泄漏油气燃爆灾害下FPSO结构响应分析

为评估FPSO泄漏油气燃爆事故中结构损伤风险，采用等效TNT法结合AUTODYN软件分析结构在爆炸冲击波下动态响应，分析其塑性、变形及应力分布，评估不同工况下结构损伤程度。结果表明，TNT起爆后冲击波高速传播，10ms时已覆盖工艺I区，经反射叠加耦合后破坏力增强；原油热处理器和电脱盐器发生失效和变形，生产甲板边缘位置受约束较小，发生较大变形，部分区域屈曲破坏；参与反应的油气越多，相同结构等效应力及变形越大，大应力、大变形区域分布越广；d=60mm时部分结构完全失效。

Analysis on structural response of FPSO subjected to deflagration hazard of leaking oil and gas

Given the high risk about structural damage of FPSO subjected to deflagration hazard resulted by leaking oil and gas, the structural dynamic response under blast wave was studied by combining equivalent TNT method and AUTODYN. The characteristics of elastic-plastic state, displacement and stress distribution of structure were analyzed in details, and the degree of structural damage under different deflagration conditions was evaluated. The results showed that the blast wave propagates around in high speed after TNT initiation, and it takes only 10 ms for blast wave to cover the whole area of processing module direct . The reflection of equipments and coupling superposition effect enhances the destructive power of blast wave greatly. The crude oil thermal theater and electric clipper desalter are vulnerable to suffering the failure damage and whole displacement. The large displacement and plastic deformation occurs in edge region of process deck, and part of structure suffers buckling failure. The more oil and gas leaks, the greater equivalent stress and displacement of structure in same position are, and the wider regional distribution with large stress and displacement becomes. When the leakage aperture is 60 mm, some structure fail completely.