Health Index Evaluation on Acoustic Emission Signal for Concrete Structure by Intensity Analysis Method

Shahidan, Shahiron; Bunnori, Norazura Muhamad; Noorsuhada, Noor; Basri, Siti Ramziah

doi:10.4028/www.scientific.net/amr.403-408.3729

Cited by 11 publications

(7 citation statements)

References 11 publications

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“…The quantitative method of statistical analysis can be used for intensity analysis of AE signals, and the concrete damage can be evaluated by calculating the historical index ( HI ) and log severity (log 10 ( S r )). 29 The equations for HI and severity calculation are shown as follows…”

Section: Results and Analysismentioning

confidence: 99%

Experimental study on loading rate and notch-to-depth ratio effects on flexural performance of self-compacting concrete with acoustic emission and digital image correlation technologies

Chen

Shi

Zhang

et al. 2020

The Journal of Strain Analysis for Engineering Design

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As no extra vibration is needed in the casting procedure of self-compacting concrete for its excellent workability under its own dead weight, the material can be applied to construction projects where vibrations are hard to perform. To better utilize self-compacting concrete in practical engineering, it is essential to conduct an in-depth study on its fracture performance. In this study, three-point bending tests on notched self-compacting concrete beams were performed considering different loading rates and notch-to-depth ratios as variables. Acoustic emission technique and digital image correlation method were utilized to collect acoustic emission signals generated in the loading procedure and monitor crack propagation in the fracture process zone, respectively. Results show that the b-value from acoustic emission analysis can be divided into three stages and the variation range increases as the notch-to-depth ratio increases. Based on clustering analysis, three cluster groups can be obtained, and it is found that the ratio of the first cluster group decreases while that of the third cluster group increases when notch-to-depth ratio increases. With the aid of digital image correlation technique, effective crack length and horizontal crack opening displacement can be recorded and it is observed that crack tip opening displacement decreases as the notch-to-depth ratio increases.

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Section: Results and Analysismentioning

confidence: 99%

Experimental study on loading rate and notch-to-depth ratio effects on flexural performance of self-compacting concrete with acoustic emission and digital image correlation technologies

Chen

Shi

Zhang

et al. 2020

The Journal of Strain Analysis for Engineering Design

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show abstract

“…The other parameter is the severity index, which can be calculated by the following equation 48–51 :

S_{r} goodbreak= \frac{1}{J} ((), \sum_{i = 1}^{J} S_{om}),

where S r is the severity index, S om is the signal intensity of the m th hit, J is the empirical constant, and the J value of rock and concrete materials is defined in Table 5.…”

Section: Methodsmentioning

confidence: 99%

“…The other parameter is the severity index, which can be calculated by the following equation [48][49][50][51] :…”

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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“…Creep is defined as an increase of deformation under a constant load and it is very significant in fiber-based materials such as wood [18]. Understanding creep behavior is necessary to anticipate long-term deformation that would limit the performance and service life of our structures [19][20][21][22][23][24]. Fig.…”

Section: Lvl Floor Systemmentioning

confidence: 99%

Laminated Veneer Lumber (LVL) Sengon: An Innovative Sustainable Building Material in Indonesia

Awaludin¹,

Shahidan²,

Basuki³

et al. 2018

IJIE

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Health Index Evaluation on Acoustic Emission Signal for Concrete Structure by Intensity Analysis Method

Cited by 11 publications

References 11 publications

Experimental study on loading rate and notch-to-depth ratio effects on flexural performance of self-compacting concrete with acoustic emission and digital image correlation technologies

Experimental study on loading rate and notch-to-depth ratio effects on flexural performance of self-compacting concrete with acoustic emission and digital image correlation technologies

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

Laminated Veneer Lumber (LVL) Sengon: An Innovative Sustainable Building Material in Indonesia

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