FBG based intelligent monitoring system of the Tianjin Yonghe Bridge

Lan, Chunguang; Zhou, Zhi; Sun, Shouwang; Ou, Jinping

doi:10.1117/12.777267

Cited by 6 publications

(3 citation statements)

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“…The strain and temperature (measured with a bare FBG sensor) are calculated from the variation of the FBG wavelength. 6,7 It is worth noting that the effect of temperature on the strain in the present paper is excluded in the presented values. …”

Section: Strain Monitoringmentioning

confidence: 90%

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In-situ monitoring of curing and ageing effects in FRP plates using embedded FBG sensors

Xian

Wang

2010

SPIE Proceedings

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In recent years, fiber reinforced polymer (FRP) composites have been widely applied in civil engineering for retrofitting or renewal of existing structures. Since FRP composite may degrade when exposed to severe outdoor environments, a serious concern has been raised on its long term durability. In the present study, fiber Bragg grating (FBG) sensors were embedded in glass-, carbon-and basalt-fiber reinforced epoxy based FRP plates with wet lay-up technology, to in-situ monitor the stain changes in FRPs during the curing, and water immersion and freeze-thaw ageing processes. The study demonstrates that the curing of epoxy resin brings in a slight tension strain (e.g., 10 ~ 30 ) along the fiber direction and a high contraction (e.g., ~1100 ) in the direction perpendicular to the fibers, mainly due to the resin shrinkage. The cured FRP strips were then subjected to distilled water immersion at 80 o C and freeze-thaw cycles from -30 o C to 30 o C. Remarkable strain changes of FRPs due to the variation of the temperatures during freeze-thaw cycles indicate the potential property degradation from fatigue. The maximum strain change is dependent on the fiber types and directions to the fiber. Based on the monitored strain values with temperature change and water uptake content, CTE (coefficient of thermal expansion) and CME (coefficient of moisture expansion) are exactly determined for the FRPs.

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Section: Strain Monitoringmentioning

confidence: 90%

“…The monitoring system has 25 channels and has been applied in structural and composite strain monitoring widely. [7][8] The system will record the wavelength of the FBG with time. The strain and temperature (measured with a bare FBG sensor) are calculated from the variation of the FBG wavelength.…”

Section: Strain Monitoringmentioning

confidence: 99%

In-situ monitoring of curing and ageing effects in FRP plates using embedded FBG sensors

Xian

Wang

2010

SPIE Proceedings

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“…For example, 40 FBG strain sensors, 10 FBG temperature sensors, and 96 FBG cable sensors have been successfully installed in Yonghe Bridge in Tianjin City, China. The strain of the main beam, the stress of the prestressed reinforcement and the cables were monitored during bridge load test [26]. Liu and Jiang [27] developed a SHM system for the first cable-stayed bridge across the Yangtze River in China.…”

Section: Monitoring Of Strain and Displacementmentioning

confidence: 99%

Smart Sensing Technologies for Structural Health Monitoring of Civil Engineering Structures

Sun

Staszewski

Swamy

2010

Advances in Civil Engineering

114

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Structural Health Monitoring (SHM) aims to develop automated systems for the continuous monitoring, inspection, and damage detection of structures with minimum labour involvement. The first step to set up a SHM system is to incorporate a level of structural sensing capability that is reliable and possesses long term stability. Smart sensing technologies including the applications of fibre optic sensors, piezoelectric sensors, magnetostrictive sensors and self-diagnosing fibre reinforced composites, possess very important capabilities of monitoring various physical or chemical parameters related to the health and therefore, durable service life of structures. In particular, piezoelectric sensors and magnetorestrictive sensors can serve as both sensors and actuators, which make SHM to be an active monitoring system. Thus, smart sensing technologies are now currently available, and can be utilized to the SHM of civil engineering structures. In this paper, the application of smart materials/sensors for the SHM of civil engineering structures is critically reviewed. The major focus is on the evaluations of laboratory and field studies of smart materials/sensors in civil engineering structures.

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