Multiple Crack Detection of Concrete Structures Using Impedance-based Structural Health Monitoring Techniques |
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Authors: | S Park S Ahmad C-B Yun Y Roh |
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Institution: | (1) Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, South Korea;(2) School of Mechanical Engineering, Kyungpook National University, Daegu, 702-701, South Korea |
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Abstract: | This paper presents a feasibility study for practical applications of an impedance-based real-time health monitoring technique applying PZT (Lead–Zirconate–Titanate) patches to concrete structures. First, comparison between
experimental and analytical studies for damage detection on a plain concrete beam is made. In the experimental study, progressive
surface damage inflicted artificially on the plain concrete beam is assessed by using both lateral and thickness modes of
the PZT patches. Then, an analytical study based on finite element (FE) models is carried out to verify the validity of the
experimental result. Secondly, multiple (shear and flexural) cracks incurred in a reinforced concrete (RC) beam under a third
point bending test are monitored continuously by using a sensor array system composed of the PZT patches. In this study, a
root mean square deviation (RMSD) in the impedance signatures of the PZT patches is used as a damage indicator. |
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Keywords: | Impedance PZT Structural health monitoring Multiple crack detection Finite element analysis Concrete structures |
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