深水导管架平台抗台风极限承载能力

针对台风引起的甲板上浪问题，采用API模型与Stokes 5th波原理确立上浪载荷计算方法与流程，基于Pushover分析原理，提出广义储备强度系数GRSR以用于服役平台环境条件改变时的承载能力评估。在此基础上，以某深水导管架平台为研究对象，考虑固支与桩-土非线性作用两种边界约束，计算得到平台设计载荷下端向、斜向与侧向3种方向的承载能力曲线与塑性应变分布，并对其极限承载能力与失效模式的内在关系进行深入探讨；进一步考虑甲板上浪载荷作用对平台进行推覆分析，研究不同上浪高度下平台极限承载与失效模式。结果表明，上浪载荷导致平台极限承载能力降低，当上浪高度达到一定值时，平台塑性区集中于导管架顶部，主控失效模式演变为上部组块侧翻倒塌，这与台风后观察到的平台失效模式一致。研究成果可为中国深水导管架平台抗台风工程提供参考。

Typhoon-resistant ultimate bearing capacity of deep-water jacket platforms

For typhoon-induced wave-in-deck (WID) loads on fixed offshore structures, a calculation method and the procedure are established using the API hydrodynamic model and Stokes 5th wave theory. A generalized concept of reserve strength coefficient is proposed for assessing the bearing capacity of jacket platforms with environmental changes. Using a deep-water jacket platform as an example, the ultimate bearing capacity (UBC) curves and plastic strain distribution (PSD) of the design loads applied in three directions (end-on, broadside, and diagonal) are determined by considering two boundary constraints, i.e., clamped support and pile-soil nonlinear springs; further, the inherent relationship between the UBC and failure mode (FM) of the platform is investigated. Additionally, the WID loads at different heights are taken into account for pushover analysis of the UBC and FM of the platform. Results show that the WID load reduces the UBC of the platform; when the height of WID reaches a certain level, the PSD is concentrated to the top of the jacket while the main FM changes to topside rollover collapse. The results are consistent with our observations in the real platform after typhoon. This study valuable reference data is provided for assessing the anti-typhoon performance of deepwater jacket platforms.