Experimental Study on Displacement Reconstruction of Jacket Structures Based on Static Condensation Inverse Finite Element Method
To address the demand for real-time deformation monitoring of offshore fixed jacket structures, this paper presents an experimental study on displacement reconstruction based on the Static Condensation Inverse Finite Element Method (iFEM-S). A scaled jacket model was constructed and subjected to dynamic loading. An inverse finite element model, incorporating both the main structure and substructures, was established using inverse beam elements. Experimental validation confirms the effectiveness of iFEM-S under realistic operational conditions. The study also analyzes the impact of model fabrication errors, sensor installation deviations, and environmental noise on reconstruction accuracy. The results demonstrate that iFEM-S can effectively monitor the global and substructural responses of jacket platforms. Although local deformations near tubular joints lead to a slight overestimation of reconstructed values, the algorithm exhibits robust performance overall. This research provides experimental support and a theoretical reference for digital health monitoring and high-fidelity state assessment of offshore engineering structures.