Application of Nonlinear Ultrasonic Method for Monitoring of Stress State in Concrete

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As the lifespan of concrete structures increases, their load carrying capacity decreases owing to cyclic loads and long-term effects such as creep and shrinkage. For these reasons, there is a necessity for stress state monitoring of concrete members. Particularly, it is necessary to evaluate the concrete structures for behavioral changes by using a technique that can overcome the measuring limitations of usual ultrasonic nondestructive evaluation methods. This paper proposes the use of a nonlinear ultrasonic method, namely, nonlinear resonant ultrasonic spectroscopy (NRUS) for the measurement of nonlinearity parameters for stress monitoring. An experiment compared the use of NRUS method and a linear ultrasonic method, namely, ultrasonic pulse velocity (UPV) to study the effects of continuously increasing loads and cyclic loads on the nonlinearity parameter. Both NRUS and UPV methods found a similar direct relationship between load level and that parameter. The NRUS method showed a higher sensitivity to micro-structural changes of concrete than UPV method. Thus, the experiment confirms the possibility of using the nonlinear ultrasonic method for stress state monitoring of concrete members.
Publisher
한국비파괴검사학회
Issue Date
2016-04
Language
Korean
Article Type
Article
Citation

비파괴검사학회지, v.36, no.2, pp.121 - 129

ISSN
1225-7842
DOI
10.7779/JKSNT.2016.36.2.121
URI
http://hdl.handle.net/10203/213913
Appears in Collection
CE-Journal Papers(저널논문)
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