Fracture Mechanism and Damage Evaluation of FRP/Steel–Concrete Hybrid Girder Using Acoustic Emission Technique
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 7
Abstract
The damage monitoring and evaluation of a fiber-reinforced polymer (FRP)/steel–concrete hybrid box girder subjected to four-point bending is reported in this paper. The target is to integrate the improved mechanical behavior of a FRP/steel-concrete girder with acoustic emission (AE) response. The damage growth and the failure mechanism of the structure are investigated with AE parametric analysis. The amplitude distribution analysis can successfully discriminate the macrodamage signals from the microdamage signals. The time-dependent dynamic analysis of extended features, including RA-AF, b-value, damage parameters, and bending stiffness, show great potential in evaluating damage states, identifying critical points, and providing warnings for catastrophes. The favorable correlation between cumulative AE energy and local strain response provides a viable alternative for meaningful local damage monitoring and prediction. The synthesis analysis of multiple indicators overcomes the disadvantages of single-indicator parameters in to determining complex damage properties, identifying instant damage status, and providing critical warning information for composite structures.
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Acknowledgments
The authors are grateful for the financial support from the National Key Research and Development Program of China (Project No. 2017YFC0703410), and the National Natural Science Foundation of China (NSFC) under Grant Nos. 51478079 and 51778104.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 7 • July 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 13, 2018
Accepted: Jan 15, 2019
Published online: Apr 29, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 29, 2019
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