Structural health monitoring of the Colle Isarco Viaduct

Beltempo, Angela; Cappello, Carlo; Zonta, Daniele; Bonelli, Alessio; Bursi, Oreste S.; Costa, Carlo; Pardatscher, W.

doi:10.1109/eesms.2015.7175843

Cited by 6 publications

(10 citation statements)

References 4 publications

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“…On the same research line, several studies have been carried out [19][20][21][22][23][24][25]. Besides the UAV photogrammetry [26], several geomatics techniques are used in the literature for the same purpose, like total station [27][28][29], GNSS (Global Navigation Satellite System) [30][31][32] and laser scanner [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

UAV Photogrammetry for Concrete Bridge Inspection Using Object-Based Image Analysis (OBIA)

et al. 2020

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Monitoring infrastructures is becoming an important and challenging issue. In Italy, the heritage consists of more than 60,000 bridges, which need to be inspected and detected in order to guarantee their strength and durability function during nominal lifespan. In this paper, a non-destructive survey methodology for study concrete bridges surface deterioration and viaducts is presented. Terrestrial and unmanned aerial vehicle (UAV) photogrammetry has been used for visual inspection of a standard concrete overpass in L’Aquila (Italy). The obtained orthomosaic has been processed by means of Object-Based Image Analysis (OBIA) to identify and classify deteriorated areas and decay forms. The results show a satisfactory identification and survey of deteriorated areas. It has also been possible to quantify metric information, such as width and length of cracks and extension of weathered areas. This allows to perform easy and fast periodic inspections over time in order to evaluate the evolution of deterioration and plan urgency of preservation or maintenance measures.

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Section: Introductionmentioning

confidence: 99%

UAV Photogrammetry for Concrete Bridge Inspection Using Object-Based Image Analysis (OBIA)

et al. 2020

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“…However, obtaining long‐term measurements using a camera is challenging because of the associated motion caused by the wind, various weather, and the weight of the camera . Although a total station measures displacement by comparing emitted and returned modulated infrared signals, the sensor needs to be kept stationary and motionless, and prudent management of the measurement system is required to provide long‐term deflection measurements . Indirect displacement estimation is an approach that converts other responses such as acceleration, velocity, tilt, and strain to displacement .…”

Section: Introductionmentioning

confidence: 99%

“…6 Although a total station measures displacement by comparing emitted and returned modulated infrared signals, the sensor needs to be kept stationary and motionless, and prudent management of the measurement system is required to provide long-term deflection measurements. 7 Indirect displacement estimation is an approach that converts other responses such as acceleration, velocity, tilt, and strain to displacement. [8][9][10][11][12][13] However, its use has been developed and verified only with short-term measurements.…”

Section: Introductionmentioning

confidence: 99%

Long‐term displacement measurement of bridges using a LiDAR system

Lee

et al. 2019

Struct Control Health Monit

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Summary Long‐term displacement measurements provide important information about the structural safety of civil engineering structures and the associated maintenance necessary. Most approaches developed for measuring displacement, such as direct measurements using the linear variable differential transformer and computer vision‐based sensing, relate to campaign‐type sensor deployment. However, these methods have critical limitations when used to accurately measure long‐term displacement, because it is difficult in practice to appropriately handle unavoidable sensor movement. This study therefore proposes a long‐term displacement measurement method using light detection and ranging (LiDAR) that is designed for use with short‐ and medium‐span bridge structures. Reflectors that have higher reflectance than common construction materials (such as concrete and steel) are used to enhance measurement accuracy and reduce scanning time. Strategically deployed reflectors provide a reference point, which is independent of the LiDAR position. Thus, LiDAR can be temporarily installed in the field only when measurements are necessary. Expensive LiDAR systems can be employed to measure the long‐term displacement of multiple bridges cost‐effectively because permanent installation is not required. The proposed method is validated within the laboratory by focusing on LiDAR position independence and is then used during the early erection stages of a railroad bridge to measure long‐term displacement.

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“…Specifically, the excessive multidecade deflections of the aforementioned box girders and many other bridges spread throughout the world may be due to the combination of several factors (Beltempo et al., ) listed herein: (i) the cast‐in‐place segmental method used for construction; (ii) creep deformation; (iii) losses of pretensioning force in tendons; and (iv) differential shrinkage between top and bottom slabs. However, with regard to the Colle Isarco viaduct, that is, the case study of this article, any attempt to investigate the midspan deflection drift using the classical CEB‐FIP creep and shrinkage models (CEB, )—those currently recognized by Eurocode 2 (CEN, )—failed to provide a convincing explanation/prediction.…”

Section: Introductionmentioning

confidence: 99%