[2002] Predicting Resistance of Spherical-Type LNG Carrier Structures to Ship Collisions > Selected Papers

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Selected Papers

[2002] Predicting Resistance of Spherical-Type LNG Carrier Structures …

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Marine Technology
Vol. 39, No. 2, pp. 86-94,  April 2002

Predicting Resistance of Spherical-Type LNG Carrier Structures to Ship Collisions

Author(s): Jeom Kee Paik, Ick Hung Choe and Anil Kumar Thayamballi

Abstract:
  The modern design of steel structures uses limit states classified into four types, namely, serviceability limit state, ultimate limit state, fatigue limit state and accidental limit state. The aim of this paper is to propose and illustrate a procedure to assess the capability of a spherical-type LNG carrier of 135000m3 to resist ship collisions. An assessment procedure based on the energy dissipation capability relating to structural crashworthiness can, in this case, be applied to protect spherical LNG cargo tanks from fracture in minor or moderate collision accidents as shown in the paper. In the procedures developed, while the loss of kinetic energy during the collision accident is approximately estimated by applying the momentum equilibrium of the two implicated ships, a series of relatively sophisticated numerical computations is undertaken to simulate the structural crashworthiness of the object ship in the full load condition at standstill, varying the loading conditions and types of the striking ship, when the LNG carrier side structure is considered to be struck by the bow of either a VLCC or another LNG carrier. Based on the computed results, the collision resistance indices (CRI), which in the present study are defined as a function of the ratio of the structural energy dissipation capability to the initial kinetic energy loss, are calculated for the objectship for various collision scenarios. Some important insights useful for preventing collision damage of the spherical LNG cargo tanks of the ship are also discussed.

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