Journal article
Use of Interwire Ultrasonic Leakage to Quantify Loss of Prestress in Multiwire Tendons
Journal of engineering mechanics, v 137(5), pp 324-333
01 May 2011
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
This paper presents a technique developed on the basis of ultrasonic guided waves to monitor prestress levels in multiwire prestressing strands. The transducer layout identified for stress measurement is composed of an ultrasound excitation provided by a piezoelectric element bonded on a peripheral wire. Ultrasound detection is performed on the central and peripheral wires at the strand’s end. The ultrasonic feature used for stress monitoring is the interwire leakage between the peripheral and the central wire, occurring across the strand anchorage. A semianalytical finite-element analysis is first used to predict modal and forced wave solutions in seven-wire strands as a function of the applied prestress level. The numerical analysis accounts for the changing interwire contact as a function of applied loads and predicts the attenuation occurring in loaded strand when the wave travels across the anchorage. Results of load monitoring in free strands during laboratory tests are then presented. Finally, a statistical approach is used to enhance the sensitivity of the technique to stress level in the strands. The study presented focuses on unbonded tendons. However, the final goal of the research is to monitor prestress loss in bonded tendons that are found in the majority of the bridges built in California.
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Details
- Title
- Use of Interwire Ultrasonic Leakage to Quantify Loss of Prestress in Multiwire Tendons
- Creators
- Ivan Bartoli - Drexel UniversitySalvatore Salamone - Drexel UniversityRobert Phillips - Drexel UniversityFrancesco Lanza di Scalea - Univ. of California, San Diego , NDEand Structural Health Monitoring Laboratory, Dept. of Structural Engineering, , 9500 Gilman Dr., La Jolla, CA 92093-0085Charles S Sikorsky - Drexel University
- Publication Details
- Journal of engineering mechanics, v 137(5), pp 324-333
- Publisher
- American Society of Civil Engineers
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Web of Science ID
- WOS:000290439900002
- Scopus ID
- 2-s2.0-79955733538
- Other Identifier
- 991019168784604721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Mechanical