Monitoring of pre-release cracks in prestressed concrete using fiber optic sensors

2015 ◽  
Author(s):  
Hiba Abdel-Jaber ◽  
Branko Glisic
Keyword(s):  
Prestressed Concrete ◽  
Fiber Optic ◽  
Fiber Optic Sensors

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

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1661 ◽  
Author(s):  
Kristýna Čápová ◽  
Lukáš Velebil ◽  
Jan Včelák
Keyword(s):  
Prestressed Concrete ◽  
Fiber Optic ◽  
Analytical Data ◽  
Fiber Optic Sensors ◽  
Transport Infrastructure ◽  
Second Phase ◽  
Loading Tests ◽  
Fbg Sensors ◽  
Prestressed Concrete Bridge

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.

Monitoring of long-term prestress losses in prestressed concrete structures using fiber optic sensors

2018 ◽  
Vol 18 (1) ◽  
pp. 254-269 ◽  
Author(s):  
Hiba Abdel-Jaber ◽  
Branko Glisic
Keyword(s):  
Cross Sections ◽  
Prestressed Concrete ◽  
Fiber Optic ◽  
Concrete Structures ◽  
Fiber Optic Sensors ◽  
Prestress Losses ◽  
Site Assessment ◽  
Princeton University ◽  
Prestressing Force ◽  
Wide Range

This study presents a method for on-site assessment of prestress losses in prestressed concrete structures. The study is motivated by the increased use of prestressed concrete, the importance of prestressing force levels as a parameter, and the lack of formalized methods for its on-site assessment. The proposed method uses strain measurements from long-gauge fiber optic sensors to study strain changes at the centroid of stiffness (i.e. centroid of composite section) of the cross-sections. Its advantages include (1) robustness to operational load on the structure caused by seasonal and daily temperature variations, in addition to loading; (2) rigorous quantification of uncertainties associated with measurements and parameters; and (3) applicability to a wide range of beam-like structures. The application of the method is illustrated through application to measurements collected over a 7-year period from strain sensors embedded in Streicker Bridge, a post-tensioned concrete pedestrian bridge on the Princeton University campus. Application of the method indicates that prestress losses measured by sensors are of comparable magnitude to design estimates, which implies that estimates are not necessarily overly conservative.

Nursing Movement Monitoring System Utilizing Hetero-core Fiber Optic Sensors Embedded in Medical Thin Films

2018 ◽  
Vol 138 (12) ◽  
pp. 525-532
Author(s):  
Masahiko Ito ◽  
Yuya Koyama ◽  
Michiko Nishiyama ◽  
Emi Yanagisawa ◽  
Mariko Hayashi ◽  
...  
Keyword(s):  
Thin Films ◽  
Monitoring System ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Core Fiber ◽  
Movement Monitoring

Embedded Fiber Optic Sensors for Integral Armor

2000 ◽  
Author(s):  
Bruce K. Fink ◽  
Kelli Corona-Bittick
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensors

Erratum to “Angle-Resolved Characterization and Ray-Optics Modeling of Fiber-Optic Sensors”

2021 ◽  
Vol 39 (1) ◽  
pp. 336-336
Author(s):  
George. Y. Chen ◽  
Christophe A. Codemard ◽  
Philip M. Gorman ◽  
Jaclyn S. Chan ◽  
Michalis N. Zervas
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Ray Optics
Sign in / Sign up

Export Citation Format

Share Document