Investigation on strengthening and strain sensing techniques for concrete structures using FRP composites and FBG sensors

10.1617/13521 ◽  
2005 ◽  
Vol 34 (235) ◽  
pp. 42-50 ◽  
Author(s):  
K. T. Lau
Keyword(s):  
Concrete Structures ◽  
Strain Sensing ◽  
Frp Composites ◽  
Fbg Sensors

Self-monitoring Properties of Concrete Columns with Embedded Cement-based Strain Sensors

2011 ◽  
Vol 22 (2) ◽  
pp. 191-200 ◽  
Author(s):  
Huigang Xiao ◽  
Hui Li ◽  
Jinping Ou
Keyword(s):  
Cyclic Load ◽  
Failure Modes ◽  
Concrete Structures ◽  
Concrete Columns ◽  
Strain Sensors ◽  
Strain Sensing ◽  
Self Monitoring ◽  
Good Strain ◽  
Displacement Transducers ◽  
Monotonic Load

Cement-based strain sensors (CBCC sensor) were fabricated by taking the advantage of piezoresistivity of CB-filled CBCC. CBCC sensors were centrally embedded into concrete columns (made with C40 and C80 concretes, respectively) to monitor the strain of the columns under cyclic load and monotonic load by measuring the resistance of CBCC sensors. The comparison between the monitored results of CBCC sensors and that of traditional displacement transducers indicates that CBCC sensors have good strain-sensing abilities. Meanwhile, CBCC sensors exhibit different failure modes that break later than C40 concrete columns, but a little earlier than C80 concrete columns. Therefore, the strength-matching principle between embedded CBCC sensors and concrete columns is proposed in this article to guarantee the sensing capacity of CBCC sensors in various concrete structures. The analytical results agree well with the experimental phenomena.

Strain Sensing Properties of Grating Ends Packaged FBG Sensors

2016 ◽  
Vol 45 (2) ◽  
pp. 206004
Author(s):  
吴俊 WU Jun ◽  
陈伟民 CHEN Weimin ◽  
余葵 YU Kui ◽  
马希钦 MA Xiqin ◽  
舒岳阶 SHU Yuejie
Keyword(s):  
Strain Sensing ◽  
Sensing Properties ◽  
Fbg Sensors

Millimeter-resolution distributed strain sensing of concrete structures

2019 ◽  
Author(s):  
Nur Aida Abdul Rahim ◽  
Nicholas Mirabile ◽  
Maurizio Chiani ◽  
Laurent Briancon
Keyword(s):  
Concrete Structures ◽  
Strain Sensing ◽  
Distributed Strain

Structural NDE of concrete structures using protected EFPI and FBG sensors

2006 ◽  
Vol 126 (2) ◽  
pp. 340-347 ◽  
Author(s):  
J.S. Leng ◽  
R.A. Barnes ◽  
A. Hameed ◽  
D. Winter ◽  
J. Tetlow ◽  
...  
Keyword(s):  
Concrete Structures ◽  
Fbg Sensors

scholarly journals FRP REINFORCEMENT FOR CONCRETE STRUCTURES: STATE-OF-THE-ART REVIEW OF APPLICATION AND DESIGN

2014 ◽  
Vol 5 (4) ◽  
pp. 147-158 ◽  
Author(s):  
Eugenijus Gudonis ◽  
Edgaras Timinskas ◽  
Viktor Gribniak ◽  
Gintaris Kaklauskas ◽  
Aleksandr K. Arnautov ◽  
...  
Keyword(s):  
Material Properties ◽  
Structural Engineering ◽  
State Of The Art ◽  
Concrete Structures ◽  
Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Promising Alternative ◽  
Frp Composites ◽  
Structural Problems ◽  
Concrete Elements

Fiber reinforced polymers (FRPs) are considered to be a promising alternative to steel reinforcement, especially in concrete structures subjected to an aggressive environment or to the effects of electromagnetic fields. Although attempts to develop effective reinforcement have been followed, the application of FRPs remains limited by the solution to simple structural problems that mainly appear due to the absence of design codes, significant variation in the material properties of FRP composites and limited knowledge gained by engineers as regards the application aspects of FRP composites and structural mechanics of concrete elements reinforced with FRPs. To fill the latter gap, the current state-of-the-art report is dedicated to present recent achievements in FRPs applying practice to a broad engineers’ community. The report also revises the manufacturing process, material properties, the application area and design peculiarities of concrete elements reinforced with FRP composites. Along the focus on internal reinforcement, the paper overviews recent practices of applying FRP reinforced concrete (RC) elements in structural engineering. The review highlights the main problems restricting the application of FRPs in building industry and reveals the problematic issues (related to the material properties of the FRP) important for designing RC following the formulation of targets for further research.

scholarly journals Crack Detection of Reinforced Concrete Structures Based on BOFDA and FBG Sensors

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Qinghua Zhang ◽  
Ziming Xiong
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Crack Detection ◽  
Concrete Structures ◽  
Lower Surface ◽  
Reinforced Concrete Beam ◽  
Sensor Data ◽  
Reinforced Concrete Structures ◽  
Surface Cracks ◽  
Fbg Sensors

Reinforced concrete structural elements, as an important component of buildings and structures, require inspection for the purposes of crack detection which is an important part of structural health monitoring. Now existing crack detection methods usually use a single technology and can only detect internal or external cracks. In this paper, the authors propose a new sensing system combining BOFDA (Brillouin optical frequency-domain analysis) and FBG (fiber Bragg grating) technology, which are used to detect internal and surface cracks and their development in reinforced concrete structures, and an attempt is made to estimate the width of surface cracks. In these experiments, a special reinforced concrete beam structure was designed by the author for crack detection under load. Four continuous distributed optical fibers are fixed on the steel skeleton, which is located within the reinforced concrete beam. Three FBG sensors are fixed on the lower surface of the beam, near its centre. By analysing the sensor data, it can be found that the BOFDA-distributed fiber can be used to detect internal cracking before surface cracking, and the difference between scans can be used to judge the time of onset of internal cracking, but the relative error in position is about 5%, while the FBG sensor can detect the cracking time of microcracks on the lower surface in near-real-time and can be used to calculate the crack width. Through the experiment, it is found that if the combination of BOFDA and FBG technology is adopted, we can initially use the strain data obtained by multiple groups of BOFDA monitoring to predict the general location of the internal cracks, then to monitor the exact location of the surface cracks by FBG in the medium term, and to estimate the width of the final expansion of the cracks finally.

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