Abstract
A novel approach to active structural health monitoring and damage detection of massive reinforced concrete structures using piezoelectric smart aggregates is presented in this paper. An innovative three-dimensional damage index, based on wavelet signal decomposition and energy of wave propagation, is derived in matrix form. Although the proposed three-dimensional damage index can be used for all types of reinforced concrete structures, it is primarily recommended for massive infrastructure buildings. The approach proposed in this paper is theoretically considered for an arbitrary shape of a reinforced concrete element, and it is numerically verified for various scenarios by varying the geometry of reinforced concrete elements, as well as the position, size and quantity of damage. Quasi-static analysis of piezoelectric smart aggregates is modelled using a standard finite element method, and the explicit finite element method is successfully applied in this research for modelling propagation of ultrasonic waves. The results based on numerically generated simulations indicate that the new approach to non-destructive damage detection using three-dimensional damage indexes is quite promising. However, an experimental verification of the proposed damage index will certainly be required in future research.
Highlights
Reinforced concrete (RC) structures are mainly used for the construction of civil engineering buildings of national importance, such as long span bridges, dams, and skyscrapers
The aim of this paper is to present 3D damage index (DI) that will be capable of detecting damage and partly determining the position of damage inside individual elements of RC structures
A novel three-dimensional damage index was developed in matrix form according to the wavelet signal decomposition and energy of wave propagation
Summary
Reinforced concrete (RC) structures are mainly used for the construction of civil engineering buildings of national importance, such as long span bridges, dams, and skyscrapers. The PZT SA embedded in a framed RC structure were applied as active devices for detecting damage and monitoring further damage propagation caused by experimental simulation of earthquake load [5,6]. The first concept, which presents the use of “Pitch-Catch” configuration of the actuators and sensors, will be applied in this paper It means that one PZT SA is used as the actuator for inducing mechanical wave propagation through RC structure, while the other PZT SA is used as the sensor for detecting the incoming wave. Two-dimensional damage index, based on the wavelet signal decomposition and energy of output signal, has been used for monitoring damage propagation in RC shear walls [22]. Current three-dimensional damage indices are related to the global analysis of structures, and are used for damage detection of frame structures. That is why it is necessary to work on further development of 3D damage indices and methods for damage localization in space
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