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Earthquakes and Structures Volume 24, Number 5, May 2023 , pages 333-343 DOI: https://doi.org/10.12989/eas.2023.24.5.333 |
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Influence of the deteriorated anti-seismic devices on seismic performance and device behavior of continuous girder bridges |
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Shangtao Hu, Renkang Hu, Menggang Yang and Dongliang Meng
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| Abstract | ||
| Various seismic isolation and reduction devices have been applied to suppress the longitudinal vibration of continuous girder bridges. As representative devices, lead rubber bearing (LRB) and fluid viscous damper (FVD) might suffer from deterioration during the long-term service. This study aims to evaluate the impact of device deterioration on the seismic responses of continuous girder bridges and investigate the seismic behavior of deteriorated LRBs and FVDs. Seismic performance of a simplified bridge model was investigated, and the influence of device deterioration was evaluated by the coefficient of variation method. The contribution of LRB and FVD was assessed by the Sobol global sensitivity analysis method. Finally, the seismic behaviors of deteriorated LRBs and FVDs were discussed. The result shows that (i) the girder-pier relative displacement is the most sensitive to the changes in the deterioration level, (ii) the deterioration of FVD has a greater effect on the structural responses than that of LRB, (iii) FVD plays a major role in energy dissipation with a low degradation level while LRB is more essential in dissipating energy when suffering from high degradation level, (iv) the deteriorated devices are more likely to reach the ultimate state and thus be damaged. | ||
| Key Words | ||
| continuous girder bridge; deterioration; fluid viscous damper; lead rubber bearing; seismic behavior | ||
| Address | ||
| Shangtao Hu: 1) National Engineering Research Center of High-Speed Railway Construction Technology, Central South University, Changsha, PR China, 2) DisasterPrevention Research Institute, Kyoto University, Kyoto, Japan Renkang Hu, Menggang Yang and Dongliang Meng: National Engineering Research Center of High-Speed Railway Construction Technology, Central South University, Changsha, PR China | ||