[2004] Design Principles and Criteria for Ship Structures under Dynamic Pressure Loads Arising from Sloshing, Slamming and Green Seas > Selected Papers

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Selected Papers

[2004] Design Principles and Criteria for Ship Structures under Dynami…

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Presented at the 2004 SNAME Annual Meeting, Washington, DC, 29 September – 2 October, 2004
Transactions - Society of Naval Architects and Marine Engineers
2004, Vol. 112 (10 ref.), pp. 292-313



Design Principles and Criteria for Ship Structures under Dynamic Pressure Loads Arising from Sloshing, Slamming and Green Seas


Author(s): Jeom Kee Paik, Jae Myung Lee, Yung Sup Shin and Ge Wang



Abstract:
The present paper deals with design principles and criteria for ship structures under dynamic pressure loads due to sloshing, slamming and green seas. In contrast to the authors’ previous SNAME annual meeting papers (Paik et al. 2000, 2001), which dealt with buckling and ultimate strength of ship structures under extreme static / quasi-static loads, the present paper develops strength criteria of ship structures against dynamic pressure loads. The characteristics of dynamic pressure loads caused by sloshing in liquid cargo tanks of ships, by slamming on bottom / bow flare structures, or by green seas on deck structures are addressed in terms of the pressure pulse-time history. Dynamic structural failure behavior of ship stiffened plate structures is examined using LS-DYNA3D code with varying the characteristics of dynamic pressure loads. Closed-form formulations for predicting permanent deflection of plating, stiffened panels and grillages (cross-stiffened panels) are derived applying the energy principles, and their validity is checked by a comparison with the LS-DYNA3D computations and existing test results when available. The design criteria of ship structures against dynamic pressure loads are then established so that the permanent deflection of ship structures is less than the target value. It is concluded that the strength criteria developed will provide a more refined basis for ship structural design because they reflect dynamic pressure, in contrast to current class rules that are primarily based upon the concept of equivalent quasi-static pressure. The insights and results developed from the present study are summarized.

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