Acoustic Emission analysis of a comprehensive database of wire breaks in prestressed concrete girders

Käding, Max; Schacht, Gregor; Marx, Steffen

doi:10.1016/j.engstruct.2022.114846

Cited by 13 publications

(11 citation statements)

References 16 publications

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“…The results documented herein, in conjunction with reference [13], form an important basis for the development of models aimed at quantifying probability of detection (PoD) for wire-breaks in bridges. These models are to be elaborated and discussed in a forthcoming publication.…”

Section: Discussionmentioning

confidence: 93%

“…The determination of the source characteristics of a wire-break is usually based on experience, as comprehensive studies on this topic are rare. A contribution to this topic is the database mentioned in [13], which analyses a variety of events and serves also as a basis for this study. The determination of attenuation and background noise is ideally carried out directly on the structure through objectrelated measurements (ORM).…”

Section: Of 23mentioning

confidence: 99%

“…For this several measurement series are recorded with an artificial, reproducible signal source to obtain attenuation profiles and determine attenuation coefficients. The rebound-hammer is often used as a reference source for this purpose [13,14], which generates a strong impact on the concrete surface since its impulse in the structure is necessarily very energetic. This standardised instrument enables the reliable reproduction at almost any location on the structure.…”

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%

“…Moreover, there is a considerable variation in the cross-sectional dimensions of the girders. The girders from Witzenhausen are characterized by their slender profile in the section of the wires, while the Stolpe girders feature hollow bodies that locally reduce the cross-section, as detailed in [13]. In contrast, the Roding girders are significantly more massive and contain a large number of tendons, which act as major scatterers and contribute to increased attenuation.…”

Section: Wire-breaks On Gridersmentioning

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: Discussionmentioning

confidence: 93%

Section: Of 23mentioning

confidence: 99%

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%

Section: Wire-breaks On Gridersmentioning

confidence: 99%

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