Rebar detection — POD approach to determine the reliability of GPR systems and to quantify the influence of different material parameters

Feistkorn, Sascha

doi:10.1109/icgpr.2016.7572601

Cited by 7 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With regard to the ultrasonic and ground penetrating radar (GPR) inspections emphasized in this paper, it should be noted that the quantification of accuracy in locating construction elements inside the concrete such as reinforcement or tendons implies that the objects of interest could be reliably detected objectively. The development of probability of detection (POD)‐curves can yield valuable conclusions in this context 16–18 . POD is delimited in the present article.…”

Section: Concept and Significance Of Measurement Uncertainty In Stochastic Modelingmentioning

confidence: 98%

Reliability assessment of existing structures using results of nondestructive testing

Küttenbaum

Braml

Taffe

et al. 2021

Structural Concrete

View full text Add to dashboard Cite

Making optimal decisions about the reliability of existing structures requires that the information used in assessment adequately represents the properties and the condition of the structures. The knowledge gap regarding a structure to be assessed can be successively filled by individually purposeful observations on site. This paper gives an overview of an approach for utilizing nondestructively gathered measurement results in reliability assessment of existing structures. An essential part of measurement‐based stochastic modeling of basic variables is the calculation of measurement uncertainties, which serves to establish confidence in measurement, to ensure the comparability of unambiguously expressed measurement results, and to quantify the quality of the measured information. Regarding the current discourse on how to treat information collected on‐site in the context of assessment, the authors recommend that measurement uncertainty becomes an uncertainty component mandatorily to be represented in measurement‐based stochastic models. The main steps of the proposed concept are presented, and the advantages of its application are emphasized by means of a prestressed concrete bridge as case study. The bridge is assessed regarding the serviceability limit state decompression using ultrasonic and radar data measured at the structure.

show abstract

Section: Concept and Significance Of Measurement Uncertainty In Stochastic Modelingmentioning

confidence: 98%

Reliability assessment of existing structures using results of nondestructive testing

Küttenbaum

Braml

Taffe

et al. 2021

Structural Concrete

View full text Add to dashboard Cite

show abstract

“…Probability of Detection (POD) analyses can be used to assess, e.g., how reliably a steel rebar can be detected in a certain mounting depth. A key parameter influencing the GPR performance is the component moisture, which leads to a strong travel path dependent weakening of the electromagnetic impulse, so that the POD increases significantly when moisture decreases, e.g., due to concrete aging [15]. The needs regarding comparability, precision and trueness can be met by measurement uncertainty calculations.…”

Section: Non-destructive Concrete Testingmentioning

confidence: 99%

Ways to unlock the potential of non-destructive concrete testing for the reliability assessment of our built environment

Küttenbaum

Maack

Aßmann

et al. 2023

8th International Workshop on Reliability of NDT/NDE

View full text Add to dashboard Cite

Sustainability efforts and global climate targets coincide with degradation of the built environment. Changes in use, increasing loads, and—especially in transport infrastructure— sharply rising traffic flows are encountering an infrastructure that has largely reached or exceeded its service life. During the entire lifecycle of structures and materials, the engineer needs to decide which action(s) are optimal, e.g., most eco-efficient at what time. This decision-making process is based on the reassessment of the structure or network, which depends substantially on the information available about the system. It is well known that available and continuously further developed NDT methods allow the collection of manifold information highly relevant in structural assessment. However, the condition (i.e., the quality) of the information measured on-site and the reliability of inspection systems need to be known before NDT results can be used in such safety-relevant calculations. This contribution attempts to shed light on the application of POD analyses and measurement uncertainty calculations in nondestructive testing of concrete structures to provide useful and quality-assured information for reliability assessments of our built environment—with an emphasis on ground penetrating radar. It is shown that signal processing techniques affect POD analysis results to varying degrees, that measurement uncertainties are useful to validate PODs, and that the utilization of both POD analysis and measurement uncertainty calculations can pave the way to NDT-based reliability assessment, which will be exemplarily demonstrated in conclusion—generally aiming to derive those maintenance strategies and actions that are in line with actual demands.

show abstract

“…Thus, the service life assessment requires high reliability which is only achievable with the knowledge about the reliability of the applied inspection methods. However, reliability assessments of NDT methods are very rare in the eld of civil engineering until today [2][3][4]. Typically, they are performed on mock-ups speci cally designed for this purpose [5].…”

Section: Introductionmentioning

confidence: 99%

Design of mock-ups for ultrasonic testing in civil engineering using numerical simulations

Dethof,

Keßler

2023

Preprint

View full text Add to dashboard Cite

The major objective when applying non-destructive testing (NDT) in civil engineering is the detection of defects such as honeycombs. Defects can impair the service life of structures and could lead in the worst case to fatal failures. All structures such as bridges, tunnels, locks etc. are unique objects with variation in geometry, dimensions, materials, environmental condition, load scenarios etc. Thus, the interpretation of NDT data is challenging and the validation of the NDT method, the training of inspectors and the reliability analysis of NDT rely on mock-ups with known defect situations mimicking the type of defect as realistic as possible. The considered defect sizes should cover the transition zone between detectable and non-detectable to properly evaluate the capability of the inspection system. However, knowledge about the limits of an inspection system is mostly non-existent. To overcome this limitation, this study applies numerical simulations for ultrasonic testing in reinforced concrete performed with the elastodynamic finite integration technique (EFIT) to identify this transition zone. First, the study shows the development and the validation of a numerical representation of concrete considering the implementation of a qualitatively realistic noise level. Additionally, the accurate representation of the sources during ultrasonic testing is confirmed by an investigation of the radiation characteristic for dry point contact ultrasonic transducers. The simulation outcome enabled the design of a mock-up for the detection of honeycombs applying ultrasonic testing considering major influencing factors. A case study completes the study demonstrating the applicability of the design scheme based on numerical simulation. In the real specimen, \(68\text{\%}\) of the implemented defects are detectable proving the effectiveness of the design method.

show abstract

Rebar detection — POD approach to determine the reliability of GPR systems and to quantify the influence of different material parameters

Cited by 7 publications

References 4 publications

Reliability assessment of existing structures using results of nondestructive testing

Reliability assessment of existing structures using results of nondestructive testing

Ways to unlock the potential of non-destructive concrete testing for the reliability assessment of our built environment

Design of mock-ups for ultrasonic testing in civil engineering using numerical simulations

Contact Info

Product

Resources

About