Numerical Simulation of Monitoring Corrosion in Reinforced Concrete Based on Ultrasonic Guided Waves

Zheng, Zhuo; Lei, Ying; Xue, Xiongzhi

doi:10.1155/2014/752494

Cited by 11 publications

(9 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ultrasonic guided waves technique [4][5][6][7][8][9][10][11][12] has recently emerged as a highly efficient inspection approach for largescale structures. It shows significant potentials in NDE (nondestructive evaluation) and SHM (Structural Health Monitoring) for the inspection of structures in various fields, i.e., plates [13][14][15][16][17], pipelines [18][19][20][21][22][23][24][25], railways [26][27][28][29], and other structures [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Excitation and Propagation of Longitudinal L (0, 2) Mode Ultrasonic Guided Waves for the Detection of Damages in Hexagonal Pipes: Numerical and Experimental Studies

Wan

Zhang

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

The hexagonal pipe is a special kind of tube structure. Its inner surface of the cross section is in the shape of circle, while the outer surface is hexagonal. It has functioned as an essential and critical part of a drill stem in a high-torque drill machine used in various resource exploitation fields. The inspection of a hexagonal pipe to avoid its failure and thus to ensure safe operation of a drilling machine is becoming increasingly urgent and important. In this study, the excitation and propagation of ultrasonic guided waves for the purpose of detecting defects in hexagonal pipes are proposed. Dispersion curves of hexagonal pipes are firstly derived by using semianalytical ﬁnite element method. Based on these dispersion curves, longitudinal L (0, 2) mode at 100 kHz is selected to inspect hexagonal pipes. A ring of piezoelectric transducers (PZTs) with the size of 25 mm × 5 mm ×0.5 mm is able to maximize the amplitude of L (0, 2) mode and successfully suppress the undesired L (0, 1) mode in the experiments. Numerical and experimental studies have shown that the displacement field of L (0, 2) mode at 100 kHz is almost uniformly distributed along the circumferential direction. Furthermore, L (0, 2) mode ultrasonic guided waves at 100 kHz are capable of detecting circular through-hole damages located in the plane and near the edge in a hexagonal pipe. Our study results have demonstrated that the use of longitudinal L (0, 2) mode ultrasonic guided wave provides a promising and effective alternative for the detection of defects in hexagonal pipe structures.

show abstract

Section: Introductionmentioning

confidence: 99%

Excitation and Propagation of Longitudinal L (0, 2) Mode Ultrasonic Guided Waves for the Detection of Damages in Hexagonal Pipes: Numerical and Experimental Studies

Wan

Zhang

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…Simulations on a single rebar embedded in concrete showed a significant reflected pulse, carried by a high order longitudinal mode, when a 40-60% notch was introduced to the rebar. A similar numerical study, exploiting the fundamental longitudinal mode, employed wavelet analysis to help extract a weak reflection due to a notch from a multitude of other reflections [8]. An alternative approach is to identify changes in wave dispersion due to damage by monitoring the time-of-flight of a prevailing wave type; this is independent of transducer bonding.…”

Section: Introductionmentioning

confidence: 99%

Guided Wave Inspection of Bars in Reinforced-Concrete Beams Using Surface-Mounted Vibration Sensors

2020

View full text Add to dashboard Cite

Steel reinforcement bars (rebars) in concrete structures are inaccessible and not conducive to many inspection methods. This paper proposes a non-invasive technique based on guided waves for detecting localised abnormalities in rebars embedded in concrete beams. The technique is predicated on previously published observations that guided waves are strongly reflected by discontinuities at the frequency at which they begin to propagate, i.e., at cut-on. The reflection coefficient at cut-on is estimated using a simple wave decomposition in which a near-zero wavenumber value is assumed. A simulated study is first carried out to evaluate the technique on a concrete beam featuring four rebars. The wave finite element approach is adopted to model two uniform beams which are coupled via a short, damaged section modelled in conventional finite element analysis. Estimated reflection coefficients arising from the discontinuity are close to the true values at cut-on and independent of frequency elsewhere, so that no prior knowledge of cut-on frequencies is required. Three steel-reinforced concrete beams were fabricated—one uniform and two with localised rebar damage—and reflection coefficients were estimated from measured transfer functions. As predicted, abrupt deviations in the reflection coefficient occurred at cut-on frequencies for both damaged beams.

show abstract

“…Zhu et al [11] used ultrasonic guided waves for nondestructive evaluation/structural health monitoring of trusses. The finite element method (FEM) is often carried out to assist structural design [12] and also used to study the guided waves for SHM in the civil infrastructures. Yi et al [13] used FEM to predict the location of pitting corrosion in reinforced concrete based on guided waves.…”

Section: Introductionmentioning

confidence: 99%

Effects of Concrete on Propagation Characteristics of Guided Wave in Steel Bar Embedded in Concrete

Zheng

Lei

2014

Shock and Vibration

Self Cite

View full text Add to dashboard Cite

Techniques based on ultrasonic guided waves (UGWs) play important roles in the structural health monitoring (SHM) of large-scale civil infrastructures. In this paper, dispersion equations of longitudinal wave propagation in reinforced concrete member are investigated for the purpose of monitoring steels embedded in concrete. For a steel bar embedded in concrete, not the velocity but the attenuation dispersion curves will be affected by the concrete. The effects of steel-to-concrete shear modulus ratio, density ratio, and Poisson’s ratio on propagation characteristics of guided wave in steel bar embedded in concrete were studied by the analysis of the real and imaginary parts of the wave number. The attenuation characteristics of guided waves of steel bar in different conditions including different bar concrete constraint and different diameter of steel bar are also analyzed. Studies of the influence of concrete on propagation characteristics of guided wave in steel bars embedded in concrete will increase the accuracy in judging the structure integrity and promote the level of defect detection for the steel bars embedded in concrete.

show abstract

Numerical Simulation of Monitoring Corrosion in Reinforced Concrete Based on Ultrasonic Guided Waves

Cited by 11 publications

References 13 publications

Excitation and Propagation of Longitudinal L (0, 2) Mode Ultrasonic Guided Waves for the Detection of Damages in Hexagonal Pipes: Numerical and Experimental Studies

Excitation and Propagation of Longitudinal L (0, 2) Mode Ultrasonic Guided Waves for the Detection of Damages in Hexagonal Pipes: Numerical and Experimental Studies

Guided Wave Inspection of Bars in Reinforced-Concrete Beams Using Surface-Mounted Vibration Sensors

Effects of Concrete on Propagation Characteristics of Guided Wave in Steel Bar Embedded in Concrete

Contact Info

Product

Resources

About