Analisis Keandalan Ultimate Jacket Platform 3 Kaki Akibat Variasi Beban Gempa

Bramantyo, Yudhistira Yusuf (2025) Analisis Keandalan Ultimate Jacket Platform 3 Kaki Akibat Variasi Beban Gempa. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sebuah jacket platform harus dapat bertahan di beberapa kondisi yang ekstrem. Salah satu kondisi tersebut adalah saat kondisi gempa. Gempa memberikan beban terhadap jacket platform melalui interaksi atara pergerakan tanah dan respon struktur. Tugas Akhir ini menganalisis keruntuhan Jacket platform 3 kaki akibat beban gempa dengan variasi Peak Ground Acceleration berbasis keandalan. Metode yang digunakan pada Tugas Akhir ini adalah pushover non-linier untuk menganalisis ultimate strength struktur terhadap beban gempa. Analisis ultimate strength dilakukan menggunakan software SACS. Kemudian dilanjutkan menganalisis keandalan struktur menggunakan metode simulasi Monte Carlo dan Reliability Block Diagram. Dari hasil analisis, didapatkan UC member dan joint mengalami kenaikan pada tiap kenaikan PGA dengan UC terbesar adalah 1.36 untuk member 303-405 dan 1.106 untuk joint 205 pada PGA 0.350 g. Hasil RSR dan keandalan sistem yang didapatkan mengalami penurunan pada tiap kenaikan PGA. Didapatkan RSR terkecil 2.25 dan keandalan sistem terkecil 0.574 dengan indeks keandalan terkecil 0.18 pada PGA 0.350 g.
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A Jacket platform must be able to withstand various extreme conditions. One of these conditions is during an earthquake. Earthquakes impose loads on the jacket platform through the interaction between soil movement and structural response. This thesis analyzes the collapse of a three-legged jacket platform due to seismic loads with variation in Peak Ground Acceleration (PGA) based on reliability analysis. The method used in this study is a nonlinear pushover analysis to assess the ultimate strength of the structure under seismic loads. The ultimate strength analysis is conducted using SACS software, followed by a structural reliability analysis using the Monte Carlo simulation method. The analysis results show that the UC (Unity Check) values for members and joints increase with each increment of PGA, with the highest UC being 1.36 for member 303-405 and 1.106 for joint 205 at a PGA of 0.350 g. The resulting RSR (Reserve Strength Ratio) and system reliability decrease with increasing PGA. The lowest RSR obtained is 2.25 , and the lowest system reliability is 0.574 with 0.18 as the reliability index at a PGA of 0.350 g.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Jacket Platform, Peak Ground Acceleration, Pushover, Seismik, Seismic
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:	Yudhistira Yusuf Bramantyo
Date Deposited:	15 Jul 2025 06:50
Last Modified:	15 Jul 2025 06:50
URI:	http://repository.its.ac.id/id/eprint/119784

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