基于非线性动力学的自升式平台/船舶碰撞结构损伤分析

Structural damage analysis during collision between jack-up and ship based on non-linear dynamic method

海洋平台遭遇船舶碰撞时会危及其整体安全,但更多是造成严重的局部损伤,需修理,导致工作停滞及经济损失。与固定式平台相比,自升式平台柔性更大,结构冗余度更低,其碰撞危害性尚未受到重视,国内也少见相关研究。基于非线性动力学分析方法,以某300 ft工作水深的自升式平台为例,提出一种考虑初始状态和剩余强度的自升式平台/船舶碰撞结构分析方法。并考察各种撞击参数对平台结构损伤和动力响应影响,结论可为自升式平台抵抗意外载荷进行结构设计提供参考。

The integer safety of offshore installations may be endangered when collision between installations and vessels happens. Even if serious local damage is caused by collision only, repairing should lead to work breaking and economical losses. Comparing with jackets, jack-ups are much more flexible and have a much lower level of redundancy, but its collision danger has not been paid sufficient attention. At present, there is few study on this subject in our country based on non-linear dynamic analysis methods. Here, taking a 300ft jack-up as an example, one approach of analyzing collision process between jack-up and vessel considering the initial state of the jack-up and its residual strength was put forwarded. Furthermore, the influence of impact parameters on its structural damage and dynamic response was considered. The results were helpful to structural design of jack-ups against accidental loads.