Non-Destructive Evaluation of South Temple (I-15) Bridge Structure Through Dynamic Characterization Using an Eccentric Mass Shaker

使用偏心质量振动台通过动态特性对南寺 (I-15) 桥梁结构进行无损评估

• 批准号: 9810684
• 负责人: Kevin Womack
• 金额: $ 3.8万
• 依托单位: Utah State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 1999-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9810684&HistoricalAwards=false
• 关键词: Non; Destructive; Evaluation; South; Temple

Over the next four years approximately 120 bridges will be destroyed and rebuilt as part of the 1-15 reconstruction through Salt Lake City, Utah. This is a rare opportunity to destructively test older bridge structures constructed in the 1960's. The researchers have been given access to a nine span bridge, the South Temple overpass bridge. This bridge will be accessible for testing on about March 1st, for a period of about six weeks. The availability of this bridge provides the initial opportunity to investigate the potential of using forced vibration analysis and dynamic characterization as a non-destructive evaluation technique. After the bridge has been damaged the dynamic characteristics will be redetermined. The damage in the structure should be manifest in the change of the natural frequencies and mode shapes from the undamaged to the damaged state of the bridge. This evaluation approach would be especially applicable to structures where damage might not be readily visible at the joint between a column and pile cap, or concrete structures where plastic hinges that form might not be immediately obvious or hidden by architectural coverings. This project is a test of an application of proven theories of structural dynamics.

在接下来的四年里，大约120座桥梁将被摧毁和重建，作为犹他州盐湖城1-15重建计划的一部分。这是一次难得的机会，可以对建于20世纪60年代的陈旧桥梁结构进行破坏性测试。研究人员已经获准进入一座九跨桥梁--南寺立交桥。这座大桥将于3月1日左右开放进行测试，为期约6周。这座桥的使用为研究使用强迫振动分析和动力特性作为一种非破坏性评估技术的潜力提供了初步机会。桥梁受损后，将重新确定其动力特性。结构的损伤应表现为桥梁自振频率和振型由未损伤状态到损伤状态的变化。这种评估方法将特别适用于柱和桩帽之间的连接处可能不容易看到损坏的结构，或者形成的塑性铰链可能不会立即明显或被建筑覆盖物隐藏的混凝土结构。这个项目是对结构动力学理论应用的一次测试。