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海上导管架平台的极限承载能力是平台结构安全评估的重要依据。文中建立了考虑导管架-水泥浆体-桩组合作用的精细化有限元模型,采用Pushover方法对平台的极限承载能力进行评估,同时考虑了腐蚀、裂缝和地基被冲刷等因素对服役后期平台极限承载能力的影响。利用验证后的模型对平台设计状态以及服役后期的承载能力进行了比较。结果表明:水泥浆体可使平台整体刚度和承载力提高,而服役后期承载能力和初始设计状态相比将有较大降低。考虑水泥浆体的组合作用可使初期刚度和位移角为1%时的承载力分别提高12.6%和8.4%,极限承载能力最大提高约3%,在腐蚀、裂缝和地基被冲刷等因素作用下结构极限承载能力最大降幅可达29.6%。
The ultimate bearing capacity of the offshore jacket platform is an important basis for the safety assessment of the platform structure. In this paper, a refined finite element model considering the combination of jacket-grout-pile is established in this paper. Pushover method is used to evaluate the ultimate bearing capacity of the platform, taking into account factors such as erosion, cracks and ground erosion, Influence of carrying capacity. The validated model was used to compare the design status of the platform with the carrying capacity of the later stage of service. The results show that the cement slurry can increase the overall stiffness and bearing capacity of the platform, while the bearing capacity at the later stage of service will be greatly reduced compared with the initial designed state. Taking into account the combined action of cement paste, the bearing capacity at initial stiffness and displacement angle of 1% can be increased by 12.6% and 8.4% respectively, and the ultimate bearing capacity can be increased by about 3% at maximum. Under the action of erosion, cracks and foundation erosion The maximum limit of structural ultimate carrying capacity can drop by 29.6%.