超大型集装箱船艏艉砰击强度直接计算方法

超大型集装箱船的船艏显著外飘、船艉宽平外悬,使其在恶劣海况下航行时容易发生严重的砰击。为确保船体艏艉部结构在砰击中不发生损坏,需要研究作用到艏艉外板上的砰击压力,并以此为设计载荷来校核外板和相连结构的强度。目前对集装箱船砰击局部强度的校核要求仍以经验公式为主,但是为提高对超大尺度船舶强度校核的可靠性,近年来推出了砰击的直接分析方法。本文初步分析了砰击直接分析方法的基本原理,并运用该方法对20,000 TEU集装箱船的艏、艉部砰击压力以及最小板厚要求进行了研讨,其结果可为超大型集装箱船的结构设计提供重要的参考。

ULCS Bow Flare Impact and Stern Slamming Direct Calculation Study

s: With significant bow flare, overhanging stern, ultra large container ship (ULCS) in rough sea is easily subject to severe wave slamming and impact. In order to protect bow and stern hull structure from damage, designed wave slamming and impact pressure should be determined in ship structure planning phase, shell plate and adjacent hull structure shall be strengthened accordingly to against this impacted load. Normally, the empirical formula is used for local strength checking. And in recent few years, based on latest study, some kinds of direct analysis method are introduced for very big size ship like ULCS to achieve more reliable result. This paper primarily analyzes the fundamentals of slamming direct analysis method, and takes 20,000 TEU container ship as an example to discuss bow flare impact and stern slamming pressure and relevant minimum plate requirements. This research provides important reference in ULCS structure planning design.