(8)An analytical method to assess the damage and predict the residual strength of a ship in a shoal grounding accident scenario

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Sun Bin ^a, Hu Zhiqiang ^a,∗, Wang Jin ^a,b, Yu Zhaolong ^c
a State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China
^bCOTEC USA, Houston, USA
^c Dept. of Marine Technology, Norwegian University of Science and Technology, Trondheim, Norway
Received 22 May 2015; received in revised form 19 August 2015; accepted 18 September 2015
Available online 14 March 2016

Abstract
   In this paper, a simplified analytical method used to predict the residual ultimate strength of a ship hull after a shoal grounding accident is proposed. Shoal grounding accidents always lead to severe denting, though not tearing, of the ship bottom structure, which may threaten the global hull girder resistance and result in even worse consequences, such as hull collapse. Here, the degree of damage of the bottom structure is predicted by a series of analytical methods based on the plastic-elastic deformation mechanism. The energy dissipation of a ship bottom structure is obtained from individual components to determine the sliding distance of the seabed obstruction. Then, a new approach to assess the residual strength of the damaged ship subjected to shoal grounding is proposed based on the improved Smith’s method. This analytical method is verified by comparing the results of the proposed method and those generated by numerical simulation using the software ABAQUS. The proposed analytical method can be used to assess the safety of a ship with a double bottom during its design phase and predict the residual ultimate strength of a ship after a shoal grounding accident occurs.
© 2016 Shanghai Jiaotong University. Published by Elsevier B.V.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords: Shoal grounding; Residual strength; Simplified analytical method; Numerical simulation; Damage analysis.