Ultrasonic Wave Propagation in Progressively Loaded Multi-Wire Strands |
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Authors: | P Rizzo |
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Institution: | (1) NDE & Structural Health Monitoring Laboratory, Department of Structural Engineering, University of California, 9500 Gilman Drive, M.C. 0085, La Jolla, San Diego, CA 92093-0085, USA |
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Abstract: | In recent years methods based on guided ultrasonic waves gained increasing attention for the nondestructive evaluation and
the health monitoring of multi-wire strands used in civil structures as prestressing tendons and stay cables. The study of
wave propagation properties in such components has been challenging due to the load-dependent inter-wire contact and the helical
geometry of the peripheral wires. The present paper addresses an experimental investigation on the ultrasonic wave propagation
in seven-wire strands loaded at different stress levels. Wafer piezoelectric sensors are employed in a through transmission
configuration for the generation and detection of stress waves. The response of the lowest-order longitudinal mode is studied
at different levels of load. Those ultrasonic features, associated with the transmitted ultrasonic energy, sensitive to the
variation of applied load are identified and discussed as possible means of a load monitoring. |
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Keywords: | Ultrasonic methods Steel Multi-wire Strands Prestressed concrete Tendons Structural Health Monitoring |
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