Dynamic Performance Assessment and Model Updating of Cable-Stayed Poyang Lake Second Bridge Based on Structural Health Monitoring Data

Abstract

Structural health monitoring (SHM) systems are very useful for evaluating the performance of bridges in service. In this paper, the SHM system implemented on the Poyang Lake Second Bridge is investigated, and the monitored data are analyzed for performance evaluation, damage identification, and model updating of the bridge. First, the measured data are examined for environmental effects, structural behaviour, and modal identification. Based on the bridge construction information, a finite element (FE) model is constructed for the cable-stayed bridge. Subsequently, the regularized model updating approach is employed to calibrate the constructed numerical model by using the measured modal data. Several vibration-based methods for structural damage identification are proposed to inversely identify the simulated damage within the cable-stayed bridge using the test data. The results indicate that the measured structural responses, such as cable forces and bridge deck deflections, vary over time and highlight discrepancies in the initial FE model. This FE numerical model can then be effectively adjusted using the proposed model updating method, which enhances the connection between the real cable-stayed bridge and the modified FE numerical model. From the modal data, the simulated damage in the main structural members of the cable-stayed bridge can be correctly identified using the proposed methods.