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Assessment of Resistance of a Damaged Member Jacket Type Offshore Platform to Boat Impact

[+] Author Affiliations
Banafsheh Naderi

Oregon State University, Corvallis, OR

A. A. Aghakouchak

TArbiat Modares University, Tehran, Iran

Paper No. IMECE2011-65788, pp. 571-577; 7 pages
doi:10.1115/IMECE2011-65788
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 9: Transportation Systems; Safety Engineering, Risk Analysis and Reliability Methods; Applied Stochastic Optimization, Uncertainty and Probability
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5495-2
  • Copyright © 2011 by ASME

abstract

In many optimized offshore platforms, initial failure of a member seldom represents the ultimate capacity of the structure. This is due to the fact that this type of structure possesses strength reserves beyond those recognized in traditional design. It is observed that although the damage in members may does not play an important role in the ultimate strength of the structure in a nonlinear static analysis, it may have an important effect on structural performance in vessel collision. The principle objective of this paper is to assess how damage in members within the splash zone may increase the vulnerability of platform in the event of ship impact. The structure under study is a Production Platform jacket located in Persian Gulf. The loading on the structure includes functional and environmental loads. The analysis is carried out under displacement control. In this paper, first, the structure is evaluated by pushover analysis in intact and damaged conditions. Therefore, the jacket is subjected to impact from a conventional supply vessel. Subsequently, the ability of the damaged structure to dissipate impact energy is investigated and is compared with that of the intact condition. Two types of damage namely “Local Denting” and “Out of Straightness” as well as total removal of critical members are considered.

Copyright © 2011 by ASME

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