Analisis Pushover Jacket 4 Kaki Akibat Penuaan Dengan Evaluasi Failure Assessment Diagram

Satriya, Briliansyah Muhammad (2026) Analisis Pushover Jacket 4 Kaki Akibat Penuaan Dengan Evaluasi Failure Assessment Diagram. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5020221011-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (21MB) | Request a copy

Abstract

Banyak jacket platform di Indonesia telah beroperasi melampaui umur rancangannya sehingga mengalami penurunan kapasitas struktur akibat fatigue corrosion, terutama pada area splash zone yang rentan terhadap reduksi ketebalan dan konsentrasi tegangan. Penelitian ini bertujuan mengevaluasi pengaruh fatigue corrosion terhadap kekuatan residual dan kelayakan operasi (fitness-for-service) jacket platform empat kaki melalui integrasi analisis pushover dan metode Failure Assessment Diagram (FAD). Hasil analisis pushover menunjukkan nilai Reserve Strength Ratio (RSR) minimum sebesar 2,469 pada arah pembebanan 270°, sedangkan nilai Strength Redundancy (SR) minimum sebesar 1,046 pada arah pembebanan 225°. Analisis lokal pada tubular joint 304L, 404L, dan 301L sebagai joint kritis menghasilkan nilai Stress Intensity Factor (SIF) maksimum masing-masing sebesar 10,15; 30,72; dan 6,83 MPa√m pada kedalaman retak 9,525 mm. Evaluasi FAD menunjukkan seluruh tubular joint mengalami kegagalan akibat plastic collapse, dengan kecenderungan bergeser menuju brittle fracture seiring bertambahnya kedalaman retak. Tubular joint 2 menjadi lokasi paling kritis dengan Kr = 0,41 dan Lr = 6,62, sedangkan tubular joint 1 dan 3 memiliki margin keamanan lebih tinggi.
==============================================================================================================================
Many jacket platforms in Indonesia have continued to operate beyond their design life, resulting in a reduction of structural capacity due to fatigue corrosion, particularly in the splash zone area, which is vulnerable to thickness reduction and stress concentration. This study aims to evaluate the effect of fatigue corrosion on the residual strength and operational feasibility (fitness-for-service) of a four-legged jacket platform through the integration of pushover analysis and the Failure Assessment Diagram (FAD) method. The pushover analysis results show a minimum Reserve Strength Ratio (RSR) of 2.469 at a loading direction of 270°, while the minimum Strength Redundancy (SR) value is 1.046 at a loading direction of 225°. Local analysis on tubular joints 304L, 404L, and 301L as critical joints yields maximum Stress Intensity Factor (SIF) values of 10.15, 30.72, and 6.83 MPa√m, respectively, at a crack depth of 9.525 mm. FAD evaluation indicates that all tubular joints fail due to plastic collapse, with a tendency to shift toward brittle fracture as crack depth increases. Tubular joint 2 is identified as the most critical location, with Kr = 0.41 and Lr = 6.62, while tubular joints 1 and 3 exhibit higher safety margins.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Anjungan Lepas Pantai, Pushover, Failure Assessment Diagram (FAD), Mekanika Kepecahan, Jacket Platform, Pushover, Failure Assessment Diagram (FAD), Fracture Mechanics
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA418.38 Materials--Fatigue. 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:	Briliansyah Muhammad Satriya
Date Deposited:	24 Jul 2026 07:26
Last Modified:	24 Jul 2026 07:27
URI:	http://repository.its.ac.id/id/eprint/137101

Actions (login required)

View Item