joint dan X joint dengan maksimum unity check yaitu 0,994 pada roll-up angle 96,4 derajat dan maksimum untuk joint strength yaitu 0,982 saat kondisi settlement 15 cm. Meskipun masih dibawah syarat dari analisis global, hasil tersebut perlu dicek pada analisis lokal untuk mengetahui tegangan yang terjadi pada area sambungan. Pada analisis lokal tubular joint, diperoleh hasil tegangan maksimum X joint sebesar 264,6 MPa dan pada K joint sebesar 323,9 MPa yang mana diketahui bahwa tegangan pada K joint berada diatas allowable stress. Setelah dilakukan mitigasi dengan penambahan thickness pada joint stub brace 10 mm, didapatkan bahwa terjadi penurunan tegangan yang terjadi pada K joint sebesar 172,29 MPa. Dari analisis tersebut maka modifikasi penambahan thickness dapat direkomendasikan pada proses fabrikasi roll up Ketika terjadi settlement untuk mencegah kegagalan struktur.
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Offshore Substation Platform is the main key in supporting the success of the Offshore Wind Farm system in the clean energy transition. During the fabrication process, the Offshore Substation Platform jacket structure will go through several stages such as the roll-up process on part of the jacket structure. At this stage, the saddle support functions as a temporary support that maintains stability and helps the process during the roll up. In this study, a roll-up analysis was conducted on the jacket structure with variations in roll-up angles, namely 0°, 30°, 60°, 75.4°, and 96.4°. Problems arise in XYZ fabrication, namely when the roll up process occurs settlement, which causes an increase in local stress, and the risk of structural failure. This study analyzes the response of saddle support under normal and settlement conditions with settlement variations of 5, 10, and 15 cm using global analysis with SACS, then local analysis of tubular connections with a finite element approach through ANSYS. The roll-up analysis revealed that the saddle structure did not experience member stress failure. However, there were critical areas at the tubular K-joint and X-joint joints, with a maximum unity check of 0.994 at a rollup angle of 96.4 degrees and a maximum joint strength of 0.982 at a settlement of 15 cm. Although still below the requirements of the global analysis, these results need to be checked in a local analysis to determine the stress that occurs in the joint area. In the local analysis of the tubular joint, the maximum stress obtained for the X-joint was 264.6 MPa and for the Kjoint was 323.9 MPa, which is known to be above the allowable stress. After mitigation by adding a thickness of 10 mm to the joint stub brace, it was found that there was a decrease in stress that occurred at the K-joint of 172.29 MPa. From this analysis, modifications to the
thickness addition can be recommended in the roll-up fabrication process when settlement occurs to prevent structural failure.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Struktur Jacket, Roll-Up, Tubular Joint, Finite Metode Elemen Hingga, Jacket Structure, Roll-Up, Tubular Joint, Finite Element Method
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:	Wildan Malika Candra Alfatih
Date Deposited:	21 Jan 2026 02:23
Last Modified:	21 Jan 2026 02:23
URI:	http://repository.its.ac.id/id/eprint/129905

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