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Smart Structures and Systems Volume 34, Number 1, July 2024 , pages 1-8 DOI: https://doi.org/10.12989/sss.2024.34.1.001 |
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A study on transmission line configuration for structural health monitoring using electromagnetic waves |
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Dongsoo Lee, Dong-Ju Kim, Jinwook Kim, Jong-Sub Lee and Sang Yeob Kim
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| Abstract | ||
| Structural health monitoring (SHM) of concrete structures is necessary because structural safety is directly linked to life safety. This study proposes a transmission line configuration for SHM based on time domain reflectometry (TDR). For thispurpose, six transmission lines consisting of electrical wires, rebars, and joints were prepared. The TDR waveforms were measured and analyzed in air and concrete using six transmission lines to select the most suitable configuration. A two-line wire with joints was selected as the optimal transmission line for SHM because it exhibited the highest sensitivity among the configurations. Experiments to apply SHM were performed on defective concrete blocks containing an optimal transmission line. The results showed that the defect locations in concrete were precisely investigated using TDR waveform analysis. The distances estimated from the TDR waveform were similar to the measured distances for the locations of the defects and joints in the concrete blocks. This study suggests that a transmission line consisting of two-line wires and joints may be an effective nondestructive evaluation tool for assessing the structural health of concrete. | ||
| Key Words | ||
| electromagnetic waves; non-destructive evaluation; structural health monitoring; time domain reflectometry; transmission line | ||
| Address | ||
| (1) Dongsoo Lee, Dong-Ju Kim, Jinwook Kim, Jong-Sub Lee: School of Civil, Environmental and Architectural Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea; (2) Sang Yeob Kim: Department of Fire and Disaster Prevention, Konkuk University, 268, Chungwon-daero, Chungju-si, Chungcheongbuk-do, 27478, Republic of Korea. | ||