半潜式钻井平台撑杆结构极限承载力数值仿真计算

Numerical simulation on ultimate strength of brace of semi-submersible platform

船舶与海洋工程结构设计已从传统的许用应力设计向极限状态设计转变,研究其极限承载能力及损伤变形模式,并确定结构设计的真实裕度,已成为结构理性设计的核心和基础.文中利用数值仿真软件Abaqus,采用弧长法(Riks方法)分析了深水半潜式钻井平台撑杆结构在横开、横关载荷状态下的极限承载力及结构失效模式,并比较研究了不同初始缺陷对结构极限承载力的影响.分析结果表明:横开与横关状态下结构的失效模式不同;不同初始缺陷对撑杆结构的极限承载力产生了一定程度的影响,随着初始缺陷的增加,结构极限承载能力降低.

Structural design of ship and ocean engineering has changed from traditional allowable stress design to ultimate limit state design. Research on the ultimate bearing capacity, deformation mode, and the determination of true margin of structural design, has become the core and foundation of structural rational design. With the help of numerical simulation software Abaqus, and using arclength method （ Riks method）, We analyze the ultimate bearing capacity and failure mode of deepwater semisubmersible drilling platform cross-brace structure in the laterally opened and closed loading conditions. The comparative study is carried out of the influence of differ- ent initial defects on structure ultimate bearing capacity. The results show that the structure failure modes are dif- ferent in the two loading conditions, different initial defects affect the structure ultimate bearing capacity to some extent, and the structure ultimate bearing capacity decreases with the increase of initial defects.