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Publications
Shetty, N. and Guedes Soares, C. (1997), “Fire Reliability of Skeletal and Plated Structures in Offshore Structures”, Advances in Safety and Reliability, Guedes Soares, C. (Ed), Pergamon, Vol. 2 pp. 1407-1414
The paper presents a methodology for reliability analysis of offshore topside structures under pool and jet fire conditions. The methodology has been developed by integrating models for fire loading, heat transfer and non-linear structural response with the modern methods of structural reliability analysis. Three different limit-states have been considered covering both plated and skeletal type of structures: (i) exceedance of critical temperature of a component, (ii) structural collapse of a component, and (iii) progressive collapse of a structural framing. The methodology accounts for the uncertainties in fuel properties, release conditions, environmental parameters, thermal properties of the steel and the insulation and the uncertainties involved in the sub-models used for the flame geometry, heat flux calculation, heat transfer and structural response evaluation. The failure probabilities are calculated using first and second order (FORM/SORM) methods for component and system reliability analysis. The methodology proposed here could be used for evaluating the probability of failure of systems such as the module support frame, drilling derrick, bridge, process piping and vessels, fire/blast walls, deck plating etc., as illustrated using examples.
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