万箱集装箱船典型货舱结构极限承载能力计算

随着世界货运量的需求增加,集装箱船的大型化发展从未停止。近十年内,有2艘大型集装箱船先后在海上遭到极端载荷而丧失结构承载能力以致发生灾难性毁坏,给航运界敲响了警钟。为了避免今后大型集装箱船再次遭遇上述严重事故,保证营运中使用的安全性和航行时结构的可靠性,国际船级社协会专门针对集装箱船的规范要求进行修改,提高了载荷设计值,并且要求评估典型货舱结构的极限承载能力。本文针对万箱集装箱船典型货舱结构,基于逐步破坏法和有限元法,计算了垂向和水平方向的极限弯矩。结果表明,在初步设计阶段逐步破坏法有着快速高效的优势,但是考虑到载荷变化的多样性和船体结构的复杂性,还是需要应用非线性有限元法进行建模计算,给出最终评估结果。

Ultimate Limit State on the Typical Hold Structures of 10,000TEU Container Ship

With the increase in the demand of the world"s cargo volume, the enlargement of container ships has never stopped. In the past decades, two large container ships have suffered extreme loads at sea and then lost their structural capacity so as to cause catastrophic damage. As a result, the shipping industry has sounded the alarm. In order to avoid the above serious accidents once again in the future and to ensure the safety in operation and the reliability of the structure, IACS has revised the unified requirement of the container ships specifically to increase the design loads, and required assessment of the ultimate strength of a typical cargo hold structure. Aiming at the typical cargo hold structure of 10,000 container ships, in this paper, the ultimate bending moment in vertical and horizontal direction have been calculated based on the progressive collapse method and the finite element method. The results show that the progressive collapse method has the advantage of fast and high efficiency in the preliminary design stage. However, considering the diversity of load changes and the complexity of the hull structure, the nonlinear finite element method is required from modeling calculation to the final assessment.