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27 March 2018 Neutral axis determination of full size concrete structures using coda wave measurements
Hanwan Jiang, Hanyu Zhan, Chenxu Zhuang, Ruinian Jiang
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Proceedings Volume 10599, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII; 1059907 (2018) https://doi.org/10.1117/12.2295763
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2018, Denver, Colorado, United States
Abstract
Coda waves experiencing multiple scattering behaviors are sensitive to weak changes occurring in media. In this paper, a typical four-point bending test with varied external loads is conducted on a 30-meter T-beam that is removed from a bridge after being in service for 15 years, and the coda wave signals are collected with a couple of sources-receivers pairs. Then the observed coda waves at different loads are compared to calculate their relative velocity variations, which are utilized as the parameter to distinct the compression and tensile zones as well as determine the neutral axis position. Without any prior knowledge of the concrete beam, the estimated axis position agrees well with the associated strain gage measurement results, and the zones bearing stress and tension behaviors are indicated. The presented work offers significant potential for Non-Destructive Testing and Evaluation of full-size concrete structures in future work.
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Hanwan Jiang, Hanyu Zhan, Chenxu Zhuang, and Ruinian Jiang "Neutral axis determination of full size concrete structures using coda wave measurements", Proc. SPIE 10599, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII, 1059907 (27 March 2018); https://doi.org/10.1117/12.2295763
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KEYWORDS
Receivers
Bridges
Inspection
Interferometry
Wave propagation
Multiple scattering
Nondestructive evaluation
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