科研之友
微信
新浪微博
Facebook
分享链接
摘要
Aiming at the structural damage of jack-up platform caused by punch-through, a systematic study of dynamic catastrophic behavior was conducted. Structural component failure criteria was proposed considering the impact of damage accumulation on stiffness degradation. Additionally, platform overall failure criteria was proposed based on the definition of structural resistance and foundation resistance. Taking a 121 m truss jack-up platform as an example, an overall analysis model was established considering pile-soil coupling and components damage evolution. The model applicability was testified from three aspects, i. e., foundation bearing capacity, damage effect and constraint condition. Furthermore, the dynamic catastrophic evolution model of jack-up platform under the punch-through condition was investigated based on overall failure criteria. Results show that components damage evolution can reduce the ultimate bearing capacity of platform and affect its overall catastrophic evolution. Pile-soil coupling can be effectively simulated using CEL method under complex stratum conditions. For bow leg punch-through conditions, the failure mode is subjected to the combined effect of structural resistance and foundation resistance. Plastic deformation occurs in the connection area of stern leg and spudcan due to hull inclination. A change occurs as the punch-through depth increased, i. e., the buckling of leg located in the area near upper and lower guide block, which is consistent with observations in the jack-up platform after punch-through.
- 出版日期2016
- 单位中国石油大学（华东）
