A Low-Cost Prestress Monitoring Method for Post-Tensioned RC Beam Using Piezoelectric-Based Smart Strand

Le, Thanh-Cao; Phan, Thi Tuong Vy; Nguyen, Trung-Hau; Ho, Duc-Duy; Huynh, Thanh‐Canh

doi:10.3390/buildings11100431

Cited by 17 publications

(34 citation statements)

References 56 publications

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“…As shown in Figure 4a, the experiment was conducted on the RC girder having 6.4 m in length with simply supported boundary conditions. 27 The structure was post-tensioned by a piezoelectric-based smart strand. As depicted in Figure 4b, the EMI sensor was clamped on the seven-wire steel strand so that the distance between the left end and the anchor head was 40 mm.…”

Section: Methodsmentioning

confidence: 99%

“…Further, Equation ( 17) reveals that the analytical EMI response would contain multi-resonant peaks corresponding to the multi-modes of the EMI sensor; thus, it can overcome the previous drawback of the previous model of the smart strand. 27 It is also worthy to note that this study uses a fixed-fixed beam model to derive the EMI response and introduces the shear-lag factor (ξ) to simulate the realistic attachment capacity of the EMI sensor, those are completely different from the previous analytical models in the literature. [28][29][30] Besides, most previous EMI models have been not updated, so they are often imprecisely to predict the resonant peaks in an actual EMI response.…”

Section: Analytical Emi Model Of Piezoelectric-based Smart Strandmentioning

confidence: 99%

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Analytical impedance model for piezoelectric‐based smart Strand and its feasibility for prestress force prediction

Nguyen

Hoang

Huynh

2022

Structural Contr & Hlth

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The concept of the piezoelectric-based smart strand has been recently developed for low-cost prestress force monitoring of post-tensioned structures. However, the previous study uses the single-degree-of-freedom system that is inadequate to describe multiple resonances in a realistic electromechanical impedance (EMI) signature. Furthermore, the EMI-based prestress force prediction has mostly relied on statistical regression models that are difficult to apply to existing prestressed structures, where the collection of EMI data in failure cases is almost impossible. In this study, we newly propose a highfidelity analytical EMI model for the smart strand technique and develop a simple model-update-based method for prestress force prediction. The experimental result shows that the proposed analytical model is capable to generate the realistic EMI response of multiple modes at a similar frequency band with identical patterns. Also, the prestress force in the smart strand can be reliably predicted by minimizing the gap between the analytical EMI response and the experimental data through a genetic algorithm-based model-updating process.

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Section: Methodsmentioning

confidence: 99%

Section: Analytical Emi Model Of Piezoelectric-based Smart Strandmentioning

confidence: 99%

Analytical impedance model for piezoelectric‐based smart Strand and its feasibility for prestress force prediction

Nguyen

Hoang

Huynh

2022

Structural Contr & Hlth

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“…Long-term prestress loss refers to time-dependent decrease of the prestressing force because of creep and shrinkage of concrete and relaxation of strands. It is difficult to accurately monitor or measure prestress loss [16]. Instead, prediction using code equations is conducted in most cases.…”

Section: Instantaneous Prestress Lossmentioning

confidence: 99%

Prestressed Concrete Box Girder with High-Capacity Strands-Monitoring and Analysis during Fabrication

Xin

Ban

et al. 2022

Buildings

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Despite the attractive merits of high-capacity strands, the application in bridge girders is limited due to concerns, including concrete cracking, excessive stress, and cambers. An efficient and defect-free production is the first step to wide application. The objective of this research was to alleviate the production concerns of prestressed concrete bridge girders using high-capacity strands. A gigantic prestressed concrete box girder using 18-mm strands was produced; its entire fabrication process (from strand stressing to detension) was introduced. Sixteen temperature gauges were embedded in the girder to monitor the hydration of the large volume of concrete and the adjacent environmental temperature. Moreover, displacement transducers were used to measure the camber at detension; load cells were installed to monitor the variations of the prestressing strand tensile forces during fabrication. Monitoring and analysis showed that the timing of the detension is determined by the hydration of the concrete, the compressive strength of the concrete, and its modulus of elasticity or age. Since the tensile forces in strands are affected by the concrete’s internal temperature, the detension is conducted after the concrete temperature falls back (close to its initial value); otherwise, unfavorable and considerable prestress losses are caused. Finally, a 4-d detension was suggested since the hydration was not a concern at the time; the predicted prestress loss and camber were acceptable and the concrete material properties at 4 d satisfied the requirements.

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“…The general idea is to design compact piezoelectric devices that are equipped with PZT patches. For example, smart piezoelectric aggregates were proposed to monitor the structural condition of concrete members [15][16][17], piezoelectric-based smart strands for tension force monitoring [18,19], smart piezoelectric transducers to monitor corrosion occurrence [20], and smart piezoelectric washers to detect preload changes in a bolted joint [13,21].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Single-Point Mount PZT-Interface for Admittance-Based Anchor Force Monitoring

Nguyen

Phan

et al. 2021

Buildings

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This study investigates the dynamic characteristics of a smart PZT interface mounted on a prestressed anchorage to verify the numerical feasibility of the admittance-based anchor force monitoring technique. Firstly, the admittance-based anchor force monitoring technique through a single-mount PZT interface is outlined. The admittance response of the PZT interface-anchorage system is theoretically derived to show the proof-of-concept of the technique for anchor force monitoring. Secondly, a finite element model corresponding to a well-established experimental model in the literature is constructed. The effect of anchor force is equivalently treated by the contact stiffness and damping parameters at the bottom surface of the anchorage. Thirdly, the admittance and the impedance responses are numerically analyzed and compared with the experimental data to evaluate the accuracy of the numerical modelling technique. Fourthly, the local dynamics of the PZT interface are analyzed by modal analysis to determine vibration modes that are sensitive to the change in the contact stiffness (i.e., representing the anchor force). Finally, the admittance responses corresponding to the sensitive vibration modes are numerically analyzed under the change in the contact stiffness. The frequency shift and the admittance change are quantified by statistical damage indices to verify the numerical feasibility of the anchor force monitoring technique via the smart PZT interface. The study is expected to provide a reference numerical model for the design of the single-point mount PZT interface.

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A Low-Cost Prestress Monitoring Method for Post-Tensioned RC Beam Using Piezoelectric-Based Smart Strand

Cited by 17 publications

References 56 publications

Analytical impedance model for piezoelectric‐based smart Strand and its feasibility for prestress force prediction

Analytical impedance model for piezoelectric‐based smart Strand and its feasibility for prestress force prediction

Prestressed Concrete Box Girder with High-Capacity Strands-Monitoring and Analysis during Fabrication

Numerical Simulation of Single-Point Mount PZT-Interface for Admittance-Based Anchor Force Monitoring

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