Analisis Operabilitas On Bottom Stability Pada Saat Instalasi Platform XYZ

Wardah, Septhia Roihanatul Wardah (2024) Analisis Operabilitas On Bottom Stability Pada Saat Instalasi Platform XYZ. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ketinggian gelombang adalah faktor yang sangat dinamis pada lingkungan laut. Tinggi gelombang dapat terjadi berbeda-beda dari satu waktu ke waktu lainnya. Instalasi jacket platform memerlukan analisis operabilitas yang cermat karena proses instalasi membutuhkan waktu yang singkat dengan kondisi laut yang tidak pasti. Kondisi gelombang yang tidak pasti dapat mengakibatkan gagalnya instalasi pada jacket platform. Penelitian ini akan menganalisis operabilitas on bottom stability pada kondisi beban gelombang yang berbeda. Tujuan dari analisis ini adalah untuk memperoleh nilai safety factor dari daya dukung tanah, sliding stability, overturning moment, dan operabilitas struktur berdasarkan analisis on bottom stability. Analisis ini menggunakan metode elemen hingga yang direkomendasikan oleh API RP 2A WSD. Analisis ini dibantu menggunakan software SACS dan PLAXIS 3D. Digunakan 3 bentuk mudmat yang berbeda agar diketahui hasil on bottom stability yang paling optimal. Daya dukung tanah dianalisa pada kondisi gelombang maksimum, dihasilkan factor of safety kritis sebesar 22,57 kondisi bentuk full mudmat, 4,03 kondisi bentuk setengah mudmat, dan 0,59 kondisi tanpa mudmat. Pada analisis sliding capacity nilai factor of safety sliding paling kecil terjadi pada ketinggian gelombang signifikan 1,35 meter dengan peak period 6,35 detik. Nilai factor of safety kritis kondisi full mudmat sebesar 50,98, pada kondisi setengah mudmat 8,08, dan pada kondisi tanpa mudmat 0,79. Batas maksimum ketinggian gelombang signifikan agar dapat diijinkan dan factor of safety dapat memenuhi adalah 4,58 meter pada variasi full mudmat dan 4,16 meter variasi setengah mudmat. Pada analisis overturning moment nilai factor of safety overturning moment kritis terjadi pada ketinggian gelombang signifikan 1,35 meter dengan peak period 4,25 detik. Nilai factor of safety kritis kondisi full mudmat sebesar 6,21, pada kondisi setengah mudmat 3,07, dan pada kondisi tanpa mudmat 2,92. Batas maksimum ketinggian gelombang signifikan agar dapat diijinkan dan factor of safety dapat memenuhi adalah 3,03 meter pada variasi full mudmat dan 2,44 meter pada variasi setengah mudmat dan variasi tanpa mudmat.
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Wave height is a highly dynamic factor in the marine environment, varying from one moment to another. The installation of a jacket platform requires careful operability analysis due to the short installation timeframe and uncertain sea conditions. Uncertain wave conditions can lead to installation failure of the jacket platform. This study aims to analyze the on-bottom stability operability under different wave load conditions. The objective of this analysis is to obtain the safety factor values for soil bearing capacity, sliding stability, overturning moment, and structural operability based on on-bottom stability analysis. This analysis uses the finite element method recommended by API RP 2A WSD. The analysis is supported by SACS and PLAXIS 3D software. Three different mudmat shapes are used to determine the most optimal on-bottom stability results. Soil bearing capacity is analyzed under maximum wave conditions, yielding a critical safety factor of 22.57 for the full mudmat condition, 4.03 for the half mudmat condition, and 0.59 for the condition without mudmat. In the sliding capacity analysis, the smallest safety factor occurs under a significant wave height of 1.35 meters with a peak period of 6.35 seconds. The critical safety factor values are 50.98 for the full mudmat condition, 8.08 for the half mudmat condition, and 0.79 for the condition without mudmat. The maximum allowable significant wave height, where the safety factor remains compliant, is 4.58 meters for the full mudmat variation and 4.16 meters for the half mudmat variation. In the overturning moment analysis, the critical safety factor occurs at a significant wave height of 1.35 meters with a peak period of 4.25 seconds. The critical safety factor values are 6.21 for the full mudmat condition, 3.07 for the half mudmat condition, and 2.92 for the condition without mudmat. The maximum allowable significant wave height, where the safety factor remains compliant, is 3.03 meters for the full mudmat variation and 2.44 meters for both the half mudmat and the condition without mudmat.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bearing capacity, On bottom stability, Operability, Overturning moment, Sliding, Daya dukung tanah, On bottom stability, Operabilitas, Overturning moment, Sliding
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization T Technology > TA Engineering (General). Civil engineering (General) > TA775 Foundations. T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Septhia Roihanatul Wardah
Date Deposited:	26 Jul 2024 03:42
Last Modified:	26 Jul 2024 03:42
URI:	http://repository.its.ac.id/id/eprint/109061

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