Abstract
An active sensing approach using piezoceramic induced stress wave is proposed to provide monitoring and early warning for the development of interface debonding damage of precast segmental concrete beams (PSCBs). Three concrete specimens with toothed interfaces were fabricated and bonded with high-strength epoxy resin adhesive to form PSCBs. Smart aggregates (SAs) embedded in concrete specimens are used as actuators and sensors. The PSCBs are subjected to periodic loading with hydraulic jack to test the different degrees of debonding damage. The experimental results of time-domain and frequency-domain analysis clearly show that the amplitude of the signal received by the piezoceramic sensor is reduced when debonding crack occurs. The energy analysis and damage index based on wavelet packet can be used to determine the existence and severity of interface debonding damage in PSCBs. The experimental research validates the feasibility of monitoring the interface debonding damage in PSCBs using SA transducers based on active sensing technique.
Highlights
Precast segmental concrete beams (PSCBs) are widely applied to civil engineering [1,2,3,4]
3.1. e PZT-Enabled Active Sensor Approach. e PZTenabled active sensing approach requires at least a pair of piezoelectric actuator and sensor placed on the surface or inside of a concrete structure [29]. e actuators are mainly driven by alternating current (AC) signals
SA1-1 and SA1-2 are used as actuators, respectively, and the received signals of sensor SA2 are shown in Figures 8 and 9
Summary
Precast segmental concrete beams (PSCBs) are widely applied to civil engineering [1,2,3,4]. Piezoceramic materials have many advantages, such as availability in different dimensions and shapes, fast response, wide frequency bandwidth, low cost, and capacities as both actuator and sensor for stress wave generation and detection [19]. Yan et al used PZT as transducers to experiment on the interface debonding slip and separation of steelconcrete composite beams, aiming to propose an interface damage identification model based on PZT wave technology and innovative damage detection methods [16]. Many methods have been successfully proposed for condition monitoring of different structures, there has been no report on the interface condition monitoring of PSCBs. In this paper, three-array piezoceramic smart aggregates (SAs) are embedded in concrete to enable the active sensing approach, which is used to identify the interface damage of segmented bonded concrete specimens during the loading period. Experimental results demonstrate that piezoceramic SAs can timely monitor the development process of cracks in segmented concrete specimens, which lays a foundation for the identification of related interface states in the future
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