Concrete piezoceramic smart module pairs-based damage diagnosis of hydraulic structure

Abstract

As a main reaction on the ageing behavior of hydraulic concrete structure, the structural damage is harm to structural safety. With the dynamic damage experiment of concrete gravity dam model under ambient excitation, a concrete piezoceramic smart module (CPSM) pairs-based approach is studied to implement the dynamic characteristics identification and damage diagnosis of hydraulic structure. Based on the piezoelectric coupling property and elastic-plastic contact property of CPSM, which are analyzed by use of numerical simulation software, the optimal shape of CPSM is given. A self-made CPSM-based monitoring platform is developed to obtain the information on structural damage. A wavelet packet decomposition method of CPSM signal is introduced. By analyzing the relation between CPSM signal amplitude and wavelet packet node energy, an index, which is defined with wavelet packet node energy, is proposed to describe the structural damage. The dynamic experimental result shows that above defined index changes obviously with the structural developing damage, and can well reflect the structural damage status. The feasibility and effectiveness of self-made CPSM-based approach are verified to identify the dynamic characteristics and diagnose the hidden damage for hydraulic structure.