Analisis Local Pile Pada Wellhead Platform Akibat Scouring

Arsyad, Seisar (2025) Analisis Local Pile Pada Wellhead Platform Akibat Scouring. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Permintaan energi yang terus meningkat telah mendorong eksplorasi minyak dan gas di lepas pantai, termasuk penggunaan fixed jacket platform untuk mendukung aktivitas eksploitasi di perairan dangkal hingga sedang. Namun, fenomena scouring atau pengikisan tanah di sekitar pile dapat mengancam stabilitas platform ini, terutama dalam kondisi arus kuat. Penelitian ini bertujuan untuk menganalisis dampak scouring terhadap integritas struktur lokal pile pada platform berkaki empat pada kondisi badai. Metode yang digunakan meliputi analisis global untuk memeriksa stabilitas keseluruhan struktur, serta analisis lokal yang berfokus pada distribusi tegangan di pile akibat variasi maksimum kedalaman scouring. Hasil penelitian menunjukkan variasi kedalaman scouring berpengaruh terhadap kekuatan global struktur,yaitu kenaikan unity check member stress check B02, kenaikan UC joint punching shear check joint nomor 435, dan kenaikan UC tiap pile pada variasi scouring. Kemudian kekuatan lokal struktur pile pada maksimum variasi kedalaman scouring tidak melebihi dari tegangan ijin (allowable stress). Sementara itu deformasi pile masih dalam batas aman merujuk standar API yaitu 0,47% dari 1%. Untuk deformasi tanah pada kondisi maksimum variasi kedalaman scouring dalam batas aman menurut standar NAFVAC yaitu 0,812% dari 1%.
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The increasing demand for energy has driven offshore oil and gas exploration, including the use of fixed jacket platforms to support exploitation activities in shallow to moderate water depths. However, the phenomenon of scouring, or soil erosion around piles, can threaten the stability of these platforms, especially under strong current conditions. This study aims to analyze the impact of scouring on the local structural integrity of piles on a four-legged platform during storm conditions. The methodology includes a global analysis to assess the overall structural stability and a local analysis focusing on stress distribution in the piles due to variations in maximum scouring depth. The results indicate that variations in scouring depth affect the global strength of the structure, as evidenced by increased unity check values in the member stress check for B02, increased UC in the joint punching shear check for joint number 435, and increased UC values for each pile across the scouring variations. Furthermore, the local strength of the pile structure under maximum scouring depth variation does not exceed the allowable stress. Meanwhile, pile deformation remains within safe limits according to API standards, recorded at 0.47% of the 1% threshold. Soil deformation under the maximum scouring depth variation is also within safe limits according to NAFVAC standards, recorded at 0.812% of the 1% threshold.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	fixed jacket platform, scouring, integritas struktur, analisis lokal pile,von mises, total deformation, structural integrity, local pile analysis
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA780 Piles and pile-driving T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Seisar Arsyad
Date Deposited:	21 Jul 2025 00:54
Last Modified:	21 Jul 2025 00:54
URI:	http://repository.its.ac.id/id/eprint/120111

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