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http://dx.doi.org/10.14346/JKOSOS.2013.28.5.21

Visualization of Delamination Region in Concrete Structures using Mode Shapes of Delaminated Concrete Section (I) : Modal Test  

Oh, Taekeun (Department of Safety Engineering, Incheon National University)
Shin, Sung Woo (Department of Safety Engineering, Pukyoung National University)
Publication Information
Journal of the Korean Society of Safety / v.28, no.5, 2013 , pp. 21-26 More about this Journal
Abstract
Delamination of cover concrete due to re-bar corrosion is a critical damage reducing structural safety of reinforced concrete structures. Therefore, it should be detected and evaluated to provide appropriate maintenance to recover structural integrity. Impact-echo method, which utilizes thickness vibration characteristics of delaminated concrete section, is effective for detection and evaluation of small areal size delamination. However, it may not be applicable for large areal size delamination in which flexural vibration modes are dominated. In this study, applicability of vibration mode shapes of delaminated concrete section is investigated for visualization of delamination region in concrete structures. Numerical and experimental modal tests are performed to estimate mode shapes of delaminated concrete section and linear absolute summation technique is proposed for effective visualization of delamination region based on estimated mode shapes.
Keywords
delamination of concrete; mode shape; damage visualization; safety inspection;
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