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Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 790586, 15 pages
http://dx.doi.org/10.1155/2013/790586
Research Article

Plastic and Elastic Responses of a Jacket Platform Subjected to Ship Impacts

1State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2State Key Lab of Structure Analysis for Industrial Equipment, Dalian 20240, China
3Deepwater Engineering Key Laboratory, Technology Research Department CNOOC Research Institute, Beijing 20240, China

Received 29 June 2013; Accepted 9 August 2013

Academic Editor: Song Cen

Copyright © 2013 Liang Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper deals with ship-jacket platform collisions. An examination on NORSOK N-004 rule is carried out. Furthermore, elastic and plastic response of jacket platform is studied. This paper also conducts a sensitivity analysis, focusing on collision points. Simulation models of a ductile and a rigid supply vessel were developed, as well as models of two typical jacket platforms. Data such as collision force, kinetic energy, and deformation energy have been obtained. Several conclusions have been drawn: NORSOK rule underestimates the resistance for certain indention, due to inaccurate description of column deformation mode. Elastic response is extremely important in dynamic analysis of ship-platform impacts, by contributing to reducing impact loads and local energy dissipation. Struck members are therefore subjected to impacts to a low extent, which can be regarded as result of a buffering effect. Before a buffering effect works, a time delay exists. This is caused because the topside has to take up adequate kinetic energy. Striking position has an effect on dynamic behavior of platform. High local strength is in favor of buffering an effect. Elastic response is more significant in a flexible platform than in a sticky one.