Crack monitoring in historical masonry with distributed strain and acoustic emission sensing techniques

Verstrynge, Els; Wilder, Kristof De; Drougkas, Anastasios; Voet, Eli; Balen, Koen Van; Wevers, Martine

doi:10.1016/j.conbuildmat.2018.01.103

Cited by 68 publications

(38 citation statements)

References 23 publications

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“…Carpinteri et al [214] examined historic masonry structures and identified internal crack distribution with AE source location methods. More recent reviews of AE studies of masonry structures were given by De Santis et al [215] and Verstrynge et al [216], again demonstrating the values of AE technology.…”

Section: Discussionmentioning

confidence: 99%

Review on Structural Health Evaluation with Acoustic Emission

Ono

2018

Applied Sciences

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This review introduces several areas of importance in acoustic emission (AE) technology, starting from signal attenuation. Signal loss is a critical issue in any large-scale AE monitoring, but few systematic studies have appeared. Information on damping and attenuation has been gathered from metal, polymer, and composite fields to provide a useful method for AE monitoring. This is followed by discussion on source location, bridge monitoring, sensing and signal processing, and pressure vessels and tanks, then special applications are briefly covered. Here, useful information and valuable sources are identified with short comments indicating their significance. It is hoped that readers note developments in areas outside of their own specialty for possible cross-fertilization.

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Section: Discussionmentioning

confidence: 99%

Review on Structural Health Evaluation with Acoustic Emission

Ono

2018

Applied Sciences

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“…In order to improve the responsivity of FBGs at very low-pressure levels, Moccia et al used a ring-shaped polymer's coating and demonstrated a microphone with a minimum detectable acoustic signal of about 10 mPa Hz −1 [17]. The excellent multiplexing capability of the FBG based microphones has been effectively utilized for condition monitoring of marine lifting surfaces and also for crack monitoring in historical masonry [18,19]. However, the requirement of temperature compensation techniques and the sophisticated fabrication process increases the complexity of the sensor and its cost as well.…”

Section: Introductionmentioning

confidence: 99%

S-shaped microfiber based diaphragm supported optical microphone

2019

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We propose and demonstrate a simple and highly sensitive optical microphone based on S-shaped tapered fibre (STF). The short pigtailed end of the STF is attached to the centre of a thin circular nitrile diaphragm. The applied acoustic signal deforms the nitrile diaphragm and due to the affixation, the STF structure gets modified leading to change in the bending angles of the two STF bends. As a consequence, the photodetector output, detecting the reflected light intensity of the STF, varies in accordance with the applied acoustic signal. Various properties of the proposed sensing setup can be easily tailored by changing the diaphragm diameter and thickness, and the shapes and size of the STF. For an optimized configuration, the proposed sensor achieves a sensitivity of 3.07 mV Pa −1 and a minimum detectable pressure of 36.48 mPa Hz −1 . The sensor shows a linear behaviour up to 1300 Hz and the experimental value of its first order natural frequency is

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“…There exist different approaches depending on the desired outcomes. Linear variable displacement transducers (LVDTs) are usually employed in masonry structures for the monitoring of crack amplitudes and their evolution in time . Flat‐jacks offer a moderately destructive test to assess the local vertical stress and elastic modulus of masonry .…”

Section: Introduction and Research Aimmentioning

confidence: 99%

“…Linear variable displacement transducers (LVDTs) are usually employed in masonry structures for the monitoring of crack amplitudes and their evolution in time. 13 Flat-jacks offer a moderately destructive test to assess the local vertical stress and elastic modulus of masonry. 14 Concerning contactless sensing technologies, Lubowiecka et al 15 used laser scanning to accurately reconstruct the geometry of a medieval masonry bridge, as well as ground-penetrating radar (GPR) to investigate its internal structure.…”

Section: Introduction and Research Aimmentioning

confidence: 99%

Earthquake‐induced damage detection and localization in masonry structures using smart bricks and Kriging strain reconstruction: A numerical study

García‐Macías

Ubertini

2018

Earthq Engng Struct Dyn

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Summary The intrinsic vulnerability of masonry structures to seismic events makes structural health monitoring of the utmost importance for the conservation of the built heritage. The development of piezoresistive bricks, also termed smart bricks, is an innovative technology recently proposed by the authors for the monitoring of such structures. Smart bricks exhibit measurable variations in their electrical properties when subjected to external loads or, alternatively, strain self‐sensing capabilities. Therefore, the deployment of a network of smart bricks into a masonry structure confers self‐diagnostic properties to the host structure. In this light, this paper presents a theoretical investigation on the application of smart bricks to full‐scale masonry structures for seismic assessment. This includes the study of the convenience of providing electrical isolation conditions to the sensors, as well as the effectiveness of smart bricks when installed into either new constructions or in pre‐existing structures. Secondly, numerical results are presented on the seismic analysis of a three‐dimensional masonry building equipped with a network of smart bricks. Finally, in order to map the strain field throughout the structure exploiting the outputs of a limited number of sensors, an interpolation‐based strain reconstruction approach is proposed.

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Crack monitoring in historical masonry with distributed strain and acoustic emission sensing techniques

Cited by 68 publications

References 23 publications

Review on Structural Health Evaluation with Acoustic Emission

Review on Structural Health Evaluation with Acoustic Emission

S-shaped microfiber based diaphragm supported optical microphone

Earthquake‐induced damage detection and localization in masonry structures using smart bricks and Kriging strain reconstruction: A numerical study

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