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All Journal OISAA Journal of Indonesia Emas Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Jurnal Penelitian Enjiniring Fakultas Teknik Unhas Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Maritime Park: Journal Of Maritime Technology and Socienty Makara Journal of Technology Riset Sains dan Teknologi Kelautan
Muhammad Zubair Muis Alie
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Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Transportation

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Journal : Makara Journal of Technology

 1 
Residual Strength Analysisof Asymmetrically Damaged Ship Hull GirderUsing Beam Finite Element Method Alie, Muhammad Zubair Muis
Makara Journal of Technology Vol. 20, No. 1
Publisher : UI Scholars Hub

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The objective of the present study is to analyze the residual strength of asymmetrically damaged ship hull girder under longitudinal bending. Beam Finite Element Method is used for the assessment of the residual strength of two single hull bulk carriers (Ship B1 and Ship B4) and a three-cargo-hold model of a single-side Panamax Bulk Carrier in hogging and sagging conditions. The Smith’s method is adopted and implemented into Beam Finite Element Method. An efficient solution procedure is applied; i.e. by assuming the cross section remains plane, the vertical bending moment is applied to the cross section and three-cargo-hold model. As a fundamental case, the damage is simply created by removing the elements from the cross section, neglecting any welding residual stress and initial imperfection. Also no crack extension is considered. The result obtained by Beam Finite Element Method so-called Beam-HULLST is compared to the progressive collapse analysis obtained by HULLST for the validation of the present work. Then, for the three-hold-model, the Beam-HULLST is used to investigate the effect of the rotation of the netral axis both intact and damage condition taking the one and five frame spaces into account.
Investigation of Ship Hull Girder Strength with Grounding Damage Alie, Muhammad Zubair Muis; Adiputra, Ristiyanto
Makara Journal of Technology Vol. 22, No. 2
Publisher : UI Scholars Hub

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The objective of the present study is to investigate ship hull girder strength as a result of grounding damage upon longitudinal bending. A bulk carrier and tanker are analyzed and Smith’s Method is adopted and implemented in the analysis program. An efficient solution procedure is performed by assuming the cross-section remains plane and the vertical bending moment is applied to the cross section. As a fundamental case, the damage is simply created by removing the elements from the cross section. Welding residual stress, initial imperfections, and crack extensions are not considered. The grounding damage is made by two conditions, namely those are placed at the center part of the cross section and those located at an asymmetric position. To determine the ultimate strength, which includes the progressive collapse behavior of ship hull with damage, the simply supported scenario is imposed to the cross section and hogging and sagging conditions are taken into account. The results obtained for intact and damage conditions by the in-house program are compared with one another to observe the collapse behavior in advance.
Effects of Collision Damage on the Ultimate Strength of FPSO Vessels Alie, Muhammad Zubair Muis; Ramasari, Dian; Rachman, Taufiqur; Adiputra, Ristiyanto
Makara Journal of Technology Vol. 24, No. 1
Publisher : UI Scholars Hub

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Floating production storage offloading (FPSO) vessels are movable offshore structures. These structures are designed with large dimensions, and their decks are loaded with several types of equipment. During collision damage, the hull and deck parts loaded with equipment are severely affected. Therefore, the ultimate strength of FPSO vessels should be thoroughly checked and evaluated. The objective of the present study is to analyze the ultimate strength of FPSO vessels against collision damage characterized by hogging and sagging under longitudinal bending. The cross section of an FPSO vessel is modeled with elements composed of stiffened and unstiffened plates. The vessel length is assumed to occupy one frame space. The ultimate strength of FPSO vessels against collision damage is determined by performing a numerical analysis under hogging and sagging conditions. Multipoint constraint is applied to both sides of the cross section, and the material properties are set to be constant. Collision damage is represented by the loss of element stiffness, and it represents the percentage of the ship’s depth. For the extent of transversal damage, B/16 is set to be constant. The minimum and maximum collision damages are taken as 10% and 60% of the ship’s depth, respectively. Numerical results show that the ultimate strength of FPSO vessels and their bending stiffness decrease under collision.
Co-Authors ., Ashury Adiputra, Ristiyanto Alamsyah Andalan, Muhammad Teguh Perdana Anwar Anwar Arafat, Andi Muhammad Alfian Ashury - Ashury, Ashury Aski, Salsabila Assidiq, Fuad Mahfud Assidiq, Fuad Mahfud Chairul Paotonan Daeng Paroka Firman Husain Firman Husain Fitri Ramadhani Ganding Sitepu Habibi Palippui Hasdinar Umar Imam Ismail Juswan - Juswan . Juswan, Juswan Martinus Padaunan, Alfred Michael Phady, Adriani Rajmi, Astika Ramasari, Dian Sabaruddin Rahman Sagita, Rian Samsu Dlukha N Suci, Indah Melati Suyono Suyono Syerly Klara Taufiqur Rachman