Pzt control of edge debonding in dynamically loaded concrete structures strengthened with composite materials

Abstract eng:
The present work considers the possibility of active repair of the edge debonding in dynamically loaded smart concrete structures strengthened with composite materials by using local piezoelectric (PZT) actuators/sensors and electro-mechanical admittance concept. The proposed methodology leads to compute the required electric voltages, which give “secondary forces” that are similar of magnitude but with opposite effect to that caused to the damaged area of the adhesive-concrete interface of the strengthened concrete structural components by the mechanical dynamic load. The electro-mechanical admittance generated at the electrical terminals of a PZT-driven smart structure is then extracted to synthesize a desired healthy structure’s admittance signature. In particular, the idea of this approach can be considered from the point of view of an inverse problem. The solution of this inverse problem is achieved in an optimization environment minimizing the RMS residual errors between the computed damaged interface and the desired healthy structure’s admittance signature in a pre-selected frequency range. To describe the dynamic response of the host structure and PZT patches, commercial software packages are used to build and simulate the mathematical model. The main contribution of this work is in providing a systematic approach to optimize the PZT control of edge debonding problems in full-scale civil engineering structures.

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