Analisis Ultimate Strength Dan Keandalan Pada Well Production Platform Dengan Variasi Kenaikan Beban Vertikal

Ulum, Mohammad Dimas Bachrul (2025) Analisis Ultimate Strength Dan Keandalan Pada Well Production Platform Dengan Variasi Kenaikan Beban Vertikal. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Jacket platform merupakan salah satu bangunan lepas pantai yang masih umum digunakan diperairan Indonesia terutama pada perairan bagian utara jawa. Analisis pada suatu bangunan lepas pantai terpancang pasti akan dihadapkan pada suatu kondisi yang dapat berubah seiring waktu berjalan seperti perubahan pada beban peralatan, material, geometri struktur dan beberapa penyebab lainnya. Oleh karena itu pada penelitian ini akan dilakukan analisis ultimate strength menggunakan pushover dengan melakukan variasi kenaikan pada beban vertikal. Tujuan dari penelitian ini meliputi mengetahui ultimate capacity (UC) dari hasil analisis statis (inplace), lalu hasil reserve strength ratio (RSR) analisis pushover, serta hasil keandalan yang dihasilkan. Analisis pushover kali akan menggunakan 8 derajat arah pembebanan lateral yaitu 0o, 45o, 90o, 135o, 180o, 225o, 270o, 315o beban vertikal pada topside akan dinaikan sampai struktur mengalami collapse sehingga didapat nilai RSR dari analisis tersebut. Setelah itu akan dilakukan analisis keandalan menggunakan simulasi monte carlo. Berdasarkan simulasi akan didapat moda kegagalan yang kemudian akan dikonvergen berdasarkan jumlah iterasi yang dilakukan. Lalu hasil moda kegagalan akan dikalkulasi lagi menggunakan keandalan sistem seri atau paralel sehingga didapat nilai keandalan sistemnya. Hasil yang didapat analisis inplace bahwa UC tertinggi adalah 0.618 pada member 309-305. Lalu pada hasil analisis ultimate strength, RSR terkecil didapat pada variasi pembebanan lingkungan arah 135o adalah 4.328. Pada hasil analisis keandalan didapat keandalan sistem terendah adalah 0.80934
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Jacket platforms are one of the offshore structures still commonly used in Indonesian waters, especially in the waters of northern Java. Analysis of a fixed offshore structure will certainly be faced with conditions that can change over time such as changes in equipment loads, materials, structural geometry and several other causes. Therefore, in this study, an ultimate strength analysis will be conducted using pushover by varying the increase in vertical loads. The objectives of this study include determining the ultimate capacity (UC) from the results of the static analysis (in-place), then the results of the reserve strength ratio (RSR) of the pushover analysis, and the resulting reliability results. The pushover analysis will use 8 degrees of lateral loading direction, namely 0o, 45o, 90o, 135o, 180o, 225o, 270o, 315o. The vertical load on the topside will be increased until the structure collapses to obtain the RSR value from the analysis. After that, a reliability analysis will be conducted using Monte Carlo simulation. Based on the simulation, a failure mode will be obtained which will then be converged based on the number of iterations performed. The failure mode results will then be recalculated using the series or parallel system reliability to obtain the system reliability value. The in-place analysis results show that the highest UC is 0.618 for members 309-305. The ultimate strength analysis results show that the smallest RSR is 4.328 for the 135° environmental loading variation. The reliability analysis results show the lowest system reliability is 0.80934

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Pushover, Base Shear, Reserve Strength Ratio, Keandalan, Monte Carlo.
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:	Mohammad Dimas Bachrul Ulum
Date Deposited:	18 Jul 2025 02:58
Last Modified:	18 Jul 2025 02:58
URI:	http://repository.its.ac.id/id/eprint/119980

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