基于模型修正的桥梁结构性能推演研究OA

To use long-term monitoring data to assess the health of bridge structures and deduce the degree of structural degradation,an initial design model of the bridge was constructed based on engineering drawings.This model was then refined using modal frequency as an objective function to establish an operational model that reflects actual bridge conditions.Based on this refined model and combining monitoring data with on-site inspection,the causes of structural stiffness degradation were identified and quantified through model updating theory.A bridge performance prediction method based on model updating was proposed.The study results indicate that the updated operational model more accurately represents the bridge's actual performance,with predicted performance trends aligning closely with measured data.Through on-site inspections,it was further confirmed that the main cause of structural degradation is the reduction in the effective cross-section of the box girder.The proposed method significantly improves the accuracy of urban bridge performance analysis,providing essential technical support for real-time monitoring and maintenance decision-making.