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All Journal Riset Sains dan Teknologi Kelautan
Muhammad Zubair Muis Alie
Departemen Teknik Kelautan Universitas Hasanuddin
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Environmental Science Industrial & Manufacturing Engineering

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ANALISIS KEKUATAN ANCHOR CROWN SHACKLE PADA FPU MADURA STRAIT DENGAN VARIASI SUDUT MOORING LINE Imam Ismail; Daeng Paroka; Muhammad Zubair Muis Alie
Riset Sains dan Teknologi Kelautan Volume 4, Nomor 1, Tahun 2021
Publisher : Departemen Teknik Kelautan Fakultas Teknik Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/sensistek.v4i1.19395

Abstract

Floating produciton unit Madura Strait yang akan disingkat FPU adalah suatu struktur terapung yang berfungsisebagai unit produksi minyak dan gas yang akan diletakkan pada selat madura yang akan ditambatkan secaracatenary kepada jangkar di dasar laut. Selama pengoperasiannya FPU akan mengalami pergerakan secara terus menerus akibat hasil respon terhadap beban dinamis yang menghantamnya. Hal ini akan berisiko kepada gagalnya mooring line. Selain mooring line, kekuatan penyambung rantai juga menjadi salah satu struktur yang mesti diperhatikan, yaitu anchor crown shackle dan conecting link. Dalam penelitian kali ini bertujuan menganalisakekuatan dari anchor crown shackledan connecting link, yang didahulukan dengan mencari nilai tension terbesar dengan melakukan analisa time domain terhadap mooring line dengan variasi beberapa sudut antar mooring linepada kondisi ULS dan ALS. Hasil analisanya menunjukkan bahwa variasi sudut antar mooring line sebesar 5° adalah yang paling aman bagi FPU karena memiliki akumulasi nilai RAO yang rendah dan safety factor mooring line yang paling tinggi secara akumulasi dalam kondisi ALS dan ULS dibanding variasi yang lain. Untuk kekuatan anchor crown shackle dan connecting link, hasil analisa dengan menggunakan beban sebesar 2500kN akibat tension maksimum yang dihasilkan oleh mooring line pada kondisi ALS menunjukkan nilai tegangan maksimum 278.54 Mpa yang berarti nilainya lebih kecil dari 90% yield strength material (417.42 Mpa) dan deformasi terbesar 0.00024 m untuk anchor crown shackle dan 0.00034 untuk connecting link yang berarti masing – masing nilainya kurang dari 5% diameter struktur (0.01 m) sehingga struktur tersebut dapat dikatakan aman menurut standar yangdiizinkan oleh ABS.Kata kunci: FPU, tension, RAO, von mises stress, anchor crown shacle, connecting link.
ANALISIS PERILAKU PORTAL 3 DIMENSI PADA LEG SYSTEM TIPE JACKET TERHADAP BEBAN VERTIKAL MENGGUNAKAN METODE ELEMEN HINGGA DENGAN SAP2000 : Analisis Portal 3D pada Struktur Jacket Sitti Suhaeni Sarhani Rahman; Rakhmat Alghifari Arif; Arsa Aldani Saptarina; Muhammad Zubair Muis Alie
Riset Sains dan Teknologi Kelautan Volume 9, Number 1, Tahun 2026
Publisher : Departemen Teknik Kelautan Fakultas Teknik Universitas Hasanuddin

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Abstract

Jacket structures are a type of three-dimensional frame structure that is widely used in offshore structures to support vertical and lateral loads. Studies on the basic response of leg systems to pure vertical loads are important as a preliminary step before analyzing more complex environmental loads. This study aims to analyze the behavior of a three-dimensional portal structure on a jacket-type leg system using the SAP2000 finite element method. Modeling was performed on a 4-leg structure with diagonal and horizontal bracing using ASTM A992 steel cylindrical cross-sections. Vertical loads in the form of four concentrated loads of 1 kN each were applied to the top brace. The simulation results show a maximum displacement of Uz = 0.560 m, while the maximum lateral displacement is Ux/ Uy = 0.245 m. The maximum axial compressive force on the leg is 1059.44 kN, while the maximum tensile force is 7.41 kN. The maximum stress reaches 620.75 MPa on the center brace due to the concentration of stiffness and local moments. The maximum torsion of 3.42 kNm occurs as a result of the asymmetry of stiffness between elements. This study provides a basic understanding of global deformation, internal force distribution, and critical points of the jacket structure due to pure vertical loads and can be used as a basis for more complex analyses. Keywords: vertical load, structural deformation, FEM, jacket structure, SAP2000  
ANALISIS SENSITIVITAS FRAME 2D TIPE PORTAL TERHADAP VARIASI GEOMETRI DAN KONDISI BATAS DENGAN SAP2000: ANALISIS FRAME 2D TIPE PORTAL Muhammad Guntur Kasriady; Andi Aulia Novianti; Husnul Khotimah; Muhammad Zubair Muis Alie
Riset Sains dan Teknologi Kelautan Volume 9, Number 1, Tahun 2026
Publisher : Departemen Teknik Kelautan Fakultas Teknik Universitas Hasanuddin

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Abstract

This study examines the stiffness sensitivity of 2D portal-type frames to variations in geometry and boundary conditions using finite element analysis in SAP2000. Structural stiffness plays a critical role in determining deformation responses and internal force distribution, particularly in portal systems that are highly influenced by changes in element dimensions and support restraints. The portal model is analyzed under vertical and horizontal distributed loads of 10 kN/m to evaluate shear forces, bending moments, axial forces, and displacements. The analysis shows that the maximum shear force reaches 7,086 kN at the base of the column, while the largest moment occurs at the fixed support with a value of 20,673 kN·m. The axial forces in both columns are dominated by compression and remain relatively constant along their height, reflecting the significant influence of vertical loading. The maximum lateral displacement is approximately 0.202 m, which remains within acceptable limits for sensitivity analysis but still requires consideration of drift criteria for real design applications. These findings indicate that small changes in geometry and boundary conditions can produce meaningful variations in structural response, highlighting the importance of sensitivity studies during early design stages to achieve a more efficient and stable structural configuration. Keywords: 2D frame, structural stiffness, boundary conditions, SAP2000
Co-Authors Andi Aulia Novianti Arsa Aldani Saptarina Daeng Paroka Husnul Khotimah Imam Ismail Muhammad Guntur Kasriady Rakhmat Alghifari Arif Sitti Suhaeni Sarhani Rahman