Fiber Bragg grating-based long-gauge fiber optic sensor for monitoring of a 60m full-scale prestressed concrete girder during lifting and loading

Kim, Tae Min; Kim, Do Hak; Kim, Moon Kyum; Lim, Yun Mook

doi:10.1016/j.sna.2016.10.037

Cited by 27 publications

(13 citation statements)

References 20 publications

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“…Concerning the health monitoring of concrete structures, there are several cases of application of fiber Bragg grating sensors on the surface of the load bearing structure, e.g., existing bridge, particularly in bad technical condition [12][13][14][15]. Gebremichael et al [16] tested a multiplexed FBG sensor system enabling monitoring of dynamic load events on a 346-m road bridge in Norway.…”

Section: Introductionmentioning

confidence: 99%

Laboratory and In-Situ Testing of Integrated FBG Sensors for SHM for Concrete and Timber Structures

Čápová

Velebil

Včelák

2020

Sensors

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Long-term structural health monitoring (SHM) plays an important role in the safety of public transport infrastructure such as bridges or tunnels and warns in the event of any emerging problem. This article describes development and testing of system based on fiber Bragg grating (FBG) sensors that can detect changes in strain and temperature. The first phase of the research has been focused on the development of new fiber optic sensors for the monitoring of concrete structures and their investigation in laboratory conditions. The work also shows novel applicability of the same FBG technology for glulam structures. Mechanical loading tests of the concrete beam as well as glulam beam with embedded sensors were carried out. Data measured by developed fiber optic sensors were compared with the readings from reference sensors as well as with the analytically calculated values. The achieved results proved good agreement between the measured data, analytical data and reference methods. In second phase of the research, the pilot installation of the sensors was carried out on the newly constructed prestressed-concrete bridge. The bridge was monitored throughout pre-stressing phase and monitoring continued after the completion of the construction works. Problems with the fragility of the sensors occurred during the measurements, but the obtained results provide a good basis for further improvement of the system.

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Section: Introductionmentioning

confidence: 99%

Laboratory and In-Situ Testing of Integrated FBG Sensors for SHM for Concrete and Timber Structures

Čápová

Velebil

Včelák

2020

Sensors

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“…Typically, Huynh et al [11] embedded optical fiber sensors in unbonded prestressed concrete beams to monitor the stress loss of prestressing tendons under temperature. Kim et al [12] used fiber optic sensors to monitor the stress variation of the 60 m span beam during the whole construction process. Compared with the traditional Bragg grating, the advantage is that these sensors can still effectively monitor the strain after the concrete has begun cracking.…”

Section: Introductionmentioning

confidence: 99%

Length Effect on the Stress Detection of Prestressed Steel Strands Based on Electromagnetic Oscillation Method

Zhang

et al. 2019

Sensors

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Prestress detection of structures has been puzzling structural engineers for a long time. The inductance–capacitance (LC) electromagnetic oscillation method has shown a potential solution to this problem. It connects the two ends of a steel strand, which is simulated as an inductor, to the oscillation circuit, and the stress of the steel strand can be calculated by measuring the oscillation frequency of the circuit through a frequency meter. In the previous studies, the authors found that stress-frequency relation of 1.2 m steel strand was negatively correlated, while the stress-frequency of 10 m steel strand was positively correlated. To verify this conflict, two kinds of electrical inductance models of steel strands were established to fit the lengths. With the models, the stress-frequency relations of steel strands with different lengths were analyzed. After that, two kinds of experimental platforms were set up, and a series of stress-frequency relationship tests were carried out with 1.2 m, 5 m, 10 m and 15 m steel strands. Theoretical analysis and experimental results show that when the length is less than 2.013 m, the stress and oscillation frequencies are negatively correlated; when length is more than 2.199 m, the stress and oscillation frequencies are positively correlated; while when length is between 2.013 m and 2.199 m, the stress-frequency relationship is in transit from negative correlation to positive correlation.

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“…Para el caso que se ocupa este artículo, su enfoque es a la ingeniería Civil, para medir sobrecarga vehicular con un tipo de sensor basado en fibra óptica del tipo puntual. Específicamente, algunas de las aplicaciones de los sensores basados en fibra óptica en la ingeniería civil (vías asfálticas) se enfocaron en la medida de corriente polarimétrico (FBG: Fiber Bragg Grating y sensores totalmente distribuidos) para medir deformación longitudinal y microdeformación en losas (Kim et al, 2016;Chatti et al, 2008) con respuesta lineal y alta resolución. Otras usaron la reflectometría óptica (sensor distribuido lineal OTDR) para la detección de grietas (Childs et al, 2008;Bravo et al, 2012); también se utilizaron técnicas de modulación de la luz dispersada en inhomogeneidades aleatorias del índice de refracción del sensor para medir tensión en muestras de concreto (Chaube et al, 2008).…”

Section: Introductionunclassified

Modelo Teórico de Sensor basado en el Principio de la Reflectometría de Luz sobre Fibra Óptica para Detección de Sobrecarga Vehicular

et al. 2019

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El objetivo de la investigación es la propuesta de un modelo teórico para caracterizar un sensor de fibra óptica. Para lograrlo, se caracterizó el cambio de las propiedades de los rayos de luz que se propagaban por el núcleo de la fibra, cuando el medio sufría un doblez proporcional a la deformación de un conjunto de cuatro muelles que soportaban el peso de un vehículo del tipo C2 (dos ejes). La deformación alteró el ángulo del doblez de la fibra de vidrio, que a su vez afectó la propagación de la luz debido a la presencia de ondas reflejadas y refractadas; este evento modificó la magnitud del coeficiente de transmisión (T) que se evaluó en el receptor. Este artículo presenta el estudio experimental-bajo condiciones controladas-, el registro, análisis de datos y regresión para modelar el sensor mediante una ecuación algebraica.

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Fiber Bragg grating-based long-gauge fiber optic sensor for monitoring of a 60m full-scale prestressed concrete girder during lifting and loading

Cited by 27 publications

References 20 publications

Laboratory and In-Situ Testing of Integrated FBG Sensors for SHM for Concrete and Timber Structures

Laboratory and In-Situ Testing of Integrated FBG Sensors for SHM for Concrete and Timber Structures

Length Effect on the Stress Detection of Prestressed Steel Strands Based on Electromagnetic Oscillation Method

Modelo Teórico de Sensor basado en el Principio de la Reflectometría de Luz sobre Fibra Óptica para Detección de Sobrecarga Vehicular

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