Reference-free determination of debonding length in reinforced concrete beams using guided wave propagation

Zima, Beata; Kędra, Rafał

doi:10.1016/j.conbuildmat.2019.02.143

Cited by 22 publications

(14 citation statements)

References 17 publications

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“…The results shown in the following paper are the continuation of the studies of debonding detection in RC structures [30,31]. The paper presents the results of theoretical and experimental investigations of guided wave propagation carried out on RC beams with artificially introduced debonding of varying sizes, shapes and locations.…”

Section: Introductionmentioning

confidence: 73%

“…The solution is presented as dispersion curves, which relate the wave group velocity and the excitation frequency. The results presented in the previous papers ( [30,31]) shown that, due to the gradual increase of debonding, the average wave velocity increases from cb (velocity in undamaged RC cross-section) to cf (wave velocity in free, steel bar). For this reason, when debonding damage is considered, two marginal cases need to be taken into account.…”

Section: Debonding Size Estimation Using Guided Waves-theoretical Bacmentioning

confidence: 92%

“…where L b1 and L b2 denote the lengths of the bonded, undamaged parts of the specimen (Figure 3). The detailed description of wave propagation phenomenon in a partially debonded bar and the experimental verification of the above relationships are presented in [30]. It was shown that the total length of both single and multiple debondings can be determined on the basis of ToF measurements.…”

Section: The Influence Of Damage Length On Wave Velocitymentioning

confidence: 99%

“…To analyze the influence of the total debonding area on wave velocity, in the first step the debonding length and circumferential extent impacts must be considered separately. The derivation of relationships between wave velocity and debonding dimensions (length and circumferential extent) presented in the following paragraph are based on previously conducted studies shown in [30,31]. Based on the theory, the novel relationship, applicable to detection of debonding of any size, shape and location is derived.…”

Section: Debonding Size Estimation Using Guided Waves-theoretical Bacmentioning

confidence: 99%

“…For example, in Figure 1 the theoretical velocity c b was determined for excitation frequency of 80 kHz. If the velocity c b is known, the ToF denoted as t a of the first reflection registered at the end B of the beam with total length L a can be then calculated as [30]:…”

Section: Debonding Size Estimation Using Guided Waves-theoretical Bacmentioning

confidence: 99%

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Debonding Size Estimation in Reinforced Concrete Beams Using Guided Wave-Based Method

Zima

Kędra

2020

Sensors

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The following paper presents the results of the theoretical and experimental analysis of the influence of debonding size on guided wave propagation in reinforced concrete beams. The main aim of the paper is a development of a novel, baseline-free method for determining the total area of debonding between steel rebar embedded in a concrete cover on the basis of the average wave velocity or the time of flight. The correctness of the developed relationships was verified during the experimental tests, which included propagation of guided waves in concrete beams with the varying debonding size, shape and location. The analysis of the collected results proved that guided waves can be efficiently used not only in the debonding detection, but also in an exact determining of its total area, which is extremely important in the context of the nondestructive assessment of the load capacity of the reinforced concrete structures. The undeniable advantage of the proposed method is that there are no requirements for any baseline signals collected for an undamaged structure. The paper comprises of the detailed step by step algorithm description and a discussion of both the advantages and disadvantages.

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Section: Introductionmentioning

confidence: 73%

Section: Debonding Size Estimation Using Guided Waves-theoretical Bacmentioning

confidence: 92%

Section: The Influence Of Damage Length On Wave Velocitymentioning

confidence: 99%

Section: Debonding Size Estimation Using Guided Waves-theoretical Bacmentioning

confidence: 99%

Section: Debonding Size Estimation Using Guided Waves-theoretical Bacmentioning

confidence: 99%

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Debonding Size Estimation in Reinforced Concrete Beams Using Guided Wave-Based Method

Zima

Kędra

2020

Sensors

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Analytical computation of the dominant dispersion trend of Lamb waves in plate‐like structures with an improved dynamic stiffness matrix method

Lin

Ashlock

Shams

et al. 2022

Structural Contr & Hlth

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Lamb waves have infinite number dispersion modes; however, no every mode is excitable and detectable. Traditional matrix methods can calculate the dispersion curve of each mode over the full range of possible frequencies. However, the resulting numerically calculated multimodal dispersion curves do not fully represent the dispersion curves measured in real experiments, which are most often dominated by energy from specific modes. An improved dynamic stiffness matrix method is proposed herein to overcome such challenges of the traditional matrix methods. The first step of the improved method is to calculate the displacement response of a plate-like structure under a vertical dynamic loading using the global stiffness matrix of the structure, then the dominant dispersion trend is extracted from the displacement using the phasevelocity scanning scheme. The improved method is verified with three case studies representing typical plate-like structures in structural engineering. The results demonstrate that dispersion trends calculated with the improved method have good agreement with those obtained from experimental measurements.

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Debonding Detection in Reinforced Concrete Beams with the Use of Guided Wave Propagation

Zima

2019

Lecture Notes in Mechanical Engineering

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Reference-free determination of debonding length in reinforced concrete beams using guided wave propagation

Cited by 22 publications

References 17 publications

Debonding Size Estimation in Reinforced Concrete Beams Using Guided Wave-Based Method

Debonding Size Estimation in Reinforced Concrete Beams Using Guided Wave-Based Method

Analytical computation of the dominant dispersion trend of Lamb waves in plate‐like structures with an improved dynamic stiffness matrix method

Debonding Detection in Reinforced Concrete Beams with the Use of Guided Wave Propagation

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