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An integrated approach for structural health monitoring of concrete structures based on electromechanical admittance and guided waves

Providakis Konstantinos, Stavroulaki Maria, Voutetaki Maria-Styliani, K. Stefanaki, J. Tsompanakis, J. Agadakos

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Περίληψη

An integrated monitoring approach for near and far-field damage detection inconcrete structures based on simultaneous use of electromechanical admittance and guidedwave propagation is presented in this work. The proposed sensing system uses arrays of PZTpatches bonded on the surfaces of concrete structures which are serving as multi-modesensors/actuators. This innovative technique takes advantage of two PZT basic capabilities:a) to serve as near-field damage detection sensors using the high-frequencyelectromechanical (E/M) admittance monitoring technique and b) to serve as far-fielddamage detection sensors using guided wave propagation monitoring technique. In theguided wave propagation, one PZT patch acts as actuator and launches an elastic wavethrough the structure, which then can be measured by another PZT patch which in the sametime serves as admittance sensor. The integration approach of both two methodologies is thenstraightforward because the same piezoelectric patch can be used for both methods. Thisintegration approach is experimentally validated in this work by inspecting the sensingcapabilities of custom-made “multi-mode” sensing system for damage detection of concretestructures.

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