NDT Monitoring of Bridges using Innovative High Precision Surveying System

Casadei, Paolo; McCombie, Paul; Galati, Nestore; Nanni, Antonio

doi:10.2749/222137806796185698

Cited by 5 publications

(3 citation statements)

References 6 publications

(5 reference statements)

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“…Along with the development of technology, there has also been an automation of geodetic measurements, an example of which is a laser sensor of vibrations, deflections and deformations [16]. Integrated monitoring with the use of automated measuring devices is successfully used in larger facilities, such as bridges and water dams [17].…”

Section: Measurement Methods Used To Assess Mining Influencesmentioning

confidence: 99%

Assessment of Visual Representation Methods of Linear Discontinuous Deformation Zones in the Right-of-Way

Wróblewska

Grygierek

2022

Applied Sciences

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Mining impacts on the ground surface may manifest themselves, inter alia, in the form of continuous and discontinuous deformations. Discontinuous deformations significantly deteriorate the condition of the road surface, posing a threat to the safety of use. Therefore, in mining areas, it is necessary to carry out an ongoing inspection of the condition of objects and thus determine the need and scope of their repair. The key method of assessing the scope of the surface repair needed is to observe the road surface. This article presents the results of selected measurement methods carried out near discontinuous deformation zones in the right-of-way. The use of measurements with the use of a laser profilograph allowed determining the evenness of the tested pavement. Additionally, geodetic methods were used: leveling and GPS satellite positioning, to determine the displacement of points forming the observation lines along the right-of-way. In order to identify, in detail, linear discontinuous deformations, non-ceiling photogrammetry was used with the use of an unmanned aerial vehicle. The comparison of selected methods and their advantages and disadvantages allowed for the assessment of their usefulness in visual representation zones of linear discontinuous deformations. The results of this research show the usefulness of laser profilographs, while the greatest detail of the measurement was obtained by low-ceiling photogrammetry with the use of an unmanned aerial vehicle.

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Section: Measurement Methods Used To Assess Mining Influencesmentioning

confidence: 99%

Assessment of Visual Representation Methods of Linear Discontinuous Deformation Zones in the Right-of-Way

Wróblewska

Grygierek

2022

Applied Sciences

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“…On the contrary, measurements made by total stations or digital levels are not disturbed with these effects and enable deflection measurements with an accuracy better than 0.2 mm. 10,11 Nevertheless, this technique cannot be applied in bad weather conditions that limit visibility or to perform the dynamic measurements because of the low sampling rate.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of a civil structure’s state based on noncontact measurements

Kohut

Holak

Uhl

et al. 2013

Structural Health Monitoring

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In this article, the comparison of two noncontact measurement methods dedicated to civil engineering structures' state examination is presented. The vision-based method computes the displacement field of the analyzed structure by means of the digital image correlation coefficient. The system consists of one or more high-resolution digital cameras mounted on a head or on portable tripods. The developed methodology and created software application embedded in an MS-Windows operating system are presented. The second system measures the deflection of the structures by means of a radar interferometer. In both cases, it is possible to measure many points on the structure simultaneously. This article presents a comparison of the displacement field measurement performed on a field setup, as well as the span of a steel bridge designed for tram traffic. Both systems are described, with special attention given to their application in measurements of civil engineering structures. This article demonstrates a preliminary test performed to verify both of the noncontact systems in relation to high-accuracy measurement devices, the precise surveying level, and the electronic dial indicator of displacement. The experiment was designed intentionally to simulate the geometric conditions of the real structure, but the displacement values were generated and controlled by the operator. As a key study, a steel viaduct subjected to an operational load was measured, as a type of structure for which the observation is required in terms of structural health monitoring. It was subjected to the operational load caused by tram traffic. Both examined systems were applied. The accuracy analysis of both systems was investigated, and the obtained results were discussed.

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“…Examples of non-contact sensors include Laser Doppler Vibrometer (Cunha and Coetano [1], Casadei et al [2]), Global Positioning Systems (Nickitopoulou et al [3]) and vision-based systems using digital image processing techniques (Lee and Shihozuka [4]). …”

Section: Introductionmentioning

confidence: 99%

An interferometric radar for remote sensing of deflections on large structures

Gentile

Bulgarelli

Gallino

et al. 2009

WIT Transactions on the Built Environment

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Recent progresses in radar techniques have favoured the development of microwave interferometers, suitable for the non-contact monitoring of large structures. The main characteristic of the new radar systems  entirely designed and developed by Italian researchers  is the possibility of simultaneously measuring the static or dynamic deflection of several points on a large structure with high accuracy.In this paper, some techniques implemented in the microwave interferometers are summarized in order to highlight advantages and potential issues of the radar-based measurement; afterwards, the accuracy and simplicity of the radar technology is demonstrated in applications to full-scale bridges.

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NDT Monitoring of Bridges using Innovative High Precision Surveying System

Cited by 5 publications

References 6 publications

Assessment of Visual Representation Methods of Linear Discontinuous Deformation Zones in the Right-of-Way

Assessment of Visual Representation Methods of Linear Discontinuous Deformation Zones in the Right-of-Way

Monitoring of a civil structure’s state based on noncontact measurements

An interferometric radar for remote sensing of deflections on large structures

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