Desain Penambahan Doubler Plate Untuk Mengatasi Kegagalan Punching Shear Pada Proses Roll-Up Struktur Jacket

Tatag, Langlang Samudra (2025) Desain Penambahan Doubler Plate Untuk Mengatasi Kegagalan Punching Shear Pada Proses Roll-Up Struktur Jacket. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5020211106-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (11MB) | Request a copy

Abstract

Offshore Substansion Platform merupakan kunci utama dalam menunjang keberhasilan sistem Offshore Wind Farm pada transisi energi bersih. Selama proses fabrikasi, struktur jacket Offshore Substansion Platform akan melalui beberapa tahapan seperti proses roll-up pada bagian dari struktur jacket. Pada perencanaan desain lifting fabrikasi roll-up yang dialami oleh PT. SMOE Indonesia, terjadi permasalahan yaitu fenomena punching shear pada horizontal frame structure yang mengakibatkan kegagalan struktur dalam menahan gaya tekan yang berlangsung selama proses roll-up. Pada penelitian ini dilakukan analisis roll-up pada struktur jacket dengan variasi roll-up angle yaitu 0°, 30°, 60°, 75,4°, 90°, dan 96,4°. Proses pemodelan dan analisis struktur jacket menggunakan software SACS dilakukan untuk mengetahui respon struktur jacket dan reaksi yang terjadi selama pengangkatan. Tahap analisis SACS dilakukan dengan dua variasi komponen temporary roll-up support yang berbeda. Pada analisis roll-up didapatkan respon struktur jacket tidak mengalami kegagalan member stress, dengan maksimum unity check yaitu 0,937 pada roll-up angle 30 derajat dan unity check maksimum untuk joint strength yaitu 1,268 pada roll-up angle 0 derajat. Hasil tersebut menunjukkan kegagalan joint strength yang melebihi kriteria desain, sehingga perlu mitigasi penambahan doubler plate dengan Metode Elemen Hingga. Pada analisis lokal titik kegagalan punching shear, diperoleh hasil tegangan maksimal adalah 423,15 Mpa. Setelah dilalukan mitigasi doubler plate dengan variasi ketebalan 13 mm dan 15 mm didapatkan bahwa terjadi penurunan tegangan maksimal hingga 298,91 Mpa dan 292,47 Mpa. Dari analisis tersebut maka modifikasi penambahan doubler plate dapat digunakan selama proses fabrikasi roll-up untuk mencegah kegagalan pada proses roll-up 0 derajat.
=============================================================================================================================
The Offshore Substation Platform serves as a critical component in supporting the success of Offshore Wind Farm systems during the clean energy transition. During the fabrication phase, the jacket structure of the Offshore Substation Platform undergoes several stages, including the roll-up process of specific structural sections. In the design planning for the roll-up lifting process conducted by PT. SMOE Indonesia, a structural issue was identified—namely, the occurrence of punching shear in the horizontal frame structure, which resulted in failure to withstand compressive forces during the roll-up operation. This study carried out a roll-up analysis of the jacket structure using roll-up angle variations of 0°, 30°, 60°, 75,4°, 90°, and 96,4°. Modeling process and structural analysis were conducted using SACS software to assess the structural response and load reactions throughout the lifting process. The analysis included two variations of temporary roll-up support components. The results showed that the jacket structure did not experience member stress failure, with a maximum unity check of 0,937 at a 30° roll-up angle. However, the maximum joint strength unity check reached 1,268 at a 0° roll-up angle, exceeding the allowable design criteria and indicating joint failure. To address this issue, a mitigation strategy involving the addition of a doubler plate was proposed and evaluated using the Finite Element Method. A localized analysis at the punching shear failure point revealed a maximum stress of 423,15 MPa. After applying doubler plates with thickness variations of 13 mm and 15 mm, the maximum stress was reduced to 298,91 MPa and 292,47 MPa, respectively. Based on these results, the implementation of doubler plate modifications is considered effective in preventing structural failure during the 0° roll-up phase of the fabrication process.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Jacket, Roll-up, Punching Shear, Doubler Plate, Finite Element Method, Metode Elemen Hingga
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Langlang Samudra Tatag
Date Deposited:	10 Jul 2025 03:00
Last Modified:	10 Jul 2025 03:00
URI:	http://repository.its.ac.id/id/eprint/119456

Actions (login required)

View Item