新型海底整平清淤平台总强度分析的关键技术

Key Technologies of Global Strength Analysis of a New Type Platform Used for Seabed Desilting and Leveling

深中通道建设采用了中部大月池开孔的回字形浮式平台用于海底整平清淤工作,基于整平清淤平台的设计开发,分析确定回字形浮体结构设计的控制载荷工况,预报各控制设计工况的波浪载荷,并计算各工况下平台的结构总强度,探讨回字形浮式结构设计应关注的重点关键区域。梳理针对该类型浮式结构总强度直接计算的方法。结果表明,对于带有大开口的回形浮式结构,总强度计算中应重点关注结构整体扭转工况,结构设计中可采用在浮体角隅处设置抗扭箱型结构提高整体的抗扭能力。该研究可为回字形浮式结构或相似海洋工程结构物的结构设计提供参考。

For the construction of Shenzhen to Zhongshan undersea tunnel, the homocentric squares shaped floating platform with central moon pool is used for the seabed desilting and leveling. Based on the design of the platform, the control load cases are analyzed, and the wave loads forecasting is carried out corresponding to every control load case respectively, the global structure strength of the floating platform is calculated through design wave method, and the critical structure areas and issues need to be pay attention are discussed for the floating platform. The direct calculation method for the total strength of this type of floating structure is summarized. The results show that for the homocentric squares shaped floating structure with large central moon pool, the overall torsional condition of the structure should be focused in the calculation of total strength, and the antitorque box structure at the corner of the platform can be used in the structure design to improve the overall torsional capacity. It provides a guide on homocentric squares shaped or similar type floating structure design.