Space temperature field and structure response of multi-chamber cabin subjected to fire

Abstract

Ship structures may collapse or suffer serious deformation when subjected to fire. To accurately assess the structure safety of ships undergone fires, based on large eddy simulation of fire dynamics algorithm and the structural thermo-mechanical coupling response method, a thermal-mechanical coupling data interface is established. Taking a multi-chamber cabin as an example, the spatial temperature field of cabin under fire was studied, and the structural temperature load was obtained by using the 3D spatial temperature field data as the boundary. On this basis, the structural response of multi-chamber cabin subjected to fire was investigated, and the prediction model of residual bearing capacity of cabin was proposed. The space temperature of the fire source layer is greatly affected by the ventilation conditions, and the temperature fluctuation at the stair shaft is large due to the chimney effect. The stress and deformation of multi-chamber cabin under ambient temperature and fire are compared to reveal their different damage mechanism. Moreover, the residual bearing capacity of the cabin is positively correlated with the fire power, and the ultimate strength of the cabin within 0–4 MW is predicted.