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Stress Level Measurement in Prestressed Steel Strands Using Acoustoelastic Effect

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Abstract

In-situ health monitoring of the tensioning components such as strands, tendons, bars, anchorage bolts, etc. used in civil engineering structures, namely bridges, dams, nuclear power plants, etc. is extremely important to ensure security of users and environment. This paper deals with a guided ultrasonic wave procedure for monitoring the stress levels in seven-wire steel strands (15.7 mm in diameter). For this purpose, simplified acoustoelastic formulations were derived from the acoustoelasticity theory and acoustoelastic measurements were performed. The results from acoustoelastic calibration tests and an anchorage block of seven-wire steel strands are presented and discussed. They show the potential and the suitability of the proposed guided wave method for evaluating the service stress levels in the prestressed seven-wire steel strands.

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Acknowledgements

This research was funded by the National Agency of Researches (ANR) and Electricité De France (EDF) within the framework of a national research program (ACTENA-France/ANR-05-PGCU-003) concerning the diagnostic assessment of inaccessible prestressed cables. This program brings together 15 French research centers (13 university laboratories and two industrial partners). Collaborations with all of partners are greatly appreciated. The authors would like to thank Hervé Demouveau, research engineer at the laboratory, for his invaluable engineering skills and technical assistance while contributing to the mechanical experimental set-up.

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  1. Département Technologie des Polymères et Composite et Ingénierie Mécanique (TPC & IM), Ecole des Mines de Douai, 941 Rue Charles Bourseul, B.P. 10838, 59508, Douai Cedex, France

    S. Chaki & G. Bourse

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  1. S. Chaki
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  2. G. Bourse
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Correspondence to S. Chaki.

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Chaki, S., Bourse, G. Stress Level Measurement in Prestressed Steel Strands Using Acoustoelastic Effect. Exp Mech 49, 673–681 (2009). https://doi.org/10.1007/s11340-008-9174-9

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  • DOI: https://doi.org/10.1007/s11340-008-9174-9

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