Optimasi Desain Mudmat Berdasarkan Analisis On Bottom Stability Struktur Jacket Tiga Kaki

Pratiwi, Zhahara Suci (2024) Optimasi Desain Mudmat Berdasarkan Analisis On Bottom Stability Struktur Jacket Tiga Kaki. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Tahap awal dalam instalasi struktur jacket adalah ketika stuktur jacket melayang menuju ke permukaan dasar laut (seabed) sebelum dipasang secara permanen dengan tiang pancang. Pada tahap tanpa tiang pancang, mudmat memiliki peran penting sebagai pondasi sementara dalam menjaga kestabilan struktur jacket. Analisis On Bottom Stability (OBS) diperlukan dalam tahap ini untuk memastikan kestabilan struktur jacket. Komponen pijakan struktur yang berperan penting dalam analisis OBS dikenal juga dengan mudmat. Mudmat memiliki peranan penting sebagai pondasi sementara dalam menjaga kestabilan yang menyababkan desain dan ukuran mudmat perlu dipertimbangkan dalam perancangan desain suatu struktur. Sehingga dilakukan optimasi topologi untuk mengoptimalkan jalur distribusi beban serta dimensi sehingga diperoleh berat optimum. Pada penelitian ini, optimasi topologi mudmat dilakukan secara lokal dengan menurunkan distribusi material hingga didapatkan energi regangan minimum. Hasil optimasi kemudian diinterpretasikan untuk mendapatkan desain yang layak. Didapatkan dua hasil, yakni desain mudmat hasil optimasi dengan persebaran material 30% dan 20%. Kedua desain ini menghasilkan Factor of Safety (FoS) lebih kecil di banding desain initial. Presentase penurunan FoS pada analisis OBS kriteria bearing untuk desain 1 dan 2 adalah masing-masing 59% dan 50%, overturning 43% dan 21%, serta sliding 67% dan 59%. Meskipun demikian, kedua desain masih memenuhi kriteria OBS dengan FoS di atas ambang batas, yaitu >2 dan 1,5. Pada struktur mudmat dengan desain initial berat strukturnya adalah 49,8 kips. Setelah dilakukan optimasi, diperoleh dua rekomendasi desain struktur hasil optimasi dengan penurunan berat struktur masing-masing sebesar 40% dan 29%.

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The initial stage in the installation of the jacket structure occurs when the jacket structure floats towards the seabed surface before being permanently installed with piles. During the stage without piles, the mudmat plays an important role as a temporary foundation in maintaining the stability of the jacket structure. On Bottom Stability (OBS) analysis is needed at this stage to ensure the stability of the jacket structure. The structural footing component that plays an important role in the OBS analysis is also known as the mudmat. Because the mudmat is crucial as a temporary foundation, its design and size must be considered in the structural design. Therefore, topology optimization is carried out to optimize the load distribution path and dimensions to obtain the optimum weight. In this study, mudmat topology optimization was carried out locally by reducing the material distribution until the minimum strain energy was obtained. The optimization results were then interpreted to obtain a feasible design. Two optimized mudmat designs were achieved with material distributions of 30% and 20%. Both of these designs produce a smaller Factor of Safety (FoS) compared to the initial design. The percentage of FoS reduction in the OBS analysis of bearing criteria for designs 1 and 2 is 59% and 50%, respectively, overturning 43% and 21%, and sliding 67% and 59%. However, both designs still meet the OBS criteria with FoS above the threshold, namely >2 and 1.5. In the initial mudmat structure, the structural weight is 49.8 kips. After optimization, two recommendations for optimized structural designs were obtained with a reduction in structural weight of 40% and 29%, respectively.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	On Bottom Stability, Struktur Jacket, Optimasi Topologi,On Bottom Stability, Jacket Structure, Topology Optimization
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 > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	ZHAHARA SUCI PRATIWI
Date Deposited:	25 Jul 2024 03:21
Last Modified:	25 Jul 2024 03:21
URI:	http://repository.its.ac.id/id/eprint/108857

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