UR S11A对船体梁波浪载荷长期极值的影响研究

Influence of UR S11A on Long-Term Extreme Value of Wave Induced Load on Hull Girder

2016年7月1日起生效的新版UR S11A以提升集装箱船结构安全为目标,替代了之前的版本UR S11。论文对UR S11A和UR S11中关于船体梁波浪载荷长期极值的计算公式和技术背景进行了比较。以已经交付运营或正在建造中的14型不同尺度集装船为分析数据库,对这两个规范在确定波浪载荷长期极值中的应用进行对比研究。然后以一型超大型集装船为算例,用基于线性波浪载荷的谱分析法、基于非线性波浪载荷的等效设计波法和非线性等效设计海况法等三种长期极值预报方法,对船舯区域垂向波浪弯矩进行计算,并分析它们与规范值之间的差异。总结UR S11A对船体梁的波浪载荷长期极值的影响,也为集装箱船波浪载荷设计极值的确定提供参考和建议。

In view of enhancing structural safety of container ships,the newly proposed UR S11A has come into effect since July 1,2016 to replace the original UR S11.In this paper,we firstly compare formulas and technical background of UR S11 and UR S11A in extreme value of long-term wave induced load on hull girder.Comparative research on the two different rules is implemented with 14 different scales of container ships in operation or under-construction.The mid-ship vertical bending moment of a container ship induced by waves is evaluated with three methods i.e.spectral analysis method,nonlinear equivalent design wave method,and nonlinear equivalent design sea state method.Comparison between these methods and the rule method is outlined,which provides some references for practical design.