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Structural Engineering and Mechanics Volume 78, Number 5, June10 2021 , pages 599-610 DOI: https://doi.org/10.12989/sem.2021.78.5.599 |
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A vibration based acoustic wave propagation technique for assessment of crack and corrosion induced damage in concrete structures |
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Rahul Dev Kundu and Saptarshi Sasmal
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| Abstract | ||
| Early detection of small concrete crack or reinforcement corrosion is necessary for Structural Health Monitoring (SHM). Global vibration based methods are advantageous over local methods because of simple equipment installation and cost efficiency. Among vibration based techniques, FRF based methods are preferred over modal based methods. In this study, a new coupled method using frequency response function (FRF) and proper orthogonal modes (POM) is proposed by using the dynamic characteristic of a damaged beam. For the numerical simulation, wave finite element (WFE), coupled with traditional finite element (FE) method is used for effectively incorporating the damage related information and faster computation. As reported in literature, hybrid combination of wave function based wave finite element method and shape function based finite element method can addresses the mid frequency modelling difficulty as it utilises the advantages of both the methods. It also reduces the dynamic matrix dimension. The algorithms are implemented on a three-dimensional reinforced concrete beam. Damage is modelled and studied for two scenarios, i.e., crack in concrete and rebar corrosion. Single and multiple damage locations with different damage length are also considered. The proposed methodology is found to be very sensitive to both single- and multiple- damage while being computationally efficient at the same time. It is observed that the detection of damage due to corrosion is more challenging than that of concrete crack. The similarity index obtained from the damage parameters shows that it can be a very effective indicator for appropriately indicating initiation of damage in concrete structure in the form of spread corrosion or invisible crack. | ||
| Key Words | ||
| SHM; wave finite element; coupled numerical technique; corrosion detection; crack detection; FRF signature | ||
| Address | ||
| Rahul Dev Kundu: Department of Civil Engineering, Indian Institute of Technology, Kharagpur, India and Intern, CSIR-Structural Engineering Research Centre (CSIR-SERC), Chennai 600113, India Saptarshi Sasmal: Special and Multifunctional Structures Laboratory, CSIR-Structural Engineering Research Centre (CSIR-SERC), CSIR-Structural Engineering Research Centre (CSIR-SERC), Chennai, 600113, India | ||