Analisis Komparatif Pengaruh Orientasi Denting Terhadap Ultimate Strength Tubular Member

Octavia, Ocha Oxana (2025) Analisis Komparatif Pengaruh Orientasi Denting Terhadap Ultimate Strength Tubular Member. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Eksplorasi dan produksi minyak serta gas bumi di wilayah lepas pantai membutuhkan struktur pendukung yang andal, salah satunya adalah struktur fixed jacket. Struktur ini tersusun dari tubular member yang rentan mengalami deformasi lokal berupa denting akibat benturan eksternal, seperti insiden dropped object. Bentuk denting akibat tumbukan benda silinder dikenal sebagai cylindrical dent dan dapat mempengaruhi kekuatan struktur secara signifikan.
Penelitian ini bertujuan untuk menganalisis pengaruh orientasi denting terhadap ultimate strength dari tubular member akibat beban impact, dengan fokus pada tiga orientasi denting : longitudinal, transversal, dan tilted. Simulasi numerik dilakukan menggunakan Finite Element Method (FEM) melalui perangkat lunak ANSYS LS-DYNA untuk mengevaluasi ultimate load capacity pada berbagai orientasi denting dan variasi dimensi indenter. Tahap akhir dari analisis dilakukan menggunakan metode pushover untuk mendapatkan respons struktur pasca denting secara lebih menyeluruh. Hasil menunjukkan bahwa orientasi denting memberikan pengaruh signifikan terhadap performa struktural. Orientasi longitudinal menghasilkan ultimate strength tertinggi sebesar 5534 kN, diikuti orientasi tilted (5375 kN), dan transversal (5217 kN). Selain itu, peningkatan diameter dan panjang indenter cenderung menurunkan kapasitas struktural, dengan sensitivitas tertinggi terhadap diameter pada orientasi transversal, dan terhadap panjang pada orientasi tilted.
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Offshore oil and gas exploration and production require reliable support structures, one of which is the fixed jacket platform. This structure consists of tubular members that are prone to local deformation, such as denting, due to external impacts like dropped object incidents. Dents caused by cylindrical object collisions, known as cylindrical dents, can significantly affect the structural strength. This study aims to analyze the influence of dent orientation on the ultimate strength of tubular members subjected to impact from a cylindrical indenter, focusing on three orientations: longitudinal, transversal, and tilted. Numerical simulations were conducted using the Finite Element Method (FEM) through ANSYS LS-DYNA to evaluate the ultimate load capacity of dented structures under different orientations and indenter dimensions. A pushover analysis was also performed to assess the post-dent structural response in more detail. The results show that dent orientation has a significant effect on structural performance. Longitudinal denting produces the highest ultimate strength at 5534 kN, followed by tilted (5375 kN) and transversal (5217 kN) orientations. Additionally, increasing the diameter and length of the indenter generally reduces the ultimate strength, with the highest sensitivity to diameter observed in the transversal orientation, and to length in the tilted orientation.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Analisa Lokal, ANSYS LS-DYNA, FEM, Impact, Pushover, ANSYS LS-DYNA, FEM, Impact, Local Analysis, Pushover
Subjects:	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:	Ocha Oxana Octavia
Date Deposited:	17 Jul 2025 08:24
Last Modified:	17 Jul 2025 08:24
URI:	http://repository.its.ac.id/id/eprint/119938

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