Abstract
One of the most promising approaches for the diagnostic of reinforced concrete structures is vibration diagnostics which analyze natural vibrations and transient processes caused by impact loads. It concentrates on the evolution of the shock wave front passing through the structure. The results of measurements are analyzed based on mathematical simulation of the propagation of deformation wave in space and time. The presence of a defect in the structure causes changes in the shape, frequency composition and propagation time of the wave. The mathematical model is also used for determining the main parameters of experimental measurements: frequency range, actuator power and sensor sensitivity and their number and spatial location. A theoretical and experimental approach is proposed to determine elastic and dissipative characteristics of concrete. In the framework of viscoelastic model, the deformation response of a concrete specimen to an impact load is analyzed. The numerical solution is obtained by the finite-element method using the ANSYS software. Based on this solution, structural scheme of experiments has been obtained. In experiments free vibrations of the specimen were excited. The deformation response was recorded with a laser vibrometer. A special iterative procedure ensuring the agreement between numerical and experimental results was developed. The proposed approach provides a high sensitivity of the vibrodiagnostic procedure to the appearance and development of defects in concrete structures.
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