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<p>The hull structure may collapse or deform severely under fire conditions. In this study, the safety of a ship’s cabin structure under fire is evaluated using a dual-zone large eddy fire scenario simulation method and a sequential thermo-mechanical coupling analysis method. Taking a three-compartment section of a naval surface ship as a case study, a machinery room fire scenario was simulated and the fire temperature field was analyzed. Through a dedicated data interface, the full-field time-varying temperature loads were mapped to the finite element model of the compartment section, thereby achieving thermo-mechanical coupled analysis of the cabin structure. The effects of thermal expansion on the hull structure under rising fire temperatures were considered in the evaluation of the residual load-bearing capacity of the cabin. The results indicate that the residual load-bearing capacity of the compartment is closely linked to the fire development stage. Temperature not only significantly affects the mechanical properties of steel but also influences the structural load-bearing capacity through thermally stresses.</p>

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Simulation Analysis of Thermal Load and Ultimate Bearing Capacity of Hull Girder Under Cabin Fire

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Chenfeng Li,
  • Guanchen Wei,
  • Zixiong Kang,
  • Houyao Zhang,
  • Xueqian Zhou

摘要

The hull structure may collapse or deform severely under fire conditions. In this study, the safety of a ship’s cabin structure under fire is evaluated using a dual-zone large eddy fire scenario simulation method and a sequential thermo-mechanical coupling analysis method. Taking a three-compartment section of a naval surface ship as a case study, a machinery room fire scenario was simulated and the fire temperature field was analyzed. Through a dedicated data interface, the full-field time-varying temperature loads were mapped to the finite element model of the compartment section, thereby achieving thermo-mechanical coupled analysis of the cabin structure. The effects of thermal expansion on the hull structure under rising fire temperatures were considered in the evaluation of the residual load-bearing capacity of the cabin. The results indicate that the residual load-bearing capacity of the compartment is closely linked to the fire development stage. Temperature not only significantly affects the mechanical properties of steel but also influences the structural load-bearing capacity through thermally stresses.