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Emerging technologies for Nondestructive Evaluation of bridges and highways
| 题名： | Emerging technologies for Nondestructive Evaluation of bridges and highways |
| 作者： | Thomas, G. H.; Benson, S. E.; Del Grande, N. K.; Haskins, J. J.; Schneberk, D. J. |
| 关键词： | Bridges; Roads; Inspection; Nondestructive Testing; Aging; Cables; Computerized Tomography; Crack Propagation; Safety; Ultrasonic Testing |
| 摘要： | The Nondestructive Evaluation (NDE) Section of the Lawrence Livermore National Laboratory has worked with the Federal Highway Administration (FHWA) and California Transportation Administration (Caltrans) to find solutions to inspection of aging bridges and highways. As an example of the magnitude of the aging infrastructure problem, the United States has over 500,000 miles of steel girders in bridges to inspect. In California, there are 26,000 bridges, approximately 3000 are steel, and of the steel bridges 1000 are fracture critical. Fracture critical bridges, those that will fail if a critical member fails, must be inspected routinely to ensure their safety. Corrosion and fatigue damage are two of the major problems that require routine assessment to determine extent of damage. We have developed ultrasonic methods for inspecting bridge pins, limited view computed tomography for inspecting bridge cables and cable anchors, and we are developing infrared imaging methods for inspecting bridge decks. We have proposed NDE solutions to a number of inspection problems that including: (1) evaluating concrete damage with ultrasonic, radiographic, and electromagnetic techniques; (2) assessing bridge scour with acoustic imaging technology; (3) monitoring crack growth with acoustic emission; and (4) determining moisture and salt accretion, intemal strain, and state of cure in concrete with embedded sensors, |
| 总页数： | 14p |
| 报告类型： | 科技报告 |
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