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首页> 外文会议>International conference on ocean, offshore and arctic engineering;OMAE2010 >A PRELIMINARY STUDY UNVEILING THE CONCEPT OF HEMISPHERICAL HULL STRUCTURE FOR FPSOs - WITH SPECIAL EMPHASIS ON FATIGUE DAMAGE
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A PRELIMINARY STUDY UNVEILING THE CONCEPT OF HEMISPHERICAL HULL STRUCTURE FOR FPSOs - WITH SPECIAL EMPHASIS ON FATIGUE DAMAGE

机译：FPSO的半球形船体结构概念的初步研究-特别强调疲劳损伤

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摘要

FPSOs, moored permanently at deep seas, are more vulnerable to fatigue failures due to cyclic loads from environmental conditions and operating cycles. In welded structures, the fatigue crack initiation strongly depends on the structural geometry and the stress concentration. In this work, a parent conventional hull is taken and an equivalent hemispherical hull, which could be a refined shape hull structure with smooth transition joints, is created with equal volumes. In both the hulls, the common critical location selected for comparison is a stiffener on central girder of the hull structures and the fatigue damage at full load and ballast load conditions are calculated, for design life of 25 years, by using simplified fatigue assessment procedure and S-N curve. It is observed that the hemispherical hull structure components have higher fatigue capacity than the conventional hull structure.
机译：永久停泊在深海的FPSO，由于来自环境条件和运行周期的周期性载荷而更容易遭受疲劳破坏。在焊接结构中，疲劳裂纹萌生在很大程度上取决于结构的几何形状和应力集中。在这项工作中，采用了常规的父级船体，并以相等的体积创建了等效的半球形船体，该船体可以是具有平滑过渡缝的精致形状的船体结构。在两种船体中，用于比较的共同关键位置是船体结构中央梁上的加劲肋，并通过简化的疲劳评估程序计算了设计寿命为25年的满载和压载载荷条件下的疲劳损伤。 SN曲线。可以看出，半球形的船体结构部件具有比常规船体结构更高的疲劳能力。

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