The paper titled “Deep learning-based real-time multiload response prediction and inverse analysis of offshore bridges” has been published in Engineering Structures.
Offshore bridges operate in complex ocean environments, making structural analysis, design, and monitoring more challenging. Conventional time-history analysis and nonlinear model updating based on finite-element methods are computationally intensive and time-consuming, which limits their use in many scenarios. To develop a more efficient analytical tool, this study proposes a deep learning-based offshore bridge predictor, DeepOBP. By integrating structural characteristics with coupled dynamic loads in ocean environments, DeepOBP enables millisecond-level, high-precision nonlinear dynamic offshore bridge response predictions. Building on this surrogate model, a differentiable structural inverse framework (Inverse DeepOBP) is further developed, coupling the predictor with gradient-based optimization to support rapid damage identification and model calibration for structural health monitoring.
Experimental results show that DeepOBP achieves high accuracy under both normal operating conditions and multi-hazard coupled conditions, with R² = 0.93 and 0.92, respectively. Inverse DeepOBP delivers more than a 10-fold speed-up over surrogate-based model updating using a heuristic algorithm, and more than a 10⁴-fold speed-up over nonlinear finite-element model updating, while maintaining relative errors below 7% for each identified parameter. These results demonstrate the potential of the proposed framework for efficient structural analysis and real-time monitoring of offshore bridges.
Note: Engineering Structures is a Q1 journal in the Engineering and Technology field, with a 2025 impact factor of 6.4. The first author of the paper is Master’s student Zhuyu Sun, and Prof. Yutao Guo is the corresponding author. This work was supported by the National Key Research and Development Program of China and the Shenzhen Science and Technology Program.