Dynamic characteristics of Seohae cable-stayed bridge based on results from long-term structural health monitoring

This paper presents the long-term dynamic characteristics of a cable-stayed bridge where installed the SHM (Structural Health Monitoring) system. Modal parameters such as natural frequencies and mode shapes were identified from the modal analysis using the three-dimensional finite element model. The modal parameters of the developed baseline model have a good correlation with those identified from field ambient vibrations. By the analysis of correlations between the measured natural frequencies and temperatures, it was found the natural frequency was in linearly inverse proportion to the temperature. Mode shapes were extracted from the TDD (Time Domain Decomposition) technique for ambient vibration measurements. Finally, these results demonstrate that the TDD technique can apply to identify modal parameters of large-scaled bridges.