东海4腿导管架平台极限承载能力分析

Ultimate Bearing Capacity Analysis of a 4-Legged Jacket Platform in the East China Sea

摘要: 以我国东海某4腿现役导管架平台为研究对象，采用SACS对该平台进行有限元建模，分析了平台所受基本载荷与环境载荷作用。通过非线性倒塌分析方法，综合考虑海生物附着厚度和结构腐蚀等因素，对平台进行了极限承载能力评估。结果分析表明，从不同方向对平台施加载荷，平台的极限承载能力有所差异，载荷从平台坐标系0˚、90˚、180˚、270˚ 4个方向作用时的强度储备系数较其他方向小；在考虑海生物不同厚度对平台的作用后，平台各方向的强度储备系数发生了明显下降。不同倍数的原始海生物厚度将导致强度储备系数不同程度的下降，当厚度为原始厚度2倍时，平台各方向的强度储备系数下降最大。

Abstract: Taking an in-service four-legged jacket platform in the East China Sea as the research object, this study established a finite element model of the platform using SACS and analyzed the basic and environmental loads acting on the structure. Through nonlinear collapse analysis, the ultimate bearing capacity of the platform was evaluated, with comprehensive consideration of marine growth thickness and structural corrosion. The results indicate that the platform’s ultimate bearing capacity varies under loads from different directions. Specifically, the strength reserve factors are relatively lower when the loads act along the 0˚, 90˚, 180˚, and 270˚ directions of the platform coordinate system compared to other directions. After taking into account the effects of marine organisms of different thicknesses on the platform, the strength reserve coefficients of the platform in various directions have shown a significant decline. Different multiples of the original thickness of marine organisms will result in different degrees of reduction in the strength reserve coefficients. When the thickness is twice the original value, the strength reserve coefficients of the platform in all directions experience the most substantial decline.