A Novel Embeddable Tubular Piezoceramics-Based Smart Aggregate for Damage Detection in Two-Dimensional Concrete Structures

Gao, Weihang; Li, Hong‐Nan; Ho, Siu Chun Michael

doi:10.3390/s19071501

Cited by 29 publications

(22 citation statements)

References 61 publications

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“…The laboratory experiment showed a 92% accuracy predicted for damage classes. Gao et al [25] demonstrated a new a novel embeddable tubular smart aggregate (TSA) evolved from piezo materials and conducted an experiment recording the time of arrival and performing impedance analysis and sweep frequency analysis, and results were satisfactory for 2D concrete structures.…”

Section: Strategies Of Damage Detection In Buildings Using Shmmentioning

confidence: 99%

Practical Implementation of Structural Health Monitoring in Multi-Story Buildings

et al. 2021

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This study investigated operational and structural health monitoring (SHM) as well as damage evaluations for building structures. The study involved damage detection and the assessment of buildings by placing sensors and by assuming weak areas, and considered situations of assessment and self-monitoring. From this perspective, advanced sensor technology and data acquisition techniques can systematically monitor a building in real time. Furthermore, the structure’s response and behavior were observed and recorded to predict the damage to the building. In this paper, we discuss the real-time monitoring and response of buildings, which includes both static and dynamic analyses along with numerical simulation studies such as finite element analysis (FEA), and recommendations for the future research and development of SHM are made.

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Section: Strategies Of Damage Detection In Buildings Using Shmmentioning

confidence: 99%

Practical Implementation of Structural Health Monitoring in Multi-Story Buildings

et al. 2021

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“…Piezoelectric intelligent modules are the basic monitoring components in this method. Since the piezoelectric patches are composed of a thin brittle material, they are encapsulated in cement as intelligent modules to enhance the durability and the compatibility with concrete [ 37 ]. In this paper, the intelligent module is made of an epoxy cement protection of 30 mm (diameter) × 30 mm (height), with a circular lead zirconate titanate (PZT) patch of a diameter of 20 mm (diameter) × 1 mm (thickness) inside (see Figure 1 c).…”

Section: Piezoelectric Intelligent Module and Detecting Approach Fmentioning

confidence: 99%

Time Reverse Modeling of Damage Detection in Underwater Concrete Beams Using Piezoelectric Intelligent Modules

Liang

Chen

Shao

et al. 2020

Sensors

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Underwater cracks in concrete structures are often difficult to detect due to their complexity of the service environment. With numerical and experimental analysis of concrete beams immersed in water, an active monitoring system, based on a cement-based piezoelectric intelligent module array (CPIMA), was developed to locate and quantify the underwater cracks. Time reversal (TR) of the stress wave field is accomplished to focus on the crack area through the concrete beam specimen by the system. First, a piezoelectric actuator is applied to emit the initial propagating wave, which can be reflected, attenuated, and diffracted by the crack, transmitted through water filled in the crack, as well as diffracted by the coarse aggregates. To extract the damage waveforms associated with the crack and analyze the robust time-reversal invariance under the high-order multiple scattering effect, a pair of homogeneous and heterogeneous forward finite element (FE) models is established. Then, the damage waveforms are time-reversed and re-propagated in the inverse numerical model, where an optimal refocusing is achieved on the crack that behaves as an acoustic source. Finally, the damage area is obtained in the form of the stacked energy distribution of each time step. The focus results are represented by cloud images and compared with root-mean-square deviation (RMSD) values. Numerical simulation and experiments show that this method can identify and quantify underwater cracks effectively.

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“…To prevent structure destruction under impact load and increase the service time of SAs, a marble shell was used to replace the concrete one [52,53] in the next generation of SAs, and a copper shield was also added to increase the signal to noise ratio. A new tubular SA was proposed by Gao et al [54][55][56], and a piezoelectric tubular cylinder was used in this SA to excite omni-directional stress waves in a two-dimensional space. Nearly at the same time, a spherical SA, where the traditional piezoelectric patch was replaced by a piezoelectric spherical shell, was proposed by Kong et al [13,57] to excite ultrasonic waves in all the directions in a three-dimensional structure.…”

Section: Introductionmentioning

confidence: 99%

Actuating Performance Analysis of a New Smart Aggregate Using Piezoceramic Stack

Wang

Song

et al. 2021

Applied Sciences

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A new type of smart aggregate using piezoceramic stack (SAPS) was developed for improved output, as compared with a conventional smart aggregate with a single piezoceramic patch. Due to the better output, the proposed smart aggregate is preferred where the attenuating effect is strong. In this research, lead zirconate titanate (PZT) material in the form of discs was used due to its strong piezoelectric performance. For analysis, the proposed SAPS was simplified to a one-dimensional axial model to investigate its electromechanical and displacement output characteristics, and an experimental setup was designed to verify the simplified model. Moreover, the influence of the structural parameters, including the number of the PZT discs, the dimensions of the PZT disc, protective shell, and copper lids, and the elastic modulus of the epoxy on the electromechanical and displacement output performance of SAPSs, were numerically studied by using the one-dimensional axial model. The numerical analysis results indicate that the structural dimension of the PZT discs has a greater effect on the electromechanical performance of SAPSs than that of the protective shell and copper lids. Moreover, the results show that the number of the PZT discs and the outer diameter of the protective shell have a much greater influence on the displacement output of SAPSs than other parameters. The analysis results of SAPSs with different elastic moduli of the epoxy demonstrate that the SAPSs’ first resonance frequency, first electromechanical coupling factor, and displacement output change less than 1.79% when the epoxy’s elastic modulus changes from 1.28 GPa to 5.12 GPa, which indicates that the elastic modulus of the epoxy has a limited influence on the property of SAPSs, and it will be helpful for their fabrication. This study provides an approach to increasing the output of SAPS and also develops a method to design the structure of SAPSs.

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A Novel Embeddable Tubular Piezoceramics-Based Smart Aggregate for Damage Detection in Two-Dimensional Concrete Structures

Cited by 29 publications

References 61 publications

Practical Implementation of Structural Health Monitoring in Multi-Story Buildings

Practical Implementation of Structural Health Monitoring in Multi-Story Buildings

Time Reverse Modeling of Damage Detection in Underwater Concrete Beams Using Piezoelectric Intelligent Modules

Actuating Performance Analysis of a New Smart Aggregate Using Piezoceramic Stack

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