极端海冰作用下海洋平台－自复位摇摆新型结构振动破坏机理及设计方法研究

Jacket offshore platform structures are complex, large, and expensive. Their surrounding ocean environment is complicated and harsh.The sea ice load is the control load for design in Bohai sea.The collapse accidents of ocean platform happened many times in recent years because of sea ice load, and caused huge economic losses and casualties, and caused oil spills that impact extremely bad environment.Therefore,the safety of ocean platform is very important.Rocking structure is a newly-developed structural system in recent years and able to reduce the seismic effect and structural damage. It can be used after earthquake with less repair or even without repair. This project proposes two novel high disaster prevention and mitigation performance, resilient and dual structure systems:Jacket offshore platform with rocking structural system and jacket offshore platform with self-centering rocking structural system. Theoretical analysis together with experimental study will be used to investigate (1) the rocking structure's construction for offshore platform, the self-centering rocking structure for jacket offshore platform in marine environment,(2) to study vibration damage mechanism and energy dissipation mechanism of two new systems subjected to sea ice load, (3) to establish damping design methods of jacket offshore platform based on rocking structure and self-centering rocking structure,to establish design methods of jacket offshore platform based on rocking structure, and (4) to propose design methods of jacket offshore platform based on self-centering rocking structure. It is anticipated that the results of this project will promote the application of the new offshore platform structure. The new ideas are put forward for reinforcement of both new and abandoned jacket offshore platform structures and to provide technical support and security for China's offshore oil and gas resources' sustained, steady development in shallow sea. In summary, this project is important and significant not only in theoretical development but also in practical applications.

导管架海洋平台结构体积庞大、造价昂贵，所处海洋环境十分恶劣，其中海冰荷载是渤海湾等近海的设计控制荷载。近年来发生过多次海洋平台被海冰推倒事故，造成了重大经济损失和人员伤亡，并且会引发漏油事故。摇摆结构是最近几年兴起的结构形式，可减少结构的破坏，使其震后稍加修复或不需修复即可投入使用。本项目针对极端海冰等破坏荷载提出可抵御极端恶劣荷载的海洋平台-摇摆结构体系和海洋平台-自复位摇摆结构体系两种新型高防灾减灾性能、可恢复功能的双重抗侧力结构体系，将采用理论分析和试验研究相结合的方法，研究适合海洋平台结构的摇摆柱、自复位摇摆柱，研究基于两种结构体系的海洋平台耗能损伤机理，研究两种结构体系在极端海冰下的破坏机理，建立基于两种体系的海洋平台设计方法。本课题的研究将对新建海洋平台和即将废弃海洋平台加固提出了新思路，为我国海洋油气资源开发的持续稳步发展提供技术支撑和保障，具有重要理论意义和实际意义。

导管架海洋平台结构体积庞大、造价昂贵，所处海洋环境十分恶劣，其中海冰荷载是渤海湾等近海的设计控制荷载。近年来发生过多次海洋平台被海冰推倒事故，造成了重大经济损失和人员伤亡，并且会引发漏油事故。摇摆结构是最近几年兴起的结构形式，可减少结构的破坏，使其震后稍加修复或不需修复即可投入使用。本项目针对极端海冰等破坏荷载提出了可抵御极端恶劣荷载的海洋平台-摇摆柱结构体系、海洋平台-双摇摆柱结构体系以及海洋平台-自复位摇摆柱结构体系三种新型高防灾减灾性能、可恢复功能的双重抗侧力结构体系，采用理论分析和试验研究相结合的方法，进行了海洋平台-摇摆柱体系抗冰理论分析，开发了适合海洋平台结构的摇摆柱、自复位摇摆柱，进行了摇摆柱结构构造设计及摇摆柱抗剪试验，进行了扇形铅粘弹性阻尼器的设计及试验研究，进行了基于海洋平台MTMD抗冰振分析，进行了海洋平台-摇摆柱结构体系抗冰振参数优化，研究了基于三种结构体系的海洋平台耗能损伤机理，研究了三种结构体系在极端海冰下的破坏机理，建立了基于三种体系的海洋平台设计方法。本课题的研究对新建海洋平台和即将废弃海洋平台加固提出了新思路，为我国海洋油气资源开发的持续稳步发展提供技术支撑和保障，具有重要理论意义和实际意义。