Ultrasound monitoring for evaluation of damage in reinforced concrete

Rucka, Magdalena; Wilde, Krzysztof

doi:10.1515/bpasts-2015-0008

Cited by 25 publications

(28 citation statements)

References 22 publications

(22 reference statements)

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“…Introducing strain-displacement operator B (e) = DN (e) yields (11) with standard definitions of the stiffness matrix K (e) , mass matrix M (e) : (12) and the element load vector p (e) :…”

Section: A Novel Formulation Of 3d Spectral Element For Wave Propagatmentioning

confidence: 99%

“…As an example, a reinforced concrete specimen was chosen, on the basis of the previous experimental results presented in paper [11]. Therefore, it was possible to compare numerical results with experimental ones.…”

Section: Numerical Analyses Of Wave Propagation In Reinforced Concretementioning

confidence: 99%

“…The advantage of wave propagation-based methods is that they may be used in automatic structural health monitoring (SHM) systems. It has been demonstrated that wave propagation methods can be efficiently applied in monitoring of the strain changes in reinforced concrete during the process of damage development [10][11][12][13]. Wave propagation signals collected during an experiment conducted on concrete structures are characterized by a greater degree of complexity than for steel thin rods [14] or plates [15] because of the solid geometry of typical concrete element.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical simulations have been conducted on cuboid concrete specimens reinforced with two steel bars. Different degradation models were considered to reflect the real behaviour of bended beams described in [11]. …”

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confidence: 99%

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A novel formulation of 3D spectral element for wave propagation in reinforced concrete

Rucka

Witkowski²,

Chróścielewski³

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The paper deals with numerical simulations of wave propagation in reinforced concrete for damage detection purposes. A novel formulation of a 3D spectral element was proposed. The reinforcement modelled as the truss spectral element was embedded in the 3D solid spectral finite element. Numerical simulations have been conducted on cuboid concrete specimens reinforced with two steel bars. Different degradation models were considered to study the real behaviour of bended beams. In wave propagation modelling the spectral element method (SEM) plays an important role [16]. The SEM method is based on the high-order finite elements, usually of class C 0 . As a special feature, the elements have their nodes distributed both in physical space and in parent elements according to the Gauss-Lobatto-Legendre quadrature rule. As a consequence, it is possible to obtain a diagonal mass matrix at the element level which in turn, when appropriately taken into account, leads to fast and efficient time marching scheme. A multitude of aspects pertaining to SEM, especially for modelling of seismic waves (e.g. [17,18]) as well as for wave propagation for SHM purposes (e.g. [19]), have been already discussed. Spectral elements have been also developed for structural type finite elements like rods, beams or plates (e.g. [14,15,[20][21][22][23][24][25][26][27]), with the attention paid to theoretical aspects of wave propagation phenomena. In paper [28], 3-dimensional spectral elements have been presented, with application to damage detection in metal plate structures. Unbounded structures need a special treatment to preserve the dissipation of the energy in the infinite. The use of absorbing layers has been proposed in [29], on the example of a 1-dimensional rod and a 3-dimensional half-cylindrical shell. As far as damage detection is concerned, various techniques applied to simulation of damage effects have been considered. One can refer for instance to [20][21][22] where discontinuities in the form of cracks/caverns or point masses have been accounted for. A semi-analytical approach in analysis of flexural wave propagation through a slender beam, with a breathing edge-crack, is developed in [30]. In the context of non-homogenous material reference [31] discusses the use of the SEM with functionally graded material (FGM). To the authors' best knowledge, the problem of wave propagation in damaged reinforced concrete with the use of SEM has been not investigated.The present study focuses on development of a novel 3D spectral element for wave propagation in reinforced concrete subjected to mechanical degradation. Numerical simulations have been conducted on cuboid concrete specimens reinforced with two steel bars. Different degradation models were considered to reflect the real behaviour of bended beams described in [11].

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“…Introducing strain-displacement operator B (e) = DN (e) yields (11) with standard definitions of the stiffness matrix K (e) , mass matrix M (e) : (12) and the element load vector p (e) :…”

Section: A Novel Formulation Of 3d Spectral Element For Wave Propagatmentioning

confidence: 99%

Section: Numerical Analyses Of Wave Propagation In Reinforced Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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A novel formulation of 3D spectral element for wave propagation in reinforced concrete

Rucka

Witkowski²,

Chróścielewski³

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…In 2015, a special issue of the Bulletin of the Polish Academy of Sciences: Technical Sciences dedicated to diagnosis and durability of buildings was published [13]. Studies published in that issue: K. Flaga [14]; Z. Owsiak et al [15,16]; Z. Rusin et al [17]; L. Czarnecki, P. Woyciechowski [18]; B. Goszczyńska et al [19]; K. Wilde et al [20]; A. Garbacz [21]; Z. Hoła [22]; M. Iwański [23]; A. Szydło [24]; A. Piekarczuk et al [25]; M. Kolbrecki [26]; D. Kowalski et al [27] are considerable evidence of achievements and research ambitions in this area.…”

Section: Czarnecki and D Van Gemert Scientific Basis And Rules Ofmentioning

confidence: 99%

Scientific basis and rules of thumb in civil engineering: conflict or harmony?

Czarnecki

Gemert

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. Science and engineering intermingle in the area of construction. Engineering works, often of great dimensions and design life cycle of many decades, have to be designed on a scientific basis since the safety of hundreds of users depends on their design. The task of scientific institutions is to define the construction performance within categories that correspond to the contemporary level of knowledge and technology. A construction appraiser who speaks out in a way that ensures unquestionable competence about the performance of elements and buildings (existing and under construction), should be convinced of the scientific basis of his opinions. A comparison of construction sections vs. basic requirements presents an archetype of the science of construction. A matrix of the science of construction reveals its multi-faceted nature; if related to time -the issue of durability has to be considered, and if related to the scale -the complexity. Defining the construction performance in terms of technical features is a constant search for a relationship between the material model and the usability model of a building. The construction industry uses a lot of "rules of thumb", more than any other sector of technology. In the era of computer-aided design, CAD, and building information modelling (BIM), those rules of thumb remain invaluable verification tools.Key words: building performance, appraiser, matrix of the science of construction, rules of thumb, durability, complexity, diversified development. Scientific basis and rules of thumb in civil engineering Defining building performanceThe primary task of universities and research institutes in the scientific discipline of construction is to continuously define building performance in a manner consistent with the current level of knowledge and technology. This means permanently seeking true solutions [2] -the relationship between the two corresponding models [3]: the material model (material model is used here to represent materials, analyses and geometries) and the usability model, which combines properties and requirements (Fig. 1).

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Real‐time object detection using power spectral density of ground‐penetrating radar data

Saghafi

Jazayeri

Esmaeili

et al. 2019

Struct Control Health Monit

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A statistical analytical monitoring scheme is developed that utilizes maximum energy of ground-penetrating radar signals to detect hidden buried objects and estimate their location and depth automatically. The maximum energy is calculated for locations by Welch's power spectral density estimation. Using the proposed analytic, the maximum energy is tightly monitored for a significant change from reference signals generated using target-free locations.A warning message is triggered when monitoring process detects a site with potential buried objects, on average, 90 cm (2.95 ft) away from the object for 800-MHz antenna. Continuing the ground-penetrating radar scan in the same direction and monitoring the signals, the procedure uses a sophisticated hyperbola-mapping method to estimate the location and depth of buried objects with high accuracy. The analytics could successfully pinpoint the location and depth of hidden objects, respectively, with mean absolute error of 0.38 and 2.03 cm in synthetic noisy environments. Reliable performance of the proposed analytics in real cases that run in real-time for multiple object detection even in noisy media proves its efficiency for real-life exploration.

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Ultrasound monitoring for evaluation of damage in reinforced concrete

Cited by 25 publications

References 22 publications

A novel formulation of 3D spectral element for wave propagation in reinforced concrete

A novel formulation of 3D spectral element for wave propagation in reinforced concrete

Scientific basis and rules of thumb in civil engineering: conflict or harmony?

Real‐time object detection using power spectral density of ground‐penetrating radar data

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