Detecting minute damage in beam-like structures using the neutral axis location

Sigurdardottir, Dorotea; Glišić, Branko

doi:10.1088/0964-1726/23/12/125042

Cited by 43 publications

(22 citation statements)

References 15 publications

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“…This study also concluded that the accuracy in locating the neutral axis depends on strain magnitude as well as the sample size. Later on, the same authors reported on another location on the same bridge where a bimodal distribution was observed [16]. The lower peak of that distribution was consistent with the observations of Oshima and Kado [18] whereas the existence of higher peak has only been reported on a large scale test structure [16].…”

Section: Traffic and Ambient Loading On Real Structuressupporting

confidence: 79%

“…However, the neutral axis was located significantly higher than the centroid both at the delaminated cross-section and at the cracked cross-section. The upward movement of the neutral axis is inconsistent with other observations reported in the literature; however, it is consistent with observations from an in-service structure [16]. A probabilistic approach using Z-score hypothesis testing was developed to evaluate the likelihood of damage, i.e.…”

Section: Controlled Testing Of Real Structuressupporting

confidence: 53%

“…The same researchers installed long-gauge fiber-optic sensors on a large scale testing model of a composite bridge, with three steel girders supporting a concrete slab [16]. Artificial damage was introduced into the concrete deck with plastic sheets.…”

Section: Controlled Testing Of Real Structuresmentioning

confidence: 99%

“…A probabilistic approach using Z-score hypothesis testing was developed to evaluate the likelihood of damage, i.e. testing the hypothesis that the neutral axis location is different from the centroid [7,16,17]. The method is summarized in Fig.…”

Section: Controlled Testing Of Real Structuresmentioning

confidence: 99%

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The neutral axis location for structural health monitoring: an overview

Sigurdardottir

Glišić

2015

J Civil Struct Health Monit

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Structural health monitoring (SHM) is the process of continuously or periodically measuring structural parameters over time and the transformation of the acquired data into information about the actual structural behavior. The main goal of SHM is to provide quantitative and actionable information to infrastructure managers on a system-wide level. However, to achieve this goal, damage sensitive universal parameters need to be researched, identified, and implemented into SHM processes and data analysis. The neutral axis location has been identified as a potential parameter for damage detection, performance evaluation, and condition assessment of beam-like structures. This paper is intended to serve as a reference for researchers who are interested in the state of the art in evaluation of the neutral axis location, facts about the neutral axis behavior, and challenges associated with using the neutral axis for SHM purposes. Studies of the neutral axis in laboratory settings, controlled on-site testing, and on real structures in on-site conditions are presented and discussed. The main difficulties in using the neutral axis location for SHM purposes that are identified in this paper are: (1) its sensitivity to environmental effects such as temperature, humidity, and loading positions, (2) its natural variation in healthy cross-sections, (3) quantification of its sensitivity to damage, i.e. its damage detection capabilities in terms of the damage size and its distance from sensors, and (4) correlation between the neutral axis location and the capacity, performance, and condition of the monitored structure. The proof of concept has been provided with numerical modeling, and in the laboratory, and to some extent through controlled testing; however, a general onsite validation still remains a major challenge.

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Section: Traffic and Ambient Loading On Real Structuressupporting

confidence: 79%

Section: Controlled Testing Of Real Structuressupporting

confidence: 53%

Section: Controlled Testing Of Real Structuresmentioning

confidence: 99%

Section: Controlled Testing Of Real Structuresmentioning

confidence: 99%

See 2 more Smart Citations

The neutral axis location for structural health monitoring: an overview

Sigurdardottir

Glišić

2015

J Civil Struct Health Monit

Self Cite

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“…The sensor network was installed during the construction of the model structure. One of the goals of the AN-DERS project was to use the monitoring system to detect prescribed minute damage inside the concrete slab [7]. Therefore, sensors were placed near two locations of minute damage and one healthy reference location.…”

Section: Test Structure and Monitoring Methodologymentioning

confidence: 99%

Evaluating early‐age shrinkage effects in steel concrete composite beam‐like structures

Glišić

2017

Steel Construction

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The shrinkage of concrete is a material phenomenon that occurs due to the reduction in the concrete's volume over time. In composite beam-like structures, the shrinkage of concrete elements affects strains and stresses in the overall composite section. The ability to identify and estimate early-age shrinkage in beam-like structures allows the creation of a baseline for strain-based structural health monitoring, and enables a more thorough understanding of structural performance and condition. In this project, the early-age shrinkage behaviour of steel-concrete composite beam structures was studied with an integrated approach using monitoring data from a reduced-scale test structure and simulation results from finite element analysis. A simplified analytical expression was developed to study further the range of magnitude of shrinkage in the concrete slab and the resultant strain distribution in steel girders. The goal of this paper is to create an innovative, comprehensive and widely applicable procedure that identifies and quantifies early-age shrinkage in steel-concrete composite beam-like structures and its effects on the overall composite cross-section.

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Guided wave propagation in H-beam and probability-based damage localization

Qiu

et al. 2016

Struct. Control Health Monit.

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H-beams are usually made of structural steel and are widely used in construction, civil, and mechanical engineering. Both the rolling process and complex working condition can yield some defects on the H-beam structures. Characteristics of guided wave propagation in H-beam are investigated in this study for damage identification by using guided wave-based structural health monitoring (SHM) technique. Wave structures are obtained for wave mode selection in H-beam SHM applications. Guided waves are excited by using piezoelectric actuators. Two excitation ways, that is, symmetric excitation and circle excitation, are studied to select appropriate wave mode for damage identification. Based on the wave propagation characteristics, probability-based diagnostic image method is proposed to estimate locations of simulated defects. In the image reconstruction process, arithmetic averagebased and geometric average-based methods are investigated for damage localization with high precision. The results demonstrate that guided wave-based SHM technique is applicable to damage identification for H-beam structures.

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Detecting minute damage in beam-like structures using the neutral axis location

Cited by 43 publications

References 15 publications

The neutral axis location for structural health monitoring: an overview

The neutral axis location for structural health monitoring: an overview

Evaluating early‐age shrinkage effects in steel concrete composite beam‐like structures

Guided wave propagation in H-beam and probability-based damage localization

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