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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/45021

Title: Correlation of Plastic Strain Energy and Acoustic Emission Energy in Reinforced Concrete Structures
Authors: Sagasta, Francisco
Benavent Climent, Amadeo
Roldán, Andrés
Gallego, Antolino
Issue Date: 2016
Abstract: This paper presents a comparison of the acoustic emission (AE) energy and the plastic strain energy released by some reinforced concrete (RC) specimens subjected to cyclic or seismic loadings. AE energy is calculated, after proper filtering procedures, using the signals recorded by several AE low frequency sensors (25–100 kHz) attached on the specimens. Plastic strain energy is obtained by integrating the load displacement curves drawn from the measurements recorded during the test. Presented are the results obtained for: (i) two beams (with and without an artificial notch) and a beam-column connection subjected to several cycles of imposed flexural deformations; (ii) a reinforced concrete slab supported by four steel columns, and a reinforced concrete frame structure, both of the latter are subjected to seismic simulations with a uniaxial shaking table. The main contribution of this paper, which is a review of some papers previously published by the authors, is to highlight that, in all cases, a very good correlation is found between AE energy and plastic strain energy, until the onset of yielding in the reinforcing steel. After yielding, the AE energy is consistently lower than the plastic strain energy. The reason is that the plastic strain energy is the sum of the contribution of concrete and steel, while the AE energy acquired with thresholds higher than 35 dBAE captures only the contribution of the concrete cracking, not the steel plastic deformation. This good correlation between the two energies before the yielding point also lends credibility to the use of AE energy as a parameter for concrete damage evaluation in the context of structural health monitoring.
Sponsorship: This research received financial support from the local government of Spain, Consejería de Innovación, Ciencia y Tecnología, projects P07-TEP-02610 and PE12-TEP-02429, from the Spanish National Plan for Scientific Research, Development and Technological Innovation (projects BIA 2005-00591 and DPI 2006-02970), and from the Formación del Profesorado Universitario (FPU) Program of Spain’s Ministry of Education, Culture and Sports (AP2010-2880).
Publisher: MPDI
Keywords: Acoustic emission
Reinforced concrete structures
Earthquakes
Damage evaluation
URI: http://hdl.handle.net/10481/45021
ISSN: 2076-3417
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Sagasta, F.; et al. Correlation of Plastic Strain Energy and Acoustic Emission Energy in Reinforced Concrete Structures. Applied Sciences, 6(3): 84 (2016). [http://hdl.handle.net/10481/45021]
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