Model Based Evaluation of Bridge Decks Using Ground Penetrating Radar

Belli, Kimberly; Wadia-Fascetti, Sara; Rappaport, Carey M.

doi:10.1111/j.1467-8667.2007.00516.x

Cited by 32 publications

(16 citation statements)

References 32 publications

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“…The marriage of forward modeling and traditional analysis techniques has the potential to greatly aid in the solution of anomaly detection [29]. Performing forward modeling in 2D instead of 3D can provide fast results with less computational load than 3D modeling.…”

Section: Discussionmentioning

confidence: 99%

Comparison of the Accuracy of 2D vs. 3D FDTD Air-Coupled GPR Modeling of Bridge Deck Deterioration

Belli

Wadia-Fascetti

et al. 2009

Research in Nondestructive Evaluation

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Computational modeling is beneficial in the preparation for nondestructive wave-based sensing. Forward models, which can be implemented through a variety of computational modeling techniques, enable parametric evaluations to assess the functionality of a sensor under different conditions, and are integral to the solution of the inverse problem. The focus of this article is on the comparison of two-dimensional (2D) and three-dimensional (3D) Finite Difference Time Domain (FDTD) models. This article gives a presentation of the accuracy of 2D modeling by comparing FDTD simulations of reinforced bridge deck deterioration in 2D and 3D. Simulations for a healthy and delaminated bridge deck are examined. It is shown that the difference in propaga-tion between the 3D and 2D point sources must be considered and is more pronounced at greater distances from the source location. The effect of scattering from the delamination is visible and, while there is variation in amplitude between the 3D and 2D models, the shapes of the resulting waveforms (including the peak arrival times) are well matched.

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Section: Discussionmentioning

confidence: 99%

Comparison of the Accuracy of 2D vs. 3D FDTD Air-Coupled GPR Modeling of Bridge Deck Deterioration

Belli

Wadia-Fascetti

et al. 2009

Research in Nondestructive Evaluation

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“…After the rebar array depth has been determined, FDTD simulation is used to produce data at various rebar array separations and positions. The rebar spacing parameter from the simulation with a response that best fits the actual response is considered to be the actual rebar spacing [21]. The rebar depth and spacing can thus be determined automatically, and it is assumed that, for a given section of bridge deck, these values remain constant.…”

Section: Locating Rebar To Replace With Point Sourcementioning

confidence: 99%

“…The parameters are automatically calculated from a single trace computed as the mean of the simulated total field B-scan. More details about the model updating process are available in [21].…”

Section: Building the Background Responsementioning

confidence: 99%

Forward Time Domain Ground Penetrating Radar Modeling of Scattering from Anomalies in the Presence of Steel Reinforcements

Belli

Rappaport

Wadia-Fascetti

2009

Research in Nondestructive Evaluation

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Ground penetrating radar (GPR) for nondestructive testing is applied to civil infrastructure such as bridges and roadways. Conventional methods of processing and analyzing GPR data for civil infrastructure are often qualitative, using relative reflection amplitude from subsurface boundaries or reinforcing steel (rebars) as an indicator of health. A Finite Difference Time Domain (FDTD) simulation of GPR is used to generate a bridge deck response of a heterogeneous model of a healthy bridge deck. The result is a healthy deck background that can be removed from measured data to bring anomalies to attention. For the purpose of this article, the measured data is also simulated. In lieu of modeling the identified rebars as perfect electrical conductors (PECs), they are modeled as hard point source excitations to allow for examination of the effect that the scattered waves from the rebar can have on an anomaly. This is an important consideration for application of many inversion methods.

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“…Air-coupled antenna systems are much faster. They are often mounted on vehicles traveling at traffic speeds over bridge decks, thus avoiding lane closures and not impeding traffic flow [3].…”

Section: Introductionmentioning

confidence: 99%

Analytic analysis of ground penetrating radar wave scattering of reinforced concrete bridge decks

Tajdini

Rappaport

2013

2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS

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Ground penetrating radar analysis of reinforced, layered concrete bridge decks requires fast, fully three dimensional modeling for analysis and inversion of measured data. However, numerical methods are often computationally expensive and impractical for real-time use. 2D modeling is fast, but lacks a comprehensive analysis of the problem. Here, we develop and test an analytic method to effectively simulate layered concrete bridge deck reinforced by a grid of rebars, excited by air-coupled GPR. The Green's function analysis in combination with the method of moments (MoM) is utilized to efficiently model the scattering effects of the rebar buried inside a stratified bridge deck. The results are validated well with finite difference frequency domain (FDFD) method.

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Model Based Evaluation of Bridge Decks Using Ground Penetrating Radar

Cited by 32 publications

References 32 publications

Comparison of the Accuracy of 2D vs. 3D FDTD Air-Coupled GPR Modeling of Bridge Deck Deterioration

Comparison of the Accuracy of 2D vs. 3D FDTD Air-Coupled GPR Modeling of Bridge Deck Deterioration

Forward Time Domain Ground Penetrating Radar Modeling of Scattering from Anomalies in the Presence of Steel Reinforcements

Analytic analysis of ground penetrating radar wave scattering of reinforced concrete bridge decks

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