Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Fire Resistance Characteristics of Firewall Structure Associated with Impact Damage Induced by Explosion

  • Hye Rim Cho (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Jeong Hwa Yoo (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Jung Kwan Seo (Department of Naval Architecture and Ocean Engineering and The Korea Ship and Offshore Research Institute, Pusan National University)
  • Received : 2023.02.06
  • Accepted : 2023.06.22
  • Published : 2023.06.30
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Abstract

When a fire accident accompanied by an explosion occurs, the surrounding firewalls are affected by impact and thermal loads. Damaged firewalls due to accidental loads may not fully perform their essential function. Therefore, this paper proposes an advanced methodology for evaluating the fire resistance performance of firewalls damaged by explosions. The fragments were assumed to be scattered, and fire occurred as a vehicle exploded in a large compartment of a roll-on/roll-off (RO-RO) vessel. The impact velocity of the fragments was calculated based on the TNT equivalent mass corresponding to the explosion pressure. Damage and thermal-structural response analyses of the firewall were performed using Ansys LS-DYNA code. The fire resistance reduction was analyzed in terms of the temperature difference between fire-exposed and unexposed surfaces, temperature increase rate, and reference temperature arrival time. The degree of damage and the fire resistance performance of the firewalls varied significantly depending on impact loads. When naval ships and RO-RO vessels that carry various explosive substances are designed, it is reasonable to predict that the fire resistance performance will be degraded according to the explosion characteristics of the cargo.

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Acknowledgement

Some part of this study was presented in the 2022 Ocean Engineering CAE competition of the Korean Society of Ocean Engineers (KSOE).

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