Frequency Analysis of Acoustic Emission Signal to Monitor Damage Evolution in Masonry Structures

Masera, Davide; Bocca, Pietro Giovanni; Grazzini, Alessandro

doi:10.1088/1742-6596/305/1/012134

Cited by 19 publications

(24 citation statements)

References 10 publications

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“…The tensile stress generates a diagonal crack ( Figure 8b). It can be noted that during laboratory tests, this diagonal crack is accompanied by a separation between the two mortar layers and the brickwork surfaces [11]. The ultimate shear stress and the shear strains in the static tests after pre-damaging cycles are considered.…”

Section: Results On Reinforced Brickwork Wallsmentioning

confidence: 99%

“…The AE technique was also applied in order to evaluate the damage evolution. Every reinforced specimen was equipped by six AE sensors to detect the AE signal during the tests and by a couple of displacement transducers for each side (positioned along the two diagonals) in order to measure the horizontal and vertical displacements [11,12]. The ATEL measurement system used by the authors consists of piezoelectric transducers associated with control units, calibrated on inclusive frequencies between 50 and 500 kHz.…”

Section: Reinforced Brickwork Wallsmentioning

confidence: 99%

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Durability evaluation of reinforced masonry by fatigue tests and acoustic emission technique

Carpinteri

Grazzini

Lacidogna

et al. 2013

Struct. Control Health Monit.

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SUMMARY An experimental analysis has been carried out on the long‐term behaviour of composite specimens and walls made with historical brickwork. The test pieces were subjected both to static and to cyclic loading tests (accelerate static creep) and to freezing‐thawing thermo‐hygrometric tests in order to study the durability of different strengthening mortars. The acoustic emission (AE) monitoring technique was also used to assess the damage localization and to predict the time to failure of the strengthened walls during fatigue tests. The AE is a very effective non‐destructive technique that permits to estimate the amount of energy released during fracture propagation. Damage evolution during fatigue compressive loading, in terms of measured strains and the AE counting number, can be divided into three stages; fatigue life can be predicted from the slope of the AE counting number rate diagram. Starting from an AE monitoring, a special methodology has been developed to predict the service life of creep damaged masonry structures. The novelty of this work consists in the experimental confirmation that the AE technique is able to analyse the creep curves of masonry strengthening mortars. Therefore, it demonstrated that by the AE technique, it is also possible to evaluate the durability of strengthening materials subjected to load histories in the time. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Results On Reinforced Brickwork Wallsmentioning

confidence: 99%

Section: Reinforced Brickwork Wallsmentioning

confidence: 99%

Durability evaluation of reinforced masonry by fatigue tests and acoustic emission technique

Carpinteri

Grazzini

Lacidogna

et al. 2013

Struct. Control Health Monit.

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“…In addition, the AE signals captured from sand particle crushing are comparable with those obtained from rock fracture processes. Previous studies on rock materials with AE instrumentation also showed that the AE signals associated with fracture mechanism are featured by high frequency (Read et al ; Masera, Bocca, and Grazzini ). By contrast, the AE signal generated by frictional sliding is dominated by relatively low‐frequency components.…”

Section: Test Results and Discussionmentioning

confidence: 94%

Behaviour and frequency characteristics of acoustic emissions from sandy ground under model pile penetration

Mao

Aoyama²,

Goto

et al. 2016

Near Surface Geophysics

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Acoustic emission (AE) testing is regarded as an effective non-destructive technique and is capable of detecting micro-level defects inside a material. In the field of civil engineering, the acoustic emission technique has been widely applied to the studies of steelwork, concrete, and composite materials. However, the geophysical investigations of the application of acoustic emission, dealing with porous granular media, are comparatively limited. In this study, the acoustic emission testing is implemented in a model pile system to investigate subsoil behaviour subjected to pile penetration. The results reveal that the tendency of acoustic emission settlement and load settlement shows high similarity. In addition, the detected acoustic emission signals are studied in the frequency domain using fast Fourier transformation. Higher frequency acoustic emission signals (>100 kHz) are interpreted to be associated with sand particle crushing, which provides a new insight to evaluate the feature of sand grain crushing. Furthermore, the distinction of acoustic emission characteristics observed among different pile penetration sequences demonstrates the effect of ground density on the subsoil behaviour. The results obtained in this paper are beneficial to further clarify the bearing mechanism of pile foundations and also to provide useful information on the fundamental characteristics of acoustic emission signals originating from stressed granular soils, that can be extended to other acoustic emission-based field investigations. tine methodology for process monitoring since only the end condi-

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“…AE monitoring during FRP debonding from concrete beams and slabs was studied by Carpinteri et al [25] who detected the propagation of flexural cracks in an FRP-strengthened beam, and by Degala et al [26] who observed the progressive debonding of CFRP strips from concrete slabs and differentiated between CFRP debonding and concrete failure (flexural, compressive or shear failure) by looking at the relative intensity of the AE signals. Shear behavior of strengthened masonry walls was analyzed with the acoustic emission technique by Masera et al [27] who observed decrease of the signal peak frequency upon failure of the masonry specimens. In the presented study, the debonding mechanism itself will be the object of investigation by means of the acoustic emission technique.…”

Section: Frp Debonding Detection With Aementioning

confidence: 99%

Debonding damage analysis in composite-masonry strengthening systems with polymer- and mortar-based matrix by means of the acoustic emission technique

Verstrynge

Wevers

Ghiassi

et al. 2015

Smart Mater. Struct.

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This is the postprint of a paper published as: Verstrynge, E., Wevers, M., Ghiassi, B., Lourenço, P. (2016 ABSTRACT: Different types of strengthening systems, based on fiber reinforced materials, are under investigation for external strengthening of historic masonry structures. A full characterization of the bond behavior and of the short-and long-term failure mechanisms is crucial to ensure effective design, compatibility with the historic substrate and durability of the strengthening solution. Therein, nondestructive techniques are essential for bond characterization, durability assessment and on-site condition monitoring. In this paper, the Acoustic Emission (AE) technique is evaluated for debonding characterization and localization on Fiber Reinforced Polymer (FRP)-and Steel Reinforced Grout (SRG)-strengthened clay bricks. Both types of strengthening systems are subjected to accelerated ageing tests under thermal cycles and to single-lap shear bond tests. During the reported experimental campaign, AE data from the accelerated ageing tests demonstrated the thermal incompatibility between brick and epoxy-bonded FRP composites and debonding damage was successfully detected, characterized and located. In addition, a qualitative comparison is made with digital image correlation and infrared thermography, in view of efficient on-site debonding detection.

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Frequency Analysis of Acoustic Emission Signal to Monitor Damage Evolution in Masonry Structures

Cited by 19 publications

References 10 publications

Durability evaluation of reinforced masonry by fatigue tests and acoustic emission technique

Durability evaluation of reinforced masonry by fatigue tests and acoustic emission technique

Behaviour and frequency characteristics of acoustic emissions from sandy ground under model pile penetration

Debonding damage analysis in composite-masonry strengthening systems with polymer- and mortar-based matrix by means of the acoustic emission technique

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