Measurement of Transfer Length for a Seven-Wire Strandwith FBG Sensors

Lee, Seong-Cheol; Choi, Song-Yi; Shin, Kyung-Joon; Kim, Jae-Min; Lee, Hwan-Woo

doi:10.7734/coseik.2015.28.6.707

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…By encapsulating the FBG sensor inside a seven-wire strand, the effective pre-stress force can be measured during construction and even during the service life of the product. In the literature, it was found that the effective pre-stress force can be accurately measured through FBG sensors, not only when tendons are directly exposed to the air [ 25 , 26 ], but also when tendons are embedded in concrete [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors

Shin

Lee

Kim

et al. 2017

Sensors

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The potential for monitoring the construction of post-tensioned concrete beams and detecting damage to the beams under loading conditions was investigated through an experimental program. First, embedded sensors were investigated that could measure pre-stress from the fabrication process to a failure condition. Four types of sensors were installed on a steel frame, and the applicability and the accuracy of these sensors were tested while pre-stress was applied to a tendon in the steel frame. As a result, a tri-sensor loading plate and a Fiber Bragg Grating (FBG) sensor were selected as possible candidates. With those sensors, two pre-stressed concrete flexural beams were fabricated and tested. The pre-stress of the tendons was monitored during the construction and loading processes. Through the test, it was proven that the variation in thepre-stress had been successfully monitored throughout the construction process. The losses of pre-stress that occurred during a jacking and storage process, even those which occurred inside the concrete, were measured successfully. The results of the loading test showed that tendon stress and strain within the pure span significantly increased, while the stress in areas near the anchors was almost constant. These results prove that FBG sensors installed in a middle section can be used to monitor the strain within, and the damage to pre-stressed concrete beams.

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Section: Introductionmentioning

confidence: 99%

Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors

Shin

Lee

Kim

et al. 2017

Sensors

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Smart Sensing of PSC Girders Using a PC Strand with a Built-in Optical Fiber Sensor

et al. 2021

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This paper presents a multi-functional strand capable of introducing prestressing force in prestressed concrete (PSC) girders and sensing their static and dynamic behavior as well. This innovative strand is developed by replacing the core steel wire of the strand used in PSC structures with a carbon fiber-reinforced polymer (CFRP) wire with a built-in optical Fiber Bragg Grating (FBG) sensor. A full-scale girder specimen was fabricated by applying this multi-function strand to check the possibility of tracking the change of prestressing force at each construction stage. Moreover, dynamic data could be secured during dynamic loading tests without installing accelerometers and made it possible to obtain the natural frequencies of the structure. The results verified the capability to effectively manage the prestressing force in the PSC bridge structure by applying the PC strand with a built-in optical sensor known for its outstanding practicability and durability.

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Damage Detection with FBG Sensors for Pre-Stress Concrete Girders

Lee

Shin

Kim

et al. 2017

KEM

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In this paper, possibility to detect damage on post-tensioned concrete girders was investigated through an experimental program with 6 m long specimens containing smart tendons where FBG (Fiber Bragg Grating) sensors were embedded. Total six specimens were fabricated and tested, and test variables were prestressing tendon’s profile and web thickness. All the specimens were subjected to 3-points loading, and they exhibited shear failure. Through the test, it was observed that tendon strains were successfully measured through FBG sensors regardless of the test variables. It was also observed that tendon strains within the pure span significantly increased while ones nearby the anchors beyond the pure span were constant. When the specimen was cracked, FBG sensors nearby cracks showed relatively drastic increase on tendon strain. Since strain variation along tendons cannot be detected by conventional equipment such as a load-cell, the test results indicated that actual tendon strains can be easily measured with FBG sensors. These results showed that FBG sensors can be useful to check whether prestressed concrete members were significantly damaged. In addition, it is expected that FBG sensors can be helpful on more reasonable maintenance of PSC girders.

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Measurement of Transfer Length for a Seven-Wire Strandwith FBG Sensors

Cited by 5 publications

References 16 publications

Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors

Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors

Smart Sensing of PSC Girders Using a PC Strand with a Built-in Optical Fiber Sensor

Damage Detection with FBG Sensors for Pre-Stress Concrete Girders

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