Detection and quantification of diameter reduction due to corrosion in reinforcing steel bars

Amjad, Umar; Yadav, Susheel Kumar; Kundu, Tribikram

doi:10.1177/1475921715578315

Cited by 42 publications

(19 citation statements)

References 23 publications

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“…A number of experimental studies in the literature use guided waves to detect damage in RC beams, e.g. (Amjad et al, 2015). However, numerical characterization of free wave propagation in RC beams is limited.…”

Section: Introductionmentioning

confidence: 99%

Wave propagation and scattering in reinforced concrete beams

Masri

Ferguson

Waters

2019

The Journal of the Acoustical Society of America

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Steel reinforcement bars (rebars) are vital to the strength of reinforced concrete (RC) structures, but can become damaged due to corrosion. Such damage is generally invisible and non-destructive testing methods are needed to assess their integrity. Guided wave methods are popular because they are capable of detecting damage using sensors placed remotely from the damage site, which is often unknown. This paper predicts free wave propagation in RC beams from which the concept of a guided wave based damage detection method emerges. The wave solutions are obtained using the wave finite element framework where a short section of a beam's cross section is modeled in conventional finite element (FE) and periodic boundary conditions are subsequently applied. Reinforcement elements are used in the FE model of the cross section as a neat and efficient means of coupling the concrete to the rebars and imposing prestress. The results show that prestress, important for static behavior, has a negligible effect on wave dispersion. A RC beam with a damaged section is modeled by coupling three waveguides, the center waveguide being identical to the outer ones except for a thickness loss in one rebar. Only small differences in cut-on frequencies are observed between the damaged and undamaged sections. However, these small differences give rise to strong reflection of some waves at frequencies close to cut-on. Below cut-on, most incident power is transmitted but experiences wave mode conversion, whereas above cut-on most power is transmitted to the same wave type. These observations form the basis for ongoing work to develop a damage detection technique premised on wave reflection near cut-on.

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Section: Introductionmentioning

confidence: 99%

Wave propagation and scattering in reinforced concrete beams

Masri

Ferguson

Waters

2019

The Journal of the Acoustical Society of America

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“…At the receiving end, the ultrasonic pulse is detected and then converted back to an electric signal by a second transducer (detection). The PZT transducers that were used for this experiment [5][6] have a diameter of 3.50 cm and a thickness of 0.02 cm. The transducers are attached in direct contact with the composite samples when exciting and receiving the signal.…”

Section: Instrumentation and Methodsmentioning

confidence: 99%

“…It is often difficult to extract features for monitoring impact damages in composite plates using only traditional linear techniques therefore, this study will present both linear [1] and non-linear methods [2] of analysis. Guided acoustic waves are widely used for NDE to extract features for detecting and monitoring damages [1][2][3][4][5][6][7][8][9][10] . Multiple sets of composite plates are fabricated and examined by generating guided ultrasonic waves using Lead Zirconate Titanate (PZT) transducers.…”

Section: Introductionmentioning

confidence: 99%

Linear and non-linear analysis of composite plates using guided acoustic waves

Alnuaimi

Amjad

Russo

et al. 2019

Health Monitoring of Structural and Biological Systems XIII

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Guided acoustic wave techniques have been found to be very effective for damage detection. In this investigation Lead Zirconate Titanate (PZT) transducers are used to generate guided acoustic waves for structural health monitoring of a variety of composite specimens. Multiple sets of composite plate specimens are inspected for impact induced damage detection using PZT transducers. Composite samples are divided into two groups for comparative studies i.e. glass fiber composites and basalt fiber composites. They are damaged by impactors having different levels of impact energy. A chirp signal is excited and propagated through the specimens in a single sided excitation/detection setup to investigate the damages induced by impacts of varying intensity. Signal processing of the recorded signals for damage analysis involved both linear and nonlinear analyses. Linear ultrasonic analysis such as change in the time-of-flight of the propagating waves, Fast Fourier Transform and S-Transform of the recorded signals were tried out while the nonlinear ultrasonic analysis involved the Sideband Peak Count or the SPC technique.

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“…The practical engineering projects and recent progresses are reported like previous studies. 1–14 Far too many research branches exist on SHM to list. To sum it up, in the projects of SHM in civil infrastructures, the sensors (temperature, strain, stress, velocity, acceleration) are installed in the infrastructure to collect and transmit the monitoring data in real time.…”

Section: Introductionmentioning

confidence: 99%

Acceleration sensor placement technique for vibration test in structural health monitoring using microhabitat frog-leaping algorithm

Feng

Jia

2017

Structural Health Monitoring

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In this article, a microhabitat frog-leaping algorithm is proposed based on original shuffled frog-leaping algorithm and effective independence method to make the algorithm more efficient to optimize the 3-axis acceleration sensor configuration in the vibration test of structural health monitoring. Optimal sensor placement is a vital component of vibration test in structural health monitoring technique. Acceleration sensors should be placed such that all of the important information is collected. The resulting sensor configuration should be optimal such that the testing resources are saved. In addition, sensor configuration should be calculated automatically to facilitate engineers. However, most of the previous methods focus on the sensor placement of 1-axis sensors. Then, the 3-axis acceleration sensors are calculated by the method of 1-axis sensors, which results in non-optimal placement of many 3-axis acceleration sensors. Moreover, the calculation precisions and efficiencies of most of the previous methods cannot meet the requirement of practical engineering. In this work, the microhabitat frog-leaping algorithm is proposed to solve the optimal sensor placement problems of 3-axis acceleration sensors. The computation precision and efficiency are improved by microhabitat frog-leaping algorithm. Finally, microhabitat frog-leaping algorithm is applied and compared with other algorithms using Dalian South Bay Cross-sea Bridge.

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Detection and quantification of diameter reduction due to corrosion in reinforcing steel bars

Cited by 42 publications

References 23 publications

Wave propagation and scattering in reinforced concrete beams

Wave propagation and scattering in reinforced concrete beams

Linear and non-linear analysis of composite plates using guided acoustic waves

Acceleration sensor placement technique for vibration test in structural health monitoring using microhabitat frog-leaping algorithm

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