A calculation method for the digital twin of aging jacket platforms within the digital healthcare engineering framework

Offshore jacket platforms operate for extended periods in harsh marine environments, during which a series of aging-related defects may occur in their structures, leading to reduced load-bearing capacity. Efficient computation of environmental loads and residual ultimate strength, enabling real-time monitoring of safety levels, is critical to ensuring their safe operation. However, existing computational methods suffer from systemic weaknesses and low efficiency, and there is also a lack of effective approaches for analyzing defects in aging structures. To address these issues, A calculation method for the digital twin of aging jacket platforms within the Digital Healthcare Engineering (DHE) framework is proposed, aimed at enabling efficient analysis of environmental and defect parameters obtained from on-site measurements. Specifically, an environmental load computation framework is established based on surrogate models, Morison equation, and wave theories, while a residual ultimate strength computation framework is developed using multi-scale finite element models, nonlinear finite element analysis, and structural defect simulation methods. This approach forms a standardized analytical workflow that balances computational accuracy and efficiency, reduces computation time, and enables effective analysis of monitoring data. The effectiveness of the proposed method is validated using a case study of a specific jacket platform. • A calculation method for the digital twin of aging jacket platforms within the digital healthcare engineering framework is proposed. • An environmental load calculation method based on surrogate models, Morison equation, and wave theory is proposed. • A residual ultimate strength calculation method based on multi-scale finite element models is proposed.