Abstract:

In order to accurately analyze mechanical behavior of ship engine room structures under real fire conditions and address insufficiency of traditional standard fire temperature-time curve technique, a coupling analysis method of fire, heat and structural mechanics by combing FDS with ANSYS was proposed. FDS was employed to simulate real fire, and time-varying temperature field information near inner walls of ship engine rooms was obtained, which was used as the inputting variable and transmitted to structural mechanical behavior simulator ANSYS. Then, temperature load of cabin structure was loaded and transient thermal analysis was carried out, thermal mechanical coupling calculation was performed. Finally, by changing fire source position, mechanical response characteristics of cabin structures under different fire source positions were investigated. The results show that stress distribution of the structures is uneven under different fire location scenarios, and the maximum temperature stress is 76 MPa when fire height is 2 m. Fire safety design should focus on cases of non-uniform heating of structures in real fire.

Key words: fire location, ship engine room, fire-thermal-structural coupling, real fire, fire dynamic simulator (FDS)