AE monitoring of reinforced concrete squat wall subjected to cyclic loading with information entropy-based analysis

Zhou

et al. 2019

Applied Sciences

The workability and mechanical properties of basalt fiber reactive powder concrete (BFRPC) were investigated by univariate analysis. The acoustic emission (AE) was used as a non-destructive technique to reveal the damage characterization of concrete samples of varying basalt fiber content. The fracture stages and modes of specimens during flexural test were determined by AE parameters. The content of silica fume, quartz sand and basalt fiber of 0.4, 1.3 and 10 kg/m3, respectively, was found related to optimal improvements in mechanical strength. As for the characteristics of fracture, it was found that the fiber content was a significant determinant, and the key AE parameters, namely, hits, energy and amplitude, were found related to the damage stage of specimens. Furthermore, rise time (RA) and average frequency (AF) were found to have opposite trends during loading while their variation related to the fracture modes of BFRPC.

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Crack Classification of Basalt Fiber RPC Based on Acoustic Emission Parameters

Zhou

et al. 2019

Applied Sciences

“…In the deformation process of RC structures under loading, plastic deformation energy was considered as a proper index for depicting damage properties. Existing studies validated that there was a good relationship between fracture energy and accumulated AE energy [31]. Therefore, the ID value was used to characterize the damage level of specimens, which was calculated by Equation 2.…”

Section: Resultsmentioning

confidence: 99%

“…And the constants α 1 and α 2 were adopted as 0 and 1, respectively. The value of Ib presents the ratio of AE signals with higher amplitudes to that with lower amplitude [31]. If Ib value presents an increasing trend, micro‐cracks nucleate and form.…”

Section: Resultsmentioning

confidence: 99%

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Fracture characterization of composite slabs with different connections based on acoustic emission parameters

Zhou

Shan

Struct Control Health Monit

et al. 2021

Self Cite

Summary Damage fracture characteristics of composite slabs with different connection configurations were analyzed using acoustic emission (AE) with cast‐in‐place (CIP) reinforced concrete (RC) slabs as contrast. AE characteristic parameters were obtained during static experiments and compared with each other. The bearing capacity was directly proportional to cumulative AE energy, rise time, and duration time, of which the correlation coefficient of rise time was the highest and reached 99.99%. The whole fracture process could be divided into three stages. Compared to CIP slabs, the rates of energy release in the former two stages were slower, which caused the worse ductility. Meanwhile, many other differences among the tested slabs were captured in aspects of energy release, crack development, and severity. Finally, the quantitative analysis of damage classifications was performed under various load levels. The experimental results were beneficial to advance the application of AE in fields of damage analysis and health monitoring for composite slabs.

“…Equation (1) is suitable to assess the damage degree of RC members, since a good relationship between AE energy and plastic strain energy has been validated by other researchers. 12,19 The b-value analysis. The b-value method (equation 2) was proposed originally by Gutenberg and Richter 20 to analyze the magnitude-frequency relationship for earthquakes…”

Section: Ae Analysis Methodsmentioning

confidence: 99%

Characterization of damage on precast pre-stressed concrete composite slabs under static loading based on acoustic emission parameters

Shan

Structural Health Monitoring

Jiang

et al. 2020

Self Cite

Precast pre-stressed concrete composite slabs have been widely used in recent years owing to excellent mechanical properties and cost savings. The low accuracy of visual observation and the complexity of actual measurement make the determination of the precise information of structural safety difficult. This article presents an acoustic emission study on the precast pre-stressed concrete composite slab under static loading. First, the correlation between acoustic emission hits (or energy) and crack width (or deflection) was obtained and compared in detail. Second, the stiffness of this composite slab was predicted using the acoustic emission amplitude. Third, a novel analysis method for damage fracture classification is proposed, which is based on the traditional parameter and fuzzy C-means clustering. This method can be used to determine visual crack emerging, rebar yielding, and eventual failure mode by an acoustic emission parametric analysis without involving visual inspection or mechanical measurement. It can be effectively used for fracture characterization and health monitoring of composite slabs.