摘要
为减少自升式平台穿刺造成的损失,需要对自升式平台穿刺过程中的结构响应进行研究。根据某典型平台图纸,使用有限元法建立细化模型。在穿刺过程中采用CONNECTOR单元及非线性弹簧模拟自升式平台围阱区的齿轮齿条接触及桩土作用。考虑到模型中包含的高度非连续过程,穿刺过程采用显式动力学方法求解。通过分析模型穿刺后的结构形态,危险点分布,穿刺速度对结构的影响及预压载值的变化,探讨自升式平台穿刺过程中的结构响应特征。结果表明:平台导向板附近桩腿结构最容易在穿刺中损坏;穿刺速度对与桩靴相连的桩腿结构影响很大;为减少穿刺对结构的影响,可以考虑主动刺穿或减少气隙进行单桩预压载等措施。
In order to reduce the loss in the punch-through accident of Jackup,the structural response of Jackup during punch-through needs to be studied.A detailed model is established based on a typical Jackup with Finite Element Method（FEM）.CONNECTOR element and non-linear spring are used to simulate the leg/hull connection and spudcan-soil interaction.Considering the non-linearity contained in this model,time domain analysis is conducted with explicit analysis method for punch-through.Through analyzing the shape change of hull and leg after punch-through,the distribution of dangerous points,effects of punch-through speed on the structure and changes of preload,some structural response characteristics of punch-through are determined.The study demonstrates：pile leg structure around guiding plate is most easily damaged and punch-through speed has great influence on the pile leg structure strength connected to spudcan.To reduce the loss caused by punch-through,the measures are suggested according to the analysis,such as active punch through or preloading under smaller in gap.
出处
《海洋工程》
CSCD
北大核心
2013年第3期24-30,共7页
The Ocean Engineering
基金
国家"863"高技术研究发展计划资助项目(2008AA092701-3)
关键词
自升式平台
穿刺
有限元法
显式方法
结构响应
Jackup
punch-through
finite element method
explicit analysis
structural response
