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Past-Eartquake Damage Evaluation of Bridge Structures.
| 题名： | Past-Eartquake Damage Evaluation of Bridge Structures. |
| 作者： | ANDERSON, N.; CHEN, G.; ENGEBAWY, M.; LUNA, R.; SILVA, P.; STEPHENSON, R.; ZOUGHI, R. |
| 关键词： | *Earthquakes-; *Bridges-Structures; *Damage-assessment.;Highways-; Columns-; Beams-; Seismic-design; Retrofitting-; Reinforced-concrete; Earthquake-engineering; Ground-motion; Hazards-; Loads-Forces; Methodology-; Structural-analysis. |
| 摘要： | Bridges, as important components of civil infrastructure, particularly column members and beam-column joints in substructures, are vulnerable to lateral earthquake loading. Immediately after a major earthquake event, the most pressing need is to send emergency vehicles and rescue teams to the affected areas. To meet the urgent need, all bridges along a predesignated emergency vehicle access route have to be evaluated within several hours, if not sooner, to ensure the bridges are safe for emergency vehicles. The current practice, visual inspections of the structural condition of highway bridges, often leads to overconservative conclusions. A decision could be made to close a bridge when it is still capable of carrying reduced traffic loads. More important, damage such as excessive cracks in reinforced concrete (RC) columns is often undetectable under a moderate earthquake event since gravity load will close the cracks immediately after the event. A quantitative method is therefore needed as a complementary tool to make a more sensible decision on the condition of those bridges that is undetectable or unclear from visual inspections. |
| 报告类型： | 科技报告 |
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