Optimized Fire Protection for Offshore Topside Structure with 3-Sides PFP Application

摘要

For the deck structure of offshore platform, PFP (Passive Fire Protection) is generally applied on 3-sides of primary member excluding the top surface of upper flange. It is due to the ease of installation and maintenance although there is a high possibility that all 4-sides of the member could be exposed to direct or indirect thermal input. Therefore, in this paper, performance of 3-sides PFP is verified to ensure the integrity of topside structure when all sides of primary members receive thermal load. According to the results, most part of the members still retained enough margins although the strength of top flange is significantly decreased. If any fracture of a member is reported, thickness of its 3-sides PFP is increased and then the integrity of this member remains almost intact. Since the thickness of PFP is determined based on the section factor of each member, modified section factor approach could be introduced to adopt thicker 3-sides PFP, which delays the strength reduction of the partly protected member against fully engulfed fire.