Analisis Tegangan Seafastening Pada Transportasi Topside Menggunakan Barge Akibat Variasi Perletakan Module

Sitompul, Gian Gregoryous (2025) Analisis Tegangan Seafastening Pada Transportasi Topside Menggunakan Barge Akibat Variasi Perletakan Module. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Transportasi struktur lepas pantai seperti topside dengan barge adalah tahapan vital di industri migas, namun rawan kegagalan akibat gaya yang bekerja. Pada tugas akhir ini dilakukan penelitian untuk memahami dampak variasi perletakan topside terhadap stabilitas transportasi, mencakup kebutuhan ballasting, karakteristik motion barge, dan tegangan seafastening serta topside member serta melakukan analisis lokal pada member kritis. Hasil penelitian menunjukkan bahwa posisi topside secara signifikan memengaruhi massa air ballast yang dibutuhkan, dengan posisi aft dan midship memerlukan ballast lebih banyak dibandingkan posisi forward karena perbedaan lengan antara pusat berat topside dengan barge serta kondisi inisial draught dan trim akibat penempatan topside. Variasi posisi juga menghasilkan karakteristik motion barge yang berbeda, di mana gerakan pitch terbesar terjadi saat topsideberada paling jauh dari pusat gravitasi barge (posisi forward), dan gerakan roll lebih besar saat topside tidak berada di centerline. Tegangan pada seafastening dan topside member menunjukkan perbedaan kecil, namun momen pada member yang diamati secara spesifik mengalami perbedaan signifikan. Momen terkecil terjadi saat posisi topside di midship dan terbesar pada posisi forward, diikuti posisi aft. Ditemukan nilai unity check (UC) tertinggi sebesar 0,89 pada penempatan topside di bagian forward dan sisi starboard. Sementara itu, nilai UC terkecil sebesar 0,139 pada kondisi penempatan topside di bagian midship secara longitudinal dan tepat di centerline barge. Analisis finite element lebih lanjut menunjukkan bahwa tegangan Von Mises maksimum terjadi pada sambungan las seafastening. Tegangan ini mencapai 390 MPa, melampaui yield strength material, mengindikasikan deformasi plastis sebesar 2,91 mm
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The transportation of offshore structures, such as topside modules, using barge is a critical phase in the oil and gas industry, yet it is susceptible to failure due to various acting forces. This study was conducted to comprehensively understand the impact of varying topside placement on transportation stability, encompassing ballasting requirements, barge motion characteristics, and stresses on seafastening and topside members, alongside performing local analyses on critical members. Research findings indicate that topside position significantly influences the required ballast water mass; aft and midship placements demand more ballast than forward positions due to differing lever arms between the topside and barge centers of gravity, as well as initial draught and trim conditions. Positional variations also yield distinct barge motion characteristics, with the largest pitch motion occurring when the topside is furthest from the barge's center of gravity (forward position), and greater roll motion observed when the topside is off-centerline. While stresses on seafastening and topside members showed minor differences, the moments on specifically observed members varied significantly, with the smallest moments occurring at the midship topside position and the largest at the forward position, followed by the aft position. The highest unity check (UC) value of 0.89 was identified for topside placement in the forward section and on the starboard side, whereas the lowest UC value of 0.139 was found with the topside positioned midship longitudinally and at the barge's centerline. Further finite element analysis revealed that the maximum Von Mises stress occurred at the seafastening weld joints, reaching 390 MPa, which exceeds the material's yield strength and indicates plastic deformation of 2.91 mm.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Perletakan, Seafastening, Tegangan, Topside, Transportasi, Placement, Seafastening, Stress, Topside, Transportation
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM1 Ballast (Ships) V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM761 Stability of ships
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Gian Gregoryous Sitompul
Date Deposited:	18 Jul 2025 02:25
Last Modified:	18 Jul 2025 02:25
URI:	http://repository.its.ac.id/id/eprint/119970

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