Analisis Kegagalan Saddle Support Tipe ‘U’ dan ‘V’ pada Proses Roll-up Jacket Reactive Compensation Substation (RCS) Tahap Fabrikasi: Studi Kasus PT. XYZ

Apsari, Elyta Adriyanti Dwi (2024) Analisis Kegagalan Saddle Support Tipe ‘U’ dan ‘V’ pada Proses Roll-up Jacket Reactive Compensation Substation (RCS) Tahap Fabrikasi: Studi Kasus PT. XYZ. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Anjungan reactive compensation substation (RCS) merupakan infrastruktur yang sangat penting untuk menunjang aktivitas eksploitasi energi angin di lepas pantai. Untuk membangun platform RCS, diperlukan beberapa tahapan fabrikasi dan konstruksi salah satunya yaitu proses roll-up struktur jacket. Pada proses roll-up tersebut, terjadi penurunan tanah pada fabrication yard yang mengakibatkan saddle support dapat terpapar risiko terjadinya kegagalan, sehingga dapat mengurangi efektivitas saddle support dalam menopang struktur di atasnya. Pada penelitian Tugas Akhir ini, akan dilakukan analisis konfigurasi roll-up seperti rigging, temporary structure, dan saddle support yang digunakan pada proses roll-up. Pemodelan dan analisis statis struktur jacket RCS row 2 menggunakan software SACS v11.3 dengan variasi roll-up angle yaitu 0°, 50°, 75°, 81°, 85°, dan 94.74° untuk mengetahui nilai unity check (UC) dan joint strength dari struktur jacket. Kemudian, analisis dilanjutkan pada saddle support secara lokal untuk mengetahui reaksi yang diterima pada salah satu saddle support akibat proses roll-up dan penurunan tanah. Analisis lokal pada saddle support perlu dilakukan untuk mengetahui maksimum tegangan equivalent von-mises dan nilai UC pada struktur dengan metode elemen hingga menggunakan software ANSYS Static Structure. Pada analisis roll-up menunjukkan bahwa respon struktur jacket tidak mengalami kegagalan dengan maksimum unity check yaitu 0.630 dan unity check maksimum untuk joint strength yaitu 0.808. Pada analisis konfigurasi rigging diperoleh maksimum efisiensi untuk sling yaitu 85.35% tipe Ø78 Cable Laid Grommet, untuk shackle dengan tipe Crosby Bolt Anchor yaitu 72.17%, sedangkan untuk crane adalah 89.44% tipe QUY 650. Pada analisis lokal untuk saddle support diperoleh respon untuk lokasi kritis yaitu pada U-Saddle 1 dengan maksimum von-mises stress sebesar 73.321 MPa dan unity check 0.476. Sedangkan pada V-Saddle A2 dengan maksimum von-mises stress sebesar 135.2 MPa dan unity check 0.877 yang masing-masing pada kondisi settlement 10 cm. Dari hasil unity check pada saddle support, struktur tidak mengalami kegagalan akibat beban maksimum dikarenakan masih memenuhi kriteria desain.
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The reactive compensation substation (RCS) platform is a very important infrastructure to support offshore wind energy exploitation activities. To build the RCS platform, several fabrication and construction stages are required, one of which is the roll-up process of the jacket structure. In the roll-up process, settlement occurs in the fabrication yard which results in the saddle support being exposed to the risk of failure, thus reducing the effectiveness of the saddle support in supporting the structure above it. In this Final Project research, the roll-up configuration such as rigging, temporary structure, and saddle support used in the roll-up process will be analyzed. Modeling and static analysis of the RCS row 2 jacket structure using SACS v11.3 software with roll-up angle variations of 0°, 50°, 75°, 81°, 85°, and 94.74° to determine the unity check (UC) value and joint strength of the jacket structure. Then, the analysis is continued on the saddle support locally to determine the reaction received on one of the saddle supports due to the roll-up process and settlement. Local analysis on the saddle support needs to be done to determine the maximum equivalent von-mises stress and UC value on the structure with the finite element method using ANSYS Static Structure software. The roll-up analysis shows that the structural response of the jacket does not fail with a maximum unity check of 0.630 and the maximum unity check for joint strength is 0.808. In the rigging configuration analysis, the maximum efficiency for sling is 85.35% type Ø78 Cable Laid Grommet, for shackle with Crosby Bolt Anchor type is 72.17%, while for crane is 89.44% type QUY 650. In the local analysis for the saddle support, the response for the critical location is obtained at U-Saddle 1 with a maximum von-mises stress of 73.321 MPa and a unity check of 0.476. While at V-Saddle A2 with a maximum von-mises stress of 135.2 MPa and unity check 0.877, each at a settlement condition of 10 cm. From the results of the unity check on the saddle support, the structure does not fail due to the maximum load because it still meets the design criteria.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Jacket, Metode Elemen Hingga, Penurunan Tanah, Jacket, Finite Element Method, Settlement, Roll-up, Saddle Support.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Elyta Adriyanti Dwi Apsari
Date Deposited:	26 Jul 2024 02:11
Last Modified:	26 Jul 2024 02:11
URI:	http://repository.its.ac.id/id/eprint/109002

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