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Lookup NU author(s): Professor Zhiqiang Hu
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
This paper presents a simplified analytical method for predicting the resistance of shipbottom structures when a ship runs aground over rock-type seabed obstructions. Duringthe powered grounding scenario, the structural damage caused by sharp seabed obstructionsmay lead to earlier penetration and serious consequences, such as compartmentflooding, oil leakage and environmental pollution. Therefore, it is of great importance torapidly and accurately analyse the response of a ship's bottom structure during poweredgrounding scenarios. A new simplified kinematically admissible analytical model is built tocapture the dominant failure modes of the bottom transverse floor, which include plasticbending and membrane stretching, and the analytical expression of the resistance of thebottom floor is derived from a plastic mechanism analysis. The failure mechanisms of thebottom plating are also analyzed to provide insight into the main deformation mechanismswith reasonable predictive accuracy. The analytical prediction method is verified bynumerical simulation using the code LS-DYNA. The simulation cases cover a wide range ofindentations and semi-apex angles of the cone-shaped rocks. The results agree well,proving that the proposed analytical method can be used to predict the ship bottomstructure crashworthiness during the structural design phase.
Author(s): Sun B, Hu Z, Wang J
Publication type: Article
Publication status: Published
Journal: Marine Structures
Print publication date: 01/07/2017
Online publication date: 25/04/2017
Acceptance date: 14/04/2017
Date deposited: 25/04/2017
ISSN (print): 0591-8339
ISSN (electronic): 1873-4170
Publisher: Elsevier Ltd
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