Classification of Damage Mode of Reinforced Concrete Beams Using Acoustic Emission Technique

Noorsuhada, Noor; Ibrahim, Azmi; Bunnori, Norazura Muhamad; Noor, Mat; Hamidah, M. S.; Shahidan, Shahiron

doi:10.4028/www.scientific.net/amr.626.953

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Te method has two parameters: the history index (HI) and the severity index (S r ). HI characterizes the slope of the cumulative signal intensity over time by comparing the signal intensity of all hits, which can be obtained by the following equation [33]:…”

Section: Intensity Signal Analysis Methodmentioning

confidence: 99%

Quantitative Visualization Monitoring of Cracks at Shotcrete-Rock Interface Based on Acoustic Emission

Guo,

Chen,

et al. 2023

Structural Control and Health Monitoring

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To investigate the possibility of quantitative monitoring of the fracture process zone (FPZ) at the shotcrete-rock interface, the acoustic emission (AE) and digital image correlation (DIC) are used to monitor the three-point bending test of shotcrete-rock specimens. Firstly, the AE intensity signal characteristics during damage to the shotcrete-rock interface are analyzed. Then, the spatial b-value of AE is used to visually characterize the shotcrete-rock interface damage, and the interface damage characteristics of two specimens, shotcrete-granite and shotcrete-sandstone, are analyzed using this analysis method. The analysis reveals that not only the AE spatial b-value can determine the location of microdamage within the interface but it can also characterize the degree of damage. Finally, a new parameter, Tb-value, is constructed based on the AE spatial b-value to quantitatively characterize the FPZ, and the newly established characterization method is validated with the FPZ monitored by DIC. The results show that the Tb-value not only locates and visually characterizes the location of the FPZ within the specimen but also enables the quantitative determination of the FPZ. This provides a new idea for localizing and quantitatively monitoring cracks and FPZs inside structures using AE techniques.

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Section: Intensity Signal Analysis Methodmentioning

confidence: 99%

Quantitative Visualization Monitoring of Cracks at Shotcrete-Rock Interface Based on Acoustic Emission

Guo,

Chen,

et al. 2023

Structural Control and Health Monitoring

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“…HI represents the slope of cumulative signal intensity with time by comparing the signal intensity of all hits, so HI is a very effective parameter to determine the trend of AE data. The historical index can be obtained from the following equation 43–47 :

italicHI ((), t) goodbreak= \frac{N}{N - K} ((), \frac{{false\sum}_{i = K + 1}^{N} S_{italicoi}}{{false\sum}_{i = 1}^{N} S_{italicoi}}),

where HI ( t ) is the historical index of t time; N is the number of hits up to t time; S oi is the signal intensity of the i th hit; K is an empirical constant. The definition of the K value of reinforced concrete material is shown in Table 4.…”

Section: Methodsmentioning

confidence: 99%

Section: Isa Methodsmentioning

confidence: 99%

Visual damage identification of concrete cylinders with steel‐fiber‐reinforced composite bars based on acoustic emission

Guo

Chen

Tang

et al. 2021

Structural Contr & Hlth

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Steel-fiber-reinforced composite bar (SFCB) is a composite bar composed of a crescent-rib steel bar and an outer protruded fiber-reinforced polymer (FRP) layer. Due to its unique post-yield stiffness and superior anti-corrosion behavior, the SFCB is except to be an ideal reinforcement for concrete structures subject to a high corrosion environment. For SFCB-reinforced concrete cylinders, their internal damage mechanism has never been experimentally studied but was usually speculated with the brittle failure due to the potential brittle fracture of the SFCB. To reveal the compression damage mechanism of SFCBreinforced concrete cylinders, a uniaxial compression test for SFCB-reinforced concrete cylinders was carried out at first. The entire damage process of SFCBreinforced concrete cylinders was monitored in real-time by acoustic emission (AE), a widely used nondestructive testing method. The test result shows that the SFCB-reinforced concrete cylinders fail after the buckling of longitudinal SFCB or the fracture of the stirrup. The intensity signal analysis of AE proves the failure mode of the SFCB-reinforced concrete cylinder was close to a plastic failure instead of a brittle failure. Furthermore, a new damage visualization method is proposed to analyze the internal damage of the concrete cylinders by using the spatial b value of AE. The T value was constructed by combining the spatial b value with the density distribution of AE events. It is proven that the T value is highly sensitive to the serious damages of the concrete cylinders and can be used to identify the damage locations inside the concrete cylinders.acoustic emission, concrete cylinder, damage identification, steel-fiber-reinforced composite bar, uniaxial compression | INTRODUCTIONSteel-fiber-reinforced composite bar (SFCB) is a type of composite bar developed almost a decade ago. 1 It is composed of a crescent-rib steel bar and an outer protruded fiber-reinforced polymer (FRP) layer, as shown in Figure 1. SFCB has a good bonding property with concrete 2,3 and is excepted to be an ideal reinforcement for concrete structures subject to the high earthquake risk area or the high corrosion environment due to its unique post-yield stiffness and superior anti-corrosion behavior. 1,4,5

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Structural health monitoring through acoustic emission

Nor

2018

Eco-Efficient Repair and Rehabilitation of Concrete Infrastructures

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Classification of Damage Mode of Reinforced Concrete Beams Using Acoustic Emission Technique

Cited by 3 publications

References 7 publications

Quantitative Visualization Monitoring of Cracks at Shotcrete-Rock Interface Based on Acoustic Emission

Quantitative Visualization Monitoring of Cracks at Shotcrete-Rock Interface Based on Acoustic Emission

Visual damage identification of concrete cylinders with steel‐fiber‐reinforced composite bars based on acoustic emission

Structural health monitoring through acoustic emission

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