Schallemissionsmonitoring zur Spanndrahtbruchdetektion

Käding, Max; Marx, Steffen; Schacht, Gregor

doi:10.1002/9783433611180.ch15

Cited by 3 publications

(6 citation statements)

References 21 publications

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“…This difference must be considered when transferring the measurement results to the specific issue of wire-break detection using AEM. Measurements conducted with the rebound-hammer on bridges or other large structures are documented in [14][15][16][17][18]. In some of these studies, wire-breaks were intentionally generated to compare signal characteristics.…”

Section: Of 23mentioning

confidence: 99%

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Acoustic Emission Monitoring in Prestressed Concrete: A Comparative Study of Signal Attenuation from Wire-Breaks and Rebound-Hammer Impulses

Käding,

Marx

2024

Preprint

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Acoustic emission monitoring (AEM) has emerged as an effective technique for detecting wire-breaks resulting from, e.g., stress corrosion cracking, and its application on prestressed concrete bridges is increasing. The success of this monitoring measure depends crucially on a carefully designed sensor layout. For this the attenuation of elastic waves within the structure’s material is determined ideally in-situ through object-related measurements with a reproducible signal source, typically a rebound-hammer. This assumes that the attenuation coefficients derived from rebound-hammer tests are comparable to those from wire-breaks, thus allowing their results to be directly applied to wire-break detection without further adjustments. This study challenges this assumption by analysing attenuation behaviour through an extensive dataset. Employing time-domain and frequency analysis, the research generates attenuation profiles from laboratory experiments and in-situ measurements across various girders and bridge structures, extracting the slope and standard deviation of the residuals. While generally validating this approach, the findings highlight differences in attenuation behaviour from among wire-break signals and rebound-hammer impulses, whereby the latter potentially underestimates the relevant attenuation of wire-breaks by approximately 20 %. Consequently, a transfer factor is proposed to adjust object-related measurement results for wire-break scenarios, including a variance of 1.0 dB/m to cover a 95 % confidence interval for sample scattering. Moreover, the anisotropic attenuation behaviour across different structures was studied, showing that transverse attenuation consistently exceeds the longitudinal, significantly influenced by structural features such as voids. In prefabricated concrete bridges with in-situ-cast concrete slabs, transverse signal transmission remains unhindered across multiple elements. Finally, the results provide a valuable reference for the design of sensor layouts in bridge monitoring, particularly benefiting scenarios where direct in-situ experiences are lacking.

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Section: Of 23mentioning

confidence: 99%

“…These girders were predominantly in an undamaged state. Detailed descriptions of the girders and documentation of these experiments are available in [13,18]. Briefly, these are:…”

Section: Experiments On Bridge Girders Under Laboratory Conditionsmentioning

confidence: 99%

Acoustic Emission Monitoring in Prestressed Concrete: A Comparative Study of Signal Attenuation from Wire-Breaks and Rebound-Hammer Impulses

Käding,

Marx

2024

Preprint

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“…These girders were predominantly in an undamaged state. Detailed descriptions of the girders and documentation of these experiments are available in [13,18]. Briefly: Measurements on each girder followed a consistent methodology, as depicted in Figure 3.…”

Section: Experiments On Bridge Girders Under Laboratory Conditionsmentioning

confidence: 99%

“…Measurements conducted with the rebound hammer on bridges or other large structures are documented in [14][15][16][17][18]. In some of these studies, wire breaks were intentionally generated to compare signal characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…The corresponding attenuation coefficients, determined based on the peak amplitudes of the measured signals, ranged from 2.6 to 7.0 dB/m. These studies primarily used sensors operating in the frequency spectrum below 200 kHz; a tabular overview of the results can be found in [18]. However, these studies focused mostly on one specific test object, with attenuation not being the central focus of investigation.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Emission Monitoring in Prestressed Concrete: A Comparative Study of Signal Attenuation from Wire Breaks and Rebound Hammer Impulses

Käding,

Marx

2024

Applied Sciences

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Acoustic emission monitoring (AEM) has emerged as an effective technique for detecting wire breaks resulting from, e.g., stress corrosion cracking, and its application on prestressed concrete bridges is increasing. The success of this monitoring measure depends crucially on a carefully designed sensor layout. For this, the attenuation of elastic waves within the structure’s material is ideally determined in situ through object-related measurements (ORMs) with a reproducible signal source, typically a rebound hammer. This assumes that the attenuation coefficients derived from rebound hammer tests are comparable to those from wire breaks, thus allowing their results to be directly applied to wire break detection without further adjustments. This study challenges this assumption by analysing attenuation behaviour through an extensive dataset. Employing time-domain and frequency analysis, the research generates attenuation profiles from laboratory experiments and in situ measurements across various girders and bridge structures, extracting the slope and residual standard deviation (RSD). While generally validating this approach, the findings highlight differences in attenuation behaviour from among wire break signals and rebound hammer impulses, whereby the latter potentially underestimates the relevant attenuation of wire breaks by approximately 20%. Consequently, a transfer factor is proposed to adjust ORM results obtained with the rebound hammer for wire break scenarios. It consists of a scaling factor of 1.2 to modify the average attenuation coefficient and a constant term of ±1.0 dB/m to cover a 95% confidence interval, and thus, account for sample scattering. Moreover, the anisotropic attenuation behaviour across different structures was studied, showing that transverse attenuation consistently exceeds the longitudinal, significantly influenced by structural features such as voids. In prefabricated concrete bridges with in situ-cast concrete slabs, transverse signal transmission remains unhindered across multiple elements. Finally, the results provide a valuable reference for the design of sensor layouts in bridge monitoring, particularly benefiting scenarios where direct in situ experiences are lacking.

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Some developments in the field of non‐destructive testing ‐ new devices and techniques, industrial training and academic education

Grosse,

Algernon,

Arndt

et al. 2023

ce papers

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Non‐destructive testing in civil engineering is a fast‐emerging field. This includes not only new devices, sensors, and techniques for the inspection of materials, components, and structures contributing to building information modeling (BIM) but also efficient concepts for structural health monitoring in the frame of digital twins. The paper highlights some of these new developments and examples for applications covering the design of new construction materials, quality control during construction, contributions to predictive maintenance, and finally the rehabilitation and repair of structures.The new demands and techniques require new training concepts for the qualification of experts for the construction industry but also well‐structured courses for the academic education of students. Some new standards for training and education will be introduced. This paves the way for modern, efficient, and reliable applications of non‐destructive testing and structural health methods.

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Schallemissionsmonitoring zur Spanndrahtbruchdetektion

Cited by 3 publications

References 21 publications

Acoustic Emission Monitoring in Prestressed Concrete: A Comparative Study of Signal Attenuation from Wire-Breaks and Rebound-Hammer Impulses

Acoustic Emission Monitoring in Prestressed Concrete: A Comparative Study of Signal Attenuation from Wire-Breaks and Rebound-Hammer Impulses

Acoustic Emission Monitoring in Prestressed Concrete: A Comparative Study of Signal Attenuation from Wire Breaks and Rebound Hammer Impulses

Some developments in the field of non‐destructive testing ‐ new devices and techniques, industrial training and academic education

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