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

Abstract

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.

Keywords

Ship and ocean engineering / Cabin fire / Fire simulation / Thermal load / Thermo-mechanical coupling analysis / Residual bearing capacity

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Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature