Vol 24, No 1 (2020) > MJT Intl Meeting on Collaborative Technologies >

Effects of Collision Damage on the Ultimate Strength of FPSO Vessels

Muhammad Zubair Muis Alie 1 , Dian Ramasari 1 , Taufiqur Rachman 1 , Ristiyanto Adiputra 2

Affiliations:

  1. Faculty of Engineering, Department of Ocean Engineering, Universitas Hasanuddin, Makassar 90245, Indonesia
  2. Faculty of Engineering, Kyushu University, Fukuoka, 819-0395, Jepang

 

Abstract: FPSO is Floating Production Storage Offloading, one of the offshore structures with movable characterized. The structure is designed with huge dimension consisting many equipment at deck part. When the collision damage takes place, not only hull received the impact, but also deck part with many equipment placed on that. Therefore, this event must be checked and evaluated for the ultimate strength. The objective of the present study is to analyze the ultimate strength of FPSO due to collision damage in hogging and sagging conditions under longitudinal bending. The cross section of FPSO is modeled having elements composed stiffened and unstiffened plates. For the length of ship is assumed to be one frame space. The ultimate strength of FPSO due to cillision damage is conducted by performing numerical analysis in hogging and sagging conditions. The Multi Point Constraint is applied to both sides of the cross section and the material properties are set to be constant. The collision damage is represented by lost of the element stiffeness and it represent by the percentage of the ship’s depth. For the transversal damage extend, B/16 is set to be constant. The collision damages are taken as 10% and 60% of ship’s depth for minimum and maximum, respectively. It is obtained that the ultimate strength caused by collision obtained by numerical solution is decreased including their bending stiffness.
Keywords: FPSO, cross-section, collision damage, hogging-sagging, ultimate strength
Published at: Vol 24, No 1 (2020) pages: 1-6
DOI:

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