Deformational Behavior of High Performance Concrete Continuous Composite Beams Reinforced with Prestressed Prisms and Instrumented with Bragg Grating Fiber Optic Sensors

10.14359/526 ◽  
1998 ◽  
Vol 95 (1) ◽  
Keyword(s):  
High Performance ◽  
Fiber Optic ◽  
High Performance Concrete ◽  
Composite Beams ◽  
Fiber Optic Sensors ◽  
Bragg Grating ◽  
Deformational Behavior

Fiber Optic Sensing the Behavior of Prestressed-Prism-Reinforced Composite Concrete Beams for Bridge Deck Application

1997 ◽  
Vol 503 ◽  
Author(s):  
Edward G. Nawy ◽  
P. E.
Keyword(s):  
High Performance ◽  
Fiber Optic ◽  
High Performance Concrete ◽  
Fiber Optic Sensors ◽  
Bragg Grating ◽  
Smart Systems ◽  
Service Load ◽  
Deformational Behavior ◽  
On Line ◽  
Concrete Elements

ABSTRACTThis investigation involves the identification and use of a novel type of fiber optic sensors in monitoring the deformation behavior of critical sections of the structural concrete elements and transforming them into smart systems. Basic operating principles of the Bragg-grating sensors identified in this work are proved to be feasible. Deformational behavior was studied of high performance concrete composite beams reinforced with prestressed prisms and instrumented with Bragg Grating fiber optic sensors. The experimental techniques using those sensors for evaluating their behavior at service load stages, and the potential of this technique for on-line, real-time monitoring of existing constructed concrete structures are presented.

Fiber Optic Sensing of Prestressed-Prism-Reinforced Continuous-Composite Concrete Beams for Bridge Deck Application

1997 ◽  
Vol 1574 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Edward G. Nawy ◽  
Benxian Chen
Keyword(s):  
High Performance ◽  
Fiber Optic ◽  
High Performance Concrete ◽  
Fiber Optic Sensor ◽  
Bragg Grating ◽  
Smart Systems ◽  
Service Load ◽  
Negative Moment ◽  
Deformational Behavior ◽  
On Line

This investigation involves the identification and use of a novel type of fiber optic sensor in nondestructive testing and monitoring of the deformation behavior of critical sections of structural concrete elements and transforming them into smart systems. Deformational behavior of high-performance-concrete continuous-composite beams reinforced with prestressed prisms was studied and instrumented using fiber optic Bragg grating sensors. Such elements are useful as components of continuous bridge decks where prevention of cracking in the negative moment regions is essential to maintaining the integrity of a bridge. An experimental technique using Bragg grating sensors to evaluate the behavior of the investigated elements at service load stages and the potential of this technique for on-line, real-time monitoring of existing constructed concrete structures are presented. Four continuous beams 5791 mm (19 ft) long with two equal 2743-mm (9-ft) clear spans were tested to failure. High-performance concrete with compressive strength fc’ in excess of 90 MPa (13,000 psi) was used for both the precast prestressed prisms and the main beams cast in situ. Experimental results were compared with theoretical evaluations obtained from nonlinear analysis. Parametric study was conducted to further identify the primary variables that affected the structural performance of such composite T-sections.

Early-Age Autogenous Shrinkage of High-Performance Concrete Columns by Embedded Fiber Bragg-Grating Sensor

2009 ◽  
Vol 419-420 ◽  
pp. 1-4 ◽  
Author(s):  
Ying Wei Yun ◽  
Ii Young Jang ◽  
Seong Kyum Kim ◽  
Seung Min Park
Keyword(s):  
Fiber Bragg Grating ◽  
High Performance ◽  
High Performance Concrete ◽  
Construction Material ◽  
Autogenous Shrinkage ◽  
Strain Sensor ◽  
Bragg Grating ◽  
Early Age ◽  
Long Time ◽  
Sensor Temperature

High-performance concrete (HPC) as a promising construction material has been widely used in infrastructures and high-rise buildings etc. However, its pretty high autogenous shrinkage (AS) especially in its early age becomes one of the key problems endangering long-time durability of HPC structures. This paper carried out the early age AS research of large scaled HPC column specimens by embedded Fiber Bragg-Grating (FBG) strain sensor. Temperature compensation for FBG strain sensor by thermocouple was also attempted in this paper, and the results were reasonable and acceptable comparing with the result compensated by FBG temperature sensor. Reinforcement influence, size effect and temperature effect on HPC AS were also analyzed respectively in this paper.

Detection of tilted fiber Bragg grating fiber-optic sensors with short-term KLT: towards low-cost biosensors

2018 ◽  
Author(s):  
Madina Shaimerdenova ◽  
Aliya Bekmurzayeva ◽  
Marzhan Sypabekova ◽  
Yntymak Abukhanov ◽  
Daniele Tosi
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Low Cost ◽  
Fiber Optic Sensors ◽  
Bragg Grating ◽  
Short Term

scholarly journals Fiber Bragg grating fabrication by femtosecond laser radiation

2019 ◽  
Vol 220 ◽  
pp. 03007
Author(s):  
Anton Chernikov ◽  
Dmitriy Kochuev ◽  
Kirill Khorkov ◽  
Ruslan Chkalov ◽  
Nikolay Davydov
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Fiber Optic Sensors ◽  
Bragg Grating ◽  
Femtosecond Laser Radiation ◽  
Grating Fabrication

The paper presents the results of fiber Bragg gratings fabrication by femtosecond laser radiation using point-by-point and line-by-line inscription methods. The approach makes it possible to fabricate the second and higher diffraction orders fiber Bragg gratings, which can be used as sensitive elements of fiber-optic sensors.

Testing and Monitoring for a Large Scale Truss Bridge Using Long-Gauge Fiber Optic Sensors

2013 ◽  
Vol 569-570 ◽  
pp. 223-229 ◽  
Author(s):  
Chun Feng Wan ◽  
Wan Hong ◽  
Zhi Shen Wu ◽  
Tadanobu Sato
Keyword(s):  
Damage Detection ◽  
Structural Damage ◽  
Large Scale ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Structural Testing ◽  
Bragg Grating ◽  
Truss Bridges ◽  
Long Span ◽  
Truss Bridge

Fiber optic sensors become very popular for structural testing and monitoring in civil engineering nowadays, due to its advantage of high resolution and environment durability. In this paper, long-gauge fiber optic bragg grating sensors will be introduced. Structural damage detection stratagem using the micro-strain mode will be studied. Then its application to a structural testing and monitoring for a real long span truss bridge will be discussed in detail. In the testing, 23 long-gauge fiber optic bragg grating sensors were deployed on the mid span of the bridge. Testing were made under conditions either there is train on the bridge or no train on it. Corresponding dynamic characteristics were analyzed and discussed. Results of the testing show that long-gauge fiber optic sensors can work well for structural testing and also damage detection for truss bridges.

Laboratory investigation on Fabry-Perot sensor and conventional extensometers for strain measurement in high performance concrete

2000 ◽  
Vol 27 (5) ◽  
pp. 1088-1093 ◽  
Author(s):  
Marco Quirion ◽  
Gérard Ballivy
Keyword(s):  
High Performance ◽  
Fiber Optic ◽  
High Performance Concrete ◽  
Fiber Optic Sensor ◽  
Vibrating Wire ◽  
Thermal Tests ◽  
Optic Sensor ◽  
Wire Strain ◽  
Fabry Perot ◽  
Concrete Cylinders

Advances in fiber optic sensing technology have made possible the installation of an extremely precise and reliable sensor in small structural members. Because of the high sensitivity and fast response of the sensor, low strain and dynamic strain can be measured. In this study, a Fabry-Perot strain sensor was cast in a high performance concrete cylinder, which had been submitted to simple compression and thermal tests. These results were compared with measurements obtained using external linear variable differential transformers fixed on concrete samples having the same composition as the fiber optic instrumented concrete cylinder. Comparisons were also done with results from tests on concrete cylinders instrumented with embedment vibrating wire and electrical strain gauges. In addition, thermal tests were performed on the different concrete cylinders and samples in order to compare the behaviour of the different sensors in high performance concrete submitted to temperature variations. The results show that the concrete strains measured with the Fabry-Perot sensor are in agreement with strain measurements made on concrete samples. Consequently, the presence of the embedded fiber optic sensor does not influence greatly the mechanical properties of concrete. Furthermore, for high stress levels (0.4 f 'c) and rapid stress changes (0.25 MPa/s), the fiber optic sensor measures with higher accuracy the strains of high performance concrete than the vibrating wire strain gauge.Key words: high performance concrete, sensor, vibrating wire, strain, extensometer, Fabry-Perot, fiber optic, instrumentation.

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