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Evaluation of Durability and Wear Characteristics of Viscous Fluid Dampers for Seismic Bridge Retrofits with Significant & Sustained Traffic Loadings, Santiago Creek Damper Tests.
| 题名： | Evaluation of Durability and Wear Characteristics of Viscous Fluid Dampers for Seismic Bridge Retrofits with Significant & Sustained Traffic Loadings, Santiago Creek Damper Tests. |
| 作者： | Kad, B.; Benzoni, G. |
| 关键词： | Structural health monitoring, Vincent Thomas Bridge (VTB), Santiago Creek Dampers, Vincent Thomas Bridge, Viscous dampers, In-service damper movements |
| 摘要： | In summer 2012 Caltrans replaced a set of six fluid viscous dampers at the Santiago Creek bridge after the earlier set installed in 1997 were reported to be leaking fluid. The recovered dampers were subsequently sent to UCSD for further testing and evaluation for durability and wear. This study extends an earlier examination of de-installed leaking dampers from the Vincent Thomas Bridge (VTB) that were found to exhibit significant component wear of the seals, bearing assemblies. It is anticipated that fluid loss likely results in a loss of operational capability. The dampers were retested in two stages: Stage I testing performed at 10.5ips in April 2015. Subsequently dampers were retested in Stage II at 41.6ips in September 2015. Upon retesting, the dampers are found in satisfactory operating condition and ‘all’ dampers passed the current multiple qualification criterion outlined by Caltrans. Proof testing at 10.5ips (stage I) and subsequently at fully rated 41.6ips (stage II) suggests that despite the large differences in visual appearance of fluid leakage in dampers, the performance characteristics are similar; any differences are rather subtle and no clear distinction could be drawn regarding the operating functionality of the damper from visual examination alone. In fact visual assessments often singled out the wrong dampers as possibly impaired. Thus, while a visual inspection of leakage may be sufficient concern for heightened monitoring – they may not warrant replacement as they lack any thorough qualification procedure. |
| 报告类型： | 科技报告 |
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