Full-Scale Prestress Loss Monitoring of Damaged RC Structures Using Distributed Optical Fiber Sensing Technology

Lan, Chunguang; Zhou, Zhi; Ou, Jinping

doi:10.3390/s120505380

Cited by 31 publications

(17 citation statements)

References 31 publications

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“…The safety of these bridges is a great concern of government agencies and general public. Many destructive and nondestructive methods have been used to evaluate bridge fitness for serving the anticipated traffic flow [1][2][3]. In this paper, a model capturing the responses of prestressed bridges and vehicles will be created and later used as a structural health monitoring method for detecting prestress losses.…”

Section: Introductionmentioning

confidence: 99%

Dynamic responses of prestressed bridge and vehicle through bridge–vehicle interaction analysis

Zhong

Yang

Gao

2015

Engineering Structures

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Section: Introductionmentioning

confidence: 99%

Dynamic responses of prestressed bridge and vehicle through bridge–vehicle interaction analysis

Zhong

Yang

Gao

2015

Engineering Structures

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“…Their results measured the strain of the steel bars well into the plastic region and demonstrated that bond properties are much less affected when FBGs were used instead of traditional strain gauges due to the compactness of fiber optic lines . Continuous, distributed fiber optic sensors have also been recently investigated for use in monitoring RC and PC structures . As distributed fiber optic sensors such as Brillouin optical time domain reflectometry (BOTDR) are able to provide information from along the entire length of the fiber cable.…”

Section: Introductionmentioning

confidence: 99%

Inference of bond slip in prestressed tendons in concrete bridge girders

Ren

Labib

et al. 2014

Struct. Control Health Monit.

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Summary Prestressed concrete (PC) bridge girders have extra flexural strength due to embedded prestressing tendons. The level of strength depends on the integrity of the concrete‐tendon bond in pretensioned PC structures, and this bond can be degraded in the presence of an adequately large mechanical force or over time because of accumulated damage. Bond degradation is characterized by the bond slip of the tendon from the host concrete, and in regards to PC structures, bond slip has only been measured from a global perspective. In this paper, a novel method was developed to measure for the first time the local strain of a prestressing tendon during bond slip. Fiber Bragg grating‐based strain sensors were installed directly onto prestressing tendons within a PC girder to provide a local perspective of bond slip as the girder was loaded to failure. Measurement of the local strains in selected tendons, from the beginning of bond slip to the complete loss of the concrete‐tendon bond, and the failure of the girder was enabled by the method. Copyright © 2014 John Wiley & Sons, Ltd.

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“…It would thus be highly desirable to have tools and procedures capable of estimating the actual loss of prestressing. Besides other emerging methods (Bartoli et al 2009;Kim et al 2010;Lan et al 2012), dynamic identification techniques have proved to be economical, quick and reliable in order to evaluate structural integrity (Salawu 1997). Nevertheless, as far as the influence of prestressing on the dynamic properties of PRC elements is concerned, the debate is still on going.…”

Section: Introductionmentioning

confidence: 99%

On the Evaluation of Prestress Loss in PRC Beams by Means of Dynamic Techniques

Breccolotti

2018

Int J Concr Struct Mater

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In the last few decades, prestressing techniques have been used to build very important structures and infrastructures. Since the serviceability and the safety of prestressed reinforced concrete (PRC) elements rely on the effective state of prestressing, development of tools and procedures capable of estimating the effective prestress loss would be very useful. Amongst other techniques, dynamic identification has proved to be an economical, quick and reliable method to evaluate structural integrity. However, the influence of prestressing in the dynamic behavior of PRC elements is not completely clear. In fact, while many references in the literature state that the prestressing force does not affect the frequencies of vibration, almost every experimental test carried out on PRC beams shows an increase in the eigenfrequencies for increasing value of the prestressing force. This paper aims to contribute to the debate, investigating the dynamic behaviour of PRC beams taking into account properties, such as nonlinearity, softening, confinement and micro-cracking of concrete subjected to compression and tension stress states, and the variation of the flexural stiffness of the PRC beam along its length according to bending stress distribution. Non-linear discrete modelling, in combination with system identification and optimization was used to define the dynamic properties of PRC beams, taking into account the effect of prestressing level. The proposed model was applied to four PRC beams with known mechanical and dynamic properties in literature. The influence of the prestressing force on the trend of frequencies of vibration was closely captured for each beam, with errors less than 3% of the estimated frequencies. The results of this investigation thus indicate that dynamic identification techniques can potentially be used to identify the prestressing force level, and consequently the prestress loss, provided the complete concrete mechanics is taken into account.

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Full-Scale Prestress Loss Monitoring of Damaged RC Structures Using Distributed Optical Fiber Sensing Technology

Cited by 31 publications

References 31 publications

Dynamic responses of prestressed bridge and vehicle through bridge–vehicle interaction analysis

Dynamic responses of prestressed bridge and vehicle through bridge–vehicle interaction analysis

Inference of bond slip in prestressed tendons in concrete bridge girders

On the Evaluation of Prestress Loss in PRC Beams by Means of Dynamic Techniques

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